Questions & Help>Questions

Parsing nested JSON

#poison#httpoison#jason
Maxximiliann

Maxximiliann

(Please Note: Elixir Experience Level: Beginner)

From mix.exs-

defp deps do
    [
      	{:httpoison, "~> 1.6"},
	{:poison, "~> 4.0"}
    ]
  end


In IEX - 

iex(2)> res = HTTPoison.get! ("https://api.wavesplatform.com/v0/pairs")

%HTTPoison.Response{
 body: "{\"__type\":\"list\",\"data\":[{\"__type\":\"pair\",\"data\":{\"firstPrice\":0.22605,\"lastPrice\":0.183,\"low\":0.182,\"high\":0.22605,\"weightedAveragePrice\":0.199292871612085,\"volume\":732311.857444342,\"quoteVolume\":145944.532985663,\"volumeWaves\":145944.532985663,\"txsCount\":2974},\"amountAsset\":\"4LHHvYGNKJUg5hj65aGD5vgScvCBmLpdRFtjokvCjSL8\",\"priceAsset\":\"WAVES\"},{\"__type\":\"pair\",\"data\":{\"firstPrice\":0.00010967,\"lastPrice\":0.00011121,\"low\":0.0001078,\"high\":0.000113,\"weightedAveragePrice\":0.000111679201769491,\"volume\":138114.26699538,\"quoteVolume\":15.4244910910224,\"volumeWaves\":138114.26699538,\"txsCount\":2192},\"amountAsset\":\"WAVES\",\"priceAsset\":\"8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS\"},{\"__type\":\"pair\",\"data\":{\"firstPrice\":8360,\"lastPrice\":8630.71,\"low\":8183,\"high\":8666,\"weightedAveragePrice\":8322.46563502579,\"volume\":8.95597220000001,\"quoteVolume\":74535.7708627464,\"volumeWaves\":78239.1291224059,\"txsCount\":267},\"amountAsset\":\"8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS\",\"priceAsset\":\"Ft8X1v1LTa1ABafufpaCWyVj8KkaxUWE6xBhW6sNFJck\"},{\"__type\":\"pair\",\"data\":{\"firstPrice\":196.16698506,\"lastPrice\":197.61817326,\"low\":191.9827021,\"high\":198.35016891,\"weightedAveragePrice\":194.200358923929,\"volume\":306.50228458,\"quoteVolume\":59522.8536764403,\"volumeWaves\":59522.8536764403,\"txsCount\":1083},\"amountAsset\":\"474jTeYx2r2Va35794tCScAXWJG9hU2HcgxzMowaZUnu\",\"priceAsset\":\"WAVES\"},{\"__type\":\"pair\",\"data\":{\"firstPrice\":0.00001699,\"lastPrice\":0.00002001,\"low\":0.000012,\"high\":0.000037,\"weightedAveragePrice\":0.0000182454824214892,\"volume\":2569761604.661,\"quoteVolume\":46886.54018526,\"volumeWaves\":46886.54018526,\"txsCount\":60},\"amountAsset\":\"7x5Efh41w4k2Q2ikxHQtAa9uR91qnmGQMVkqcb2SPfde\",\"priceAsset\":\"WAVES\"},{\"__type\":\"pair\",\"data\":{\"firstPrice\":0.02134005,\"lastPrice\":0.02198548,\"low\":0.02134005,\"high\":0.0220278,\"weightedAveragePrice\":0.0217290690497021,\"volume\":185.14934025,\"quoteVolume\":4.02312279879904,\"volumeWaves\":36023.9215096012,\"txsCount\":549},\"amountAsset\":\"474jTeYx2r2Va35794tCScAXWJG9hU2HcgxzMowaZUnu\",\"priceAsset\":\"8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS\"},{\"__type\":\"pair\",\"data\":{\"firstPrice\":0.99,\"lastPrice\":0.99999999,\"low\":0.99,\"high\":1,\"weightedAveragePrice\":0.998652039818104,\"volume\":52032.18850477,\"quoteVolume\":51962.0511864887,\"volumeWaves\":31260.1893633205,\"txsCount\":30},\"amountAsset\":\"725Yv9oceWsB4GsYwyy4A52kEwyVrL5avubkeChSnL46\",\"priceAsset\":\"5dJj4Hn9t2Ve3tRpNGirUHy4yBK6qdJRAJYV21yPPuGz\"},{\"__type\":\"pair\",\"data\":{\"firstPrice\":0.91,\"lastPrice\":0.96,\"low\":0.91,\"high\":0.97,\"weightedAveragePrice\":0.952666162044499,\"volume\":20147.36196732,\"quoteVolume\":19193.7100007281,\"volumeWaves\":20147.36196732,\"txsCount\":272},\"amountAsset\":\"WAVES\",\"priceAsset\":\"Ft8X1v1LTa1ABafufpaCWyVj8KkaxUWE6xBhW6sNFJck\"},{\"__type\":\"pair\",\"data\":{\"firstPrice\":1.00999999,\"lastPrice\":0.11999999,\"low\":0.11999999,\"high\":1.11,\"weightedAveragePrice\":1.03881808932202,\"volume\":15639.51718921,\"quoteVolume\":16246.613364414,\"volumeWaves\":16246.613364414,\"txsCount\":34},\"amountAsset\":\"3k6vM987VAEVKJdD1J9eaXB2qi48Q7iYTEct7g9DMmtv\",\"priceAsset\":\"WAVES\"},{\"__type\":\"pair\",\"data\":{\"firstPrice\":1500,\"lastPrice\":1500,\"low\":1500,\"high\":1501,\"weightedAveragePrice\":1500.01449275362,\"volume\":69,\"quoteVolume\":103501,\"volumeWaves\":14951.0923323936,\"txsCount\":69},\"amountAsset\":\"DHgwrRvVyqJsepd32YbBqUeDH4GJ1N984X8QoekjgH8J\",\"priceAsset\":\"7zoGYmqorrybHZRtrykZeshHtia176fzTuwdQq6bAjw2\"},{\"__type\":\"pair\",\"data\":{\"firstPrice\":0.00002419,\"lastPrice\":0.00002046,\"low\":0.00002002,\"high\":0.00002464,\"weightedAveragePrice\":0.0000225360286772358,\"volume\":70983.3606095201,\"quoteVolume\":1.59968305030272,\"volumeWaves\":14323.9119277062,\"txsCount\":3268},\"amountAsset\":\"4LHHvYGNKJUg5hj65aGD5vgScvCBmLpdRFtjokvCjSL8\",\"priceAsset\":\"8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS\"},{\"__type\":\"pair\",\"data\":{\"firstPrice\":0.14638502,\"lastPrice\":0.14500003,\"low\":0.1395,\"high\":0.14967,\"weightedAveragePrice\":0.144453602693632,\"volume\":89246.9499999998,\"quoteVolume\":12892.0434569184,\"volumeWaves\":12892.0434569184,\"txsCount\":2795},\"amountAsset\":\"DHgwrRvVyqJsepd32YbBqUeDH4GJ1N984X8QoekjgH8J\",\"priceAsset\":\"WAVES\"},{\"__type\":\"pair\"," <> ...,
  headers: [
    {"Date", "Mon, 07 Oct 2019 20:06:35 GMT"},
    {"Content-Type", "application/json; charset=utf-8"},
    {"Transfer-Encoding", "chunked"},
    {"Connection", "keep-alive"},
    {"Set-Cookie",
     "__cfduid=d9231e750fe82d310888154f4f764b65f1570478794; expires=Tue, 06-Oct-20 20:06:34 GMT; path=/; domain=.wavesplatform.com; HttpOnly"},
    {"Vary", "Accept-Encoding"},
    {"X-Request-Id", "cb1c8ff5-5c32-4248-b05b-c5c718b66bf4"},
    {"Vary", "Origin"},
    {"X-Cache-Status", "EXPIRED"},
    {"Access-Control-Allow-Origin", "*"},
    {"Access-Control-Allow-Credentials", "true"},
    {"Access-Control-Allow-Methods", "PUT, GET, POST, OPTIONS"},
    {"Access-Control-Allow-Headers",
     "DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Authorization"},
    {"Strict-Transport-Security", "max-age=15724800; includeSubDomains"},
    {"CF-Cache-Status", "DYNAMIC"},
    {"Expect-CT",
     "max-age=604800, report-uri=\"https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct\""},
    {"Server", "cloudflare"},
    {"CF-RAY", "52227f12cf6dc7bd-DEN"}
  ],
  request: %HTTPoison.Request{
    body: "",
    headers: [],
    method: :get,
    options: [],
    params: %{},
    url: "https://api.wavesplatform.com/v0/pairs"
  },
  request_url: "https://api.wavesplatform.com/v0/pairs",
  status_code: 200
}

iex(3)> res.body

"{\"__type\":\"list\",\"data\":[{\"__type\":\"pair\",\"data\":{\"firstPrice\":0.22605,\"lastPrice\":0.183,\"low\":0.182,\"high\":0.22605,\"weightedAveragePrice\":0.199292871612085,\"volume\":732311.857444342,\"quoteVolume\":145944.532985663,\"volumeWaves\":145944.532985663,\"txsCount\":2974},\"amountAsset\":\"4LHHvYGNKJUg5hj65aGD5vgScvCBmLpdRFtjokvCjSL8\",\"priceAsset\":\"WAVES\"},{\"__type\":\"pair\",\"data\":{\"firstPrice\":0.00010967,\"lastPrice\":0.00011121,\"low\":0.0001078,\"high\":0.000113,\"weightedAveragePrice\":0.000111679201769491,\"volume\":138114.26699538,\"quoteVolume\":15.4244910910224,\"volumeWaves\":138114.26699538,\"txsCount\":2192},\"amountAsset\":\"WAVES\",\"priceAsset\":\"8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS\"},{\"__type\":\"pair\",\"data\":{\"firstPrice\":8360,\"lastPrice\":8630.71,\"low\":8183,\"high\":8666,\"weightedAveragePrice\":8322.46563502579,\"volume\":8.95597220000001,\"quoteVolume\":74535.7708627464,\"volumeWaves\":78239.1291224059,\"txsCount\":267},\"amountAsset\":\"8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS\",\"priceAsset\":\"Ft8X1v1LTa1ABafufpaCWyVj8KkaxUWE6xBhW6sNFJck\"},{\"__type\":\"pair\",\"data\":{\"firstPrice\":196.16698506,\"lastPrice\":197.61817326,\"low\":191.9827021,\"high\":198.35016891,\"weightedAveragePrice\":194.200358923929,\"volume\":306.50228458,\"quoteVolume\":59522.8536764403,\"volumeWaves\":59522.8536764403,\"txsCount\":1083},\"amountAsset\":\"474jTeYx2r2Va35794tCScAXWJG9hU2HcgxzMowaZUnu\",\"priceAsset\":\"WAVES\"},{\"__type\":\"pair\",\"data\":{\"firstPrice\":0.00001699,\"lastPrice\":0.00002001,\"low\":0.000012,\"high\":0.000037,\"weightedAveragePrice\":0.0000182454824214892,\"volume\":2569761604.661,\"quoteVolume\":46886.54018526,\"volumeWaves\":46886.54018526,\"txsCount\":60},\"amountAsset\":\"7x5Efh41w4k2Q2ikxHQtAa9uR91qnmGQMVkqcb2SPfde\",\"priceAsset\":\"WAVES\"},{\"__type\":\"pair\",\"data\":{\"firstPrice\":0.02134005,\"lastPrice\":0.02198548,\"low\":0.02134005,\"high\":0.0220278,\"weightedAveragePrice\":0.0217290690497021,\"volume\":185.14934025,\"quoteVolume\":4.02312279879904,\"volumeWaves\":36023.9215096012,\"txsCount\":549},\"amountAsset\":\"474jTeYx2r2Va35794tCScAXWJG9hU2HcgxzMowaZUnu\",\"priceAsset\":\"8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS\"},{\"__type\":\"pair\",\"data\":{\"firstPrice\":0.99,\"lastPrice\":0.99999999,\"low\":0.99,\"high\":1,\"weightedAveragePrice\":0.998652039818104,\"volume\":52032.18850477,\"quoteVolume\":51962.0511864887,\"volumeWaves\":31260.1893633205,\"txsCount\":30},\"amountAsset\":\"725Yv9oceWsB4GsYwyy4A52kEwyVrL5avubkeChSnL46\",\"priceAsset\":\"5dJj4Hn9t2Ve3tRpNGirUHy4yBK6qdJRAJYV21yPPuGz\"},{\"__type\":\"pair\",\"data\":{\"firstPrice\":0.91,\"lastPrice\":0.96,\"low\":0.91,\"high\":0.97,\"weightedAveragePrice\":0.952666162044499,\"volume\":20147.36196732,\"quoteVolume\":19193.7100007281,\"volumeWaves\":20147.36196732,\"txsCount\":272},\"amountAsset\":\"WAVES\",\"priceAsset\":\"Ft8X1v1LTa1ABafufpaCWyVj8KkaxUWE6xBhW6sNFJck\"},{\"__type\":\"pair\",\"data\":{\"firstPrice\":1.00999999,\"lastPrice\":0.11999999,\"low\":0.11999999,\"high\":1.11,\"weightedAveragePrice\":1.03881808932202,\"volume\":15639.51718921,\"quoteVolume\":16246.613364414,\"volumeWaves\":16246.613364414,\"txsCount\":34},\"amountAsset\":\"3k6vM987VAEVKJdD1J9eaXB2qi48Q7iYTEct7g9DMmtv\",\"priceAsset\":\"WAVES\"},{\"__type\":\"pair\",\"data\":{\"firstPrice\":1500,\"lastPrice\":1500,\"low\":1500,\"high\":1501,\"weightedAveragePrice\":1500.01449275362,\"volume\":69,\"quoteVolume\":103501,\"volumeWaves\":14951.0923323936,\"txsCount\":69},\"amountAsset\":\"DHgwrRvVyqJsepd32YbBqUeDH4GJ1N984X8QoekjgH8J\",\"priceAsset\":\"7zoGYmqorrybHZRtrykZeshHtia176fzTuwdQq6bAjw2\"},{\"__type\":\"pair\",\"data\":{\"firstPrice\":0.00002419,\"lastPrice\":0.00002046,\"low\":0.00002002,\"high\":0.00002464,\"weightedAveragePrice\":0.0000225360286772358,\"volume\":70983.3606095201,\"quoteVolume\":1.59968305030272,\"volumeWaves\":14323.9119277062,\"txsCount\":3268},\"amountAsset\":\"4LHHvYGNKJUg5hj65aGD5vgScvCBmLpdRFtjokvCjSL8\",\"priceAsset\":\"8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS\"},{\"__type\":\"pair\",\"data\":{\"firstPrice\":0.14638502,\"lastPrice\":0.14500003,\"low\":0.1395,\"high\":0.14967,\"weightedAveragePrice\":0.144453602693632,\"volume\":89246.9499999998,\"quoteVolume\":12892.0434569184,\"volumeWaves\":12892.0434569184,\"txsCount\":2795},\"amountAsset\":\"DHgwrRvVyqJsepd32YbBqUeDH4GJ1N984X8QoekjgH8J\",\"priceAsset\":\"WAVES\"},{\"__type\":\"pair\"," <> ...

iex(4)> body = Poison.decode! res.body, keys: :atoms

%{
  __type: "list",
  data: [
    %{
      __type: "pair",
      amountAsset: "4LHHvYGNKJUg5hj65aGD5vgScvCBmLpdRFtjokvCjSL8",
      data: %{
        firstPrice: 0.22605,
        high: 0.22605,
        lastPrice: 0.183,
        low: 0.182,
        quoteVolume: 145944.532985663,
        txsCount: 2974,
        volume: 732311.857444342,
        volumeWaves: 145944.532985663,
        weightedAveragePrice: 0.199292871612085
      },
      priceAsset: "WAVES"
    },
    %{
      __type: "pair",
      amountAsset: "WAVES", 
      data: %{
        firstPrice: 1.0967e-4,
        high: 1.13e-4,
        lastPrice: 1.1121e-4,
        low: 1.078e-4,
        quoteVolume: 15.4244910910224,
        txsCount: 2192,
        volume: 138114.26699538,
        volumeWaves: 138114.26699538,
        weightedAveragePrice: 1.11679201769491e-4
      },
      priceAsset: "8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS"
    },
    %{
      __type: "pair",
      amountAsset: "8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS",
      data: %{
        firstPrice: 8360,
        high: 8666,
        lastPrice: 8630.71,
        low: 8183,
        quoteVolume: 74535.7708627464,
        txsCount: 267,
        volume: 8.95597220000001,
        volumeWaves: 78239.1291224059,
        weightedAveragePrice: 8322.46563502579
      },
      priceAsset: "Ft8X1v1LTa1ABafufpaCWyVj8KkaxUWE6xBhW6sNFJck"
    },
    %{
      __type: "pair",
      amountAsset: "474jTeYx2r2Va35794tCScAXWJG9hU2HcgxzMowaZUnu",
      data: %{
        firstPrice: 196.16698506,
        high: 198.35016891,
        lastPrice: 197.61817326,
        low: 191.9827021,
        quoteVolume: 59522.8536764403,
        txsCount: 1083,
        volume: 306.50228458,
        volumeWaves: 59522.8536764403,
        weightedAveragePrice: 194.200358923929
      },
      priceAsset: "WAVES"
    },
    %{
      __type: "pair",
      amountAsset: "7x5Efh41w4k2Q2ikxHQtAa9uR91qnmGQMVkqcb2SPfde",
      data: %{
        firstPrice: 1.699e-5,
        high: 3.7e-5,
        lastPrice: 2.001e-5,
        low: 1.2e-5,
        quoteVolume: 46886.54018526,
        txsCount: 60,
        volume: 2569761604.661,
        volumeWaves: 46886.54018526,
        weightedAveragePrice: 1.82454824214892e-5
      },
      priceAsset: "WAVES"
    },
    %{
      __type: "pair",
      amountAsset: "474jTeYx2r2Va35794tCScAXWJG9hU2HcgxzMowaZUnu",
      data: %{
        firstPrice: 0.02134005,
        high: 0.0220278,
        lastPrice: 0.02198548,
        low: 0.02134005,
        quoteVolume: 4.02312279879904,
        txsCount: 549,
        volume: 185.14934025,
        volumeWaves: 36023.9215096012,
        weightedAveragePrice: 0.0217290690497021
      },
      priceAsset: "8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS"
    },
    %{
      __type: "pair",
      amountAsset: "725Yv9oceWsB4GsYwyy4A52kEwyVrL5avubkeChSnL46",
      data: %{
        firstPrice: 0.99,
        high: 1,
        lastPrice: 0.99999999,
        low: 0.99,
        quoteVolume: 51962.0511864887,
        txsCount: 30,
        volume: 52032.18850477,
        volumeWaves: 31260.1893633205,
        weightedAveragePrice: 0.998652039818104
      },
      priceAsset: "5dJj4Hn9t2Ve3tRpNGirUHy4yBK6qdJRAJYV21yPPuGz"
    },
    %{
      __type: "pair",
      amountAsset: "WAVES",
      data: %{
        firstPrice: 0.91,
        high: 0.97,
        lastPrice: 0.96,
        low: 0.91,
        quoteVolume: 19193.7100007281,
        txsCount: 272,
        volume: 20147.36196732,
        volumeWaves: 20147.36196732,
        weightedAveragePrice: 0.952666162044499
      },
      priceAsset: "Ft8X1v1LTa1ABafufpaCWyVj8KkaxUWE6xBhW6sNFJck"
    },
    %{
      __type: "pair",
      amountAsset: "3k6vM987VAEVKJdD1J9eaXB2qi48Q7iYTEct7g9DMmtv",
      data: %{
        firstPrice: 1.00999999,
        high: 1.11,
        lastPrice: 0.11999999,
        low: 0.11999999,
        quoteVolume: 16246.613364414,
        txsCount: 34,
        volume: 15639.51718921,
        volumeWaves: 16246.613364414,
        weightedAveragePrice: 1.03881808932202
      },
      priceAsset: "WAVES"
    },
    %{
      __type: "pair",
      amountAsset: "DHgwrRvVyqJsepd32YbBqUeDH4GJ1N984X8QoekjgH8J",
      data: %{
        firstPrice: 1500,
        high: 1501,
        lastPrice: 1500,
        low: 1500,
        quoteVolume: 103501,
        txsCount: 69,
        volume: 69,
        volumeWaves: 14951.0923323936,
        weightedAveragePrice: 1500.01449275362
      },
      priceAsset: "7zoGYmqorrybHZRtrykZeshHtia176fzTuwdQq6bAjw2"
    },
    %{
      __type: "pair",
      amountAsset: "4LHHvYGNKJUg5hj65aGD5vgScvCBmLpdRFtjokvCjSL8",
      data: %{
        firstPrice: 2.419e-5,
        high: 2.464e-5,
        lastPrice: 2.046e-5,
        low: 2.002e-5,
        quoteVolume: 1.59968305030272,
        txsCount: 3268,
        volume: 70983.3606095201,
        volumeWaves: 14323.9119277062,
        weightedAveragePrice: 2.25360286772358e-5
      },
      priceAsset: "8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS"
    },
    %{
      __type: "pair",
      amountAsset: "DHgwrRvVyqJsepd32YbBqUeDH4GJ1N984X8QoekjgH8J",
      data: %{
        firstPrice: 0.14638502,
        high: 0.14967,
        lastPrice: 0.14500003,
        low: 0.1395,
        quoteVolume: 12892.0434569184,
        txsCount: 2795,
        volume: 89246.9499999998,
        volumeWaves: 12892.0434569184,
        weightedAveragePrice: 0.144453602693632
      },
      priceAsset: "WAVES"
    },
    %{
      __type: "pair",
      amountAsset: "3QvxP6YFBKpWJSMAfYtL8Niv8KmmKsnpb9uQwQpg8QN2",
      data: %{
        firstPrice: 0.14161615,
        high: 0.18650499,
        lastPrice: 0.13733208,
        low: 0.10000005,
        quoteVolume: 9284.31574452678,
        txsCount: 5674,
        volume: 71306.6199999999,
        volumeWaves: 9284.31574452678,
        weightedAveragePrice: 0.13020271812809
      },
      priceAsset: "WAVES"
    },
    %{
      __type: "pair",
      amountAsset: "WAVES",
      data: %{ 
        firstPrice: 0.86,
        high: 0.89,
        lastPrice: 0.89,
        low: 0.86,
        quoteVolume: 6152.0900002064,
        txsCount: 74,
        volume: 6965.50440782,
        volumeWaves: 6965.50440782,
        weightedAveragePrice: 0.883222468899682
      },
      priceAsset: "Gtb1WRznfchDnTh37ezoDTJ4wcoKaRsKqKjJjy7nm2zU"
    },
    %{
      __type: "pair",
      amountAsset: "5WvPKSJXzVE2orvbkJ8wsQmmQKqTv9sGBPksV4adViw3",
      data: %{
        firstPrice: 0.00695209,
        high: 0.00701179,
        lastPrice: 0.00692253,
        low: 0.0069058,
        quoteVolume: 0.744231823127807,
        txsCount: 91,
        volume: 106.91282378,
        volumeWaves: 6664.01452854153,
        weightedAveragePrice: 0.00696110903084227
      },
      priceAsset: "8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS"
    },
    %{
      __type: "pair",
      amountAsset: "7uncmN7dZfV3fYVvNdYTngrrbamPYMgwpDnYG1bGy6nA",
      data: %{
        firstPrice: 6.5e-7,
        high: 1.45e-6,
        lastPrice: 4.5e-7,
        low: 4.0e-7,
        quoteVolume: 6443.91190275,
        txsCount: 65,
        volume: 10168871041,
        volumeWaves: 6443.91190275,
        weightedAveragePrice: 6.3369000125665e-7
      },
      priceAsset: "WAVES"
    },
    %{
      __type: "pair",
      amountAsset: "8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS",
      data: %{
        firstPrice: 7598.19,
        high: 7990.56,
        lastPrice: 7970,
        low: 7350.47,
        quoteVolume: 3931.341608943,
        txsCount: 50,
        volume: 0.52597517,
        volumeWaves: 4451.13405441402,
        weightedAveragePrice: 7474.38630789929
      },
      priceAsset: "Gtb1WRznfchDnTh37ezoDTJ4wcoKaRsKqKjJjy7nm2zU"
    },
    %{
      __type: "pair",
      amountAsset: "HZk1mbfuJpmxU1Fs4AX5MWLVYtctsNcg6e2C6VKqK8zk",
      data: %{
        firstPrice: 62.79331273,
        high: 64,
        lastPrice: 63.29769846,
        low: 61.50326477,
        quoteVolume: 3998.40475546229,
        txsCount: 173,
        volume: 63.91732683,
        volumeWaves: 3998.40475546229,
        weightedAveragePrice: 62.5558820082822
      },
      priceAsset: "WAVES"
    },
    %{
      __type: "pair",
      amountAsset: "EYz8Zvs62D4d7F5ZgXHCWuzuFaZg63FYnfVQrTWQoLSK",
      data: %{
        firstPrice: 0.576495,
        high: 0.5825,
        lastPrice: 0.57099225,
        low: 0.5707614,
        quoteVolume: 3174.90322621713,
        txsCount: 524,
        volume: 5506.2269,
        volumeWaves: 3174.90322621713,
        weightedAveragePrice: 0.576602323855765
      },
      priceAsset: "WAVES"
    },
    %{
      __type: "pair",
      amountAsset: "B3uGHFRpSUuGEDWjqB9LWWxafQj8VTvpMucEyoxzws5H",
      data: %{
        firstPrice: 0.00868693,
        high: 0.00884691,
        lastPrice: 0.00869817,
        low: 0.00866753,
        quoteVolume: 0.34547501345214,
        txsCount: 95,
        volume: 39.60940106,
        volumeWaves: 3093.45883547065,
        weightedAveragePrice: 0.00872204588321892
      },
      priceAsset: "8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS"
    },
    %{
      __type: "pair",
      amountAsset: "GSFvcF6ycBfXwPJLLKMExRsHWnvVdZQFHtGiYu4A2kZP",
      data: %{
        firstPrice: 16,
        high: 17,
        lastPrice: 17,
        low: 16,
        quoteVolume: 24800,
        txsCount: 2,
        volume: 1500,
        volumeWaves: 2864.4,
        weightedAveragePrice: 16.5333333333333
      },
      priceAsset: "5f1txDysSx2fVDjgXMdNpuprpdgXKjoHPtebL3SrMGzE"
    },
    %{
      __type: "pair",
      amountAsset: "GSFvcF6ycBfXwPJLLKMExRsHWnvVdZQFHtGiYu4A2kZP",
      data: %{
        firstPrice: 9.3,
        high: 9.4,
        lastPrice: 9.4,
        low: 9.3,
        quoteVolume: 22577.5,
        txsCount: 2,
        volume: 2425,
        volumeWaves: 2607.70125,
        weightedAveragePrice: 9.31030927835052
      },
      priceAsset: "FP2rjWYBQfqBpdLCDBaZvCtzikMozEyDbxsKyaWA76oB"
    },
    %{
      __type: "pair",
      amountAsset: "474jTeYx2r2Va35794tCScAXWJG9hU2HcgxzMowaZUnu",
      data: %{
        firstPrice: 180,
        high: 189,
        lastPrice: 189,
        low: 180,
        quoteVolume: 2449.820040127,
        txsCount: 44,
        volume: 13.15984533,
        volumeWaves: 2571.54094239003,
        weightedAveragePrice: 186.158725934433
      },
      priceAsset: "Ft8X1v1LTa1ABafufpaCWyVj8KkaxUWE6xBhW6sNFJck"
    },
    %{
      __type: "pair",
      amountAsset: "EYz8Zvs62D4d7F5ZgXHCWuzuFaZg63FYnfVQrTWQoLSK",
      data: %{
        firstPrice: 6.299e-5,
        high: 6.56e-5,
        lastPrice: 6.439e-5,
        low: 6.264e-5,
        quoteVolume: 0.263133663575,
        txsCount: 132,
        volume: 4088.603,
        volumeWaves: 2356.15637832115,
        weightedAveragePrice: 6.43578414375277e-5
      },
      priceAsset: "8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS"
    },
    %{
      __type: "pair",
      amountAsset: "HZk1mbfuJpmxU1Fs4AX5MWLVYtctsNcg6e2C6VKqK8zk",
      data: %{
        firstPrice: 0.00684655,
        high: 0.00709932,
        lastPrice: 0.00709932,
        low: 0.00684655,
        quoteVolume: 0.200204842927297,
        txsCount: 81,
        volume: 28.7176871,
        volumeWaves: 1792.67795395356,
        weightedAveragePrice: 0.00697148214722687
      },
      priceAsset: "8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS"
    },
    %{
      __type: "pair",
      amountAsset: "BrjUWjndUanm5VsJkbUip8VRYy6LWJePtxya3FNv4TQa",
      data: %{
        firstPrice: 0.00450193,
        high: 0.00462602,
        lastPrice: 0.00459854,
        low: 0.00449978,
        quoteVolume: 0.162220171380536,
        txsCount: 59,
        volume: 35.38505513,
        volumeWaves: 1452.55489661686,
        weightedAveragePrice: 0.00458442613087815
      },
      priceAsset: "8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS"
    },
    %{
      __type: "pair",
      amountAsset: "zMFqXuoyrn5w17PFurTqxB7GsS71fp9dfk6XFwxbPCy",
      data: %{
        firstPrice: 0.0246938,
        high: 0.0289,
        lastPrice: 0.02863482,
        low: 0.0246938,
        quoteVolume: 0.114129001132226,
        txsCount: 79,
        volume: 3.9819744,
        volumeWaves: 1021.93603933337,
        weightedAveragePrice: 0.028661410061357
      },
      priceAsset: "8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS"
    },
    %{
      __type: "pair",
      amountAsset: "5b3UGNZXX5srkHUQWnEWEiaVtnNWmg5aLo5uZMdjWupH",
      data: %{
        firstPrice: 63.505,
        high: 63.505,
        lastPrice: 63.505,
        low: 63.505,
        quoteVolume: 930.52504855505,
        txsCount: 20,
        volume: 14.65278401,
        volumeWaves: 930.52504855505,
        weightedAveragePrice: 63.505
      },
      priceAsset: "WAVES"
    },
    %{
      __type: "pair",
      amountAsset: "4uK8i4ThRGbehENwa6MxyLtxAjAo1Rj9fduborGExarC",
      data: %{
        firstPrice: 0.01,
        high: 0.0123999,
        lastPrice: 0.00995306,
        low: 0.00983301,
        quoteVolume: 772.4827540199,
        txsCount: 158,
        volume: 76900.97,
        volumeWaves: 772.4827540199,
        weightedAveragePrice: 0.0100451626815618
      },
      priceAsset: "WAVES"
    },
    %{
      __type: "pair",
      amountAsset: "B3uGHFRpSUuGEDWjqB9LWWxafQj8VTvpMucEyoxzws5H",
      data: %{
        firstPrice: 79.43395902,
        high: 79.91894041,
        lastPrice: 78.06775212,
        low: 77.68111011,
        quoteVolume: 757.46507706448,
        txsCount: 75,
        volume: 9.63988277,
        volumeWaves: 757.46507706448,
        weightedAveragePrice: 78.5761710113079
      },
      priceAsset: "WAVES"
    },
    %{
      __type: "pair",
      amountAsset: "5dJj4Hn9t2Ve3tRpNGirUHy4yBK6qdJRAJYV21yPPuGz",
      data: %{
        firstPrice: 9.199e-5,
        high: 9.2e-5,
        lastPrice: 6.509e-5,
        low: 5.807e-5,
        quoteVolume: 0.0826308301517678,
        txsCount: 492,
        volume: 1249.20731894,
        volumeWaves: 739.894526845925,
        weightedAveragePrice: 6.61466106537731e-5
      },
      priceAsset: "8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS"
    },
    %{
      __type: "pair",
      amountAsset: "zMFqXuoyrn5w17PFurTqxB7GsS71fp9dfk6XFwxbPCy",
      data: %{
        firstPrice: 252.12162161,
        high: 260.06813169,
        lastPrice: 256.62477782,
        low: 250.81545975,
        quoteVolume: 683.076959826616,
        txsCount: 70,
        volume: 2.66364912,
        volumeWaves: 683.076959826616,
        weightedAveragePrice: 256.44404688956
      },
      priceAsset: "WAVES"
    },
    %{
      __type: "pair",
      amountAsset: "BrjUWjndUanm5VsJkbUip8VRYy6LWJePtxya3FNv4TQa",
      data: %{
        firstPrice: 41.14304029,
        high: 41.4438984,
        lastPrice: 41.23528168,
        low: 40.45042107,
        quoteVolume: 625.035763618644,
        txsCount: 58,
        volume: 15.21948921,
        volumeWaves: 625.035763618644,
        weightedAveragePrice: 41.068117004082
      },
      priceAsset: "WAVES"
    },
    %{
      __type: "pair",
      amountAsset: "5WvPKSJXzVE2orvbkJ8wsQmmQKqTv9sGBPksV4adViw3",
      data: %{
        firstPrice: 63.35455619,
        high: 63.35455619,
        lastPrice: 62.13727713,
        low: 61.03366403,
        quoteVolume: 538.271381363297,
        txsCount: 61,
        volume: 8.62395678,
        volumeWaves: 538.271381363297,
        weightedAveragePrice: 62.4158254841459
      },
      priceAsset: "WAVES"
    },
    %{
      __type: "pair",
      amountAsset: "9jJq1tKm5J1bP4V4BBED1KnaYRmGUmTRndXVR9NkE3vY",
      data: %{
        firstPrice: 1.0e-8,
        high: 8.0e-8,
        lastPrice: 5.0e-8,
        low: 1.0e-8,
        quoteVolume: 530.91733368,
        txsCount: 35,
        volume: 12539522439,
        volumeWaves: 530.91733368,
        weightedAveragePrice: 4.23395178135938e-8
      },
      priceAsset: "WAVES"
    },
    %{
      __type: "pair",
      amountAsset: "EbLVSrAi6vS3AkLwBinzZCvAXP2yYiFJEzj1MBVHcwZ5",
      data: %{
        firstPrice: 4.5e-6,
        high: 4.55e-6,
        lastPrice: 4.53e-6,
        low: 4.3e-6,
        quoteVolume: 0.0575634900004158,
        txsCount: 32,
        volume: 12910.00041221,
        volumeWaves: 515.43608020434,
        weightedAveragePrice: 4.45882944712949e-6
      },
      priceAsset: "8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS"
    },
    %{
      __type: "pair",
      amountAsset: "EFmBdhoQDy2vkpkC2am33ANwxBFLGeJwAmWGvJeVmWmE",
      data: %{
        firstPrice: 0.01,
        high: 0.01,
        lastPrice: 0.01,
        low: 0.01,
        quoteVolume: 432.58,
        txsCount: 5,
        volume: 43258,
        volumeWaves: 454.073018686471,
        ...
      },
      priceAsset: "Ft8X1v1LTa1ABafufpaCWyVj8KkaxUWE6xBhW6sNFJck"
    },
    %{
      __type: "pair",
      amountAsset: "51LxAtwBXapvvTFSbbh4nLyWFxH6x8ocfNvrXxbTChze",
      data: %{
        firstPrice: 9.7999e-4,
        high: 9.8997e-4,
        lastPrice: 8.1999e-4,
        low: 0.0008,
        quoteVolume: 445.264776097594,
        txsCount: 70,
        volume: 520269.648299,
        ...
      },
      priceAsset: "WAVES"
    },
    %{
      __type: "pair",
      amountAsset: "AgPZuyURTDCT5KGypZjAzKbReiHdKqLWzmUHaHvsYgEJ",
      data: %{
        firstPrice: 1,
        high: 1,
        lastPrice: 1,
        low: 1,
        quoteVolume: 445,
        txsCount: 89,
        ...
      },
      priceAsset: "WAVES"
    },
    %{
      __type: "pair",
      amountAsset: "C9GgiMrWxJpNVR1itPhy834DePjyPtUEv3ERw9qHx7KV",
      data: %{
        firstPrice: 0.0052,
        high: 0.0075,
        lastPrice: 0.0075,
        low: 0.0052,
        quoteVolume: 366.733936640136, 
        ...
      },
      priceAsset: "WAVES"
    },
    %{
      __type: "pair",
      amountAsset: "Gtb1WRznfchDnTh37ezoDTJ4wcoKaRsKqKjJjy7nm2zU",
      data: %{firstPrice: 1.06, high: 1.1, lastPrice: 1.07, low: 1.06, ...},
      priceAsset: "Ft8X1v1LTa1ABafufpaCWyVj8KkaxUWE6xBhW6sNFJck"
    },
    %{
      __type: "pair",
      amountAsset: "DbngchPv6y1an7TQHQPEQ3uMj5ms5Qd46QVTgbgZ6ht3",
      data: %{firstPrice: 5.0e-8, high: 7.0e-8, lastPrice: 7.0e-8, ...},
      priceAsset: "WAVES"
    },
    %{
      __type: "pair",
      amountAsset: "291eANuyaSj9NiZTkMTXhktUudhFuYvR714BfqrshAWa",
      data: %{firstPrice: 0.93110333, high: 0.9511155, ...},
      priceAsset: "WAVES"
    },
    %{
      __type: "pair",
      amountAsset: "62LyMjcr2DtiyF5yVXFhoQ2q414VPPJXjsNYp72SuDCH",
      data: %{firstPrice: 0.01033244, ...},
      priceAsset: "8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS"
    },
    %{
      __type: "pair",
      amountAsset: "2AvD9e9XxWaX1R7haCXKEWVEs6wkHpzWP4BCygRg9Q1E",
      data: %{...},
      ...
    },
    %{__type: "pair", amountAsset: "WAVES", ...},
    %{__type: "pair", ...},
    %{...},
    ...
  ]
}

How would I go about extracting amountAsset, priceAsset, volumeWaves, lastPrice for all pairs where volumeWaves >= 500 as quickly as possible?

Thanks in advance for all your input! :slight_smile:

8 comments
#poison#httpoison#jason
3325 8

Showing Posts 1 to 8

outlog

outlog

very long post.. maybe shorten to minimum another time..

body.data |> Enum.filter(fn pair -> pair.volumeWaves >= 500 end)

0
Post #1
Maxximiliann

Maxximiliann OP 

iex(3)> body.data |> Enum.filter(fn pair -> pair.volumeWaves >= 500 end)

** (KeyError) key :volumeWaves not found in: %{__type: "pair", amountAsset: "4LHHvYGNKJUg5hj65aGD5vgScvCBmLpdRFtjokvCjSL8", data: %{firstPrice: 0.212, high: 0.2195, lastPrice: 0.20004809, low: 0.182, quoteVolume: 218697.680251146, txsCount: 3621, volume: 1094516.70099724, volumeWaves: 218697.680251146, weightedAveragePrice: 0.199812099762283}, priceAsset: "WAVES"}
    (stdlib) erl_eval.erl:680: :erl_eval.do_apply/6
    (stdlib) erl_eval.erl:479: :erl_eval.expr/5
    (elixir) lib/enum.ex:2934: Enum.filter_list/2

What’s missing?

0
Post #2
pdgonzalez872

pdgonzalez872

Hi @Maxximiliann! Since you said your were starting out, I decided to show you a couple of things about Elixir! Hopefully this helps you in your journey. :slight_smile:

I created a repo here: https://github.com/pdgonzalez872/maxximiliann that has an acceptance_test file. There, I show a couple of things about your problem, how to use some tools to your advantage (tests, pry) and ultimately help you with your question. For completeness, I added the content of the file below. Please read the code and hopefully this helps you in your journey.

PD

defmodule AcceptanceTest do
  use ExUnit.Case

  test "should work" do
    # Since you mentioned you are starting out, here are a couple of things you
    # may not know. If you do, disregard them.
    # You can use `require IEx; IEx.pry` to start a debugging session within a test.
    # You can then run the tests like so: `iex -S mix test`
    # more about Pry here: https://medium.com/@diamondgfx/debugging-phoenix-with-iex-pry-5417256e1d11

    # Uncomment line 20 below to allow pry to run in this test and when the
    # debugger asks you if you want to "Allow" Pry, press "Y" to jump in the
    # session. It is an IEx session, but through tests. Helpful to debug things
    # that you need to go back to later. If you need more than 60 seconds in
    # your debugging session (very common), pass the `trace` flag to the mix
    # command like so: `iex -S mix test --trace` to make the test have a
    # timeout of `infinity`.

    # require IEx; IEx.pry

    # I'm going to use the code you posted to keep things the same. Apples to
    # apples. :)

    res = HTTPoison.get!("https://api.wavesplatform.com/v0/pairs")
    body = Poison.decode!(res.body, keys: :atoms)

    # `body` is a `map` with the following keys:
    # We prove this by having the assertion below pass. If the keys were not
    # the same, this test would fail.
    assert Map.keys(body) == [:__type, :data]

    # we can see that `body.data` is a `list`:
    assert is_list(body.data) == true

    # you can also write the same thing above like this:
    assert is_list(body.data)

    # This is what the first element in your collection looks like:
    first_element = Enum.at(body.data, 0)

    # Using IO.inspect() is a great way to look at the shape your data has:
    msg = "This will print out to the terminal when you run the test, this is what first_element looks like"
    IO.inspect(first_element, label: msg)

    # These are the keys you have in `first_element`
    assert Map.keys(first_element) == [:__type, :amountAsset, :data, :priceAsset]

    # You mentioned you wanted `volumeWaves` for each element. You can see that
    # you don't have that key in that first map.
    # This is what you have inside `data`:
    assert Map.keys(first_element.data) == [:firstPrice, :high, :lastPrice, :low, :quoteVolume, :txsCount, :volume,
     :volumeWaves, :weightedAveragePrice]

    # There is a little hiccup with your data, you are getting floats back from
    # your api call, which is fine, but I suggest using a library when
    # dealing with float values. A great one is this one:
    # https://github.com/ericmj/decimal
    # Here is proof you have a float:
    assert is_float(first_element.data.firstPrice)

    # To answer your original question: When dealing with collections
    # (enumerables), look at the functions in `Enum`:
    # https://github.com/elixir-lang/elixir/blob/master/lib/elixir/lib/enum.ex
    # Here is `map/2`. The number by the function name is the number of
    # arguments it takes (called arity). `Map` iterates through the enumerable
    # you pass and keeps the result of a function you pass in as a second
    # argument:
    all_volume_waves_prices = Enum.map(body.data, fn element -> element.data.volumeWaves end)
    IO.inspect(all_volume_waves_prices)

    # To answer your question, we can also filter enumerables: `Enum.filter/2`
    # will return the element that returns `true` in the function you pass in
    # as a second argument:
    volume_waves_greater_than_500 = Enum.filter(body.data, fn element -> element.data.volumeWaves > 500.0 end)
    IO.inspect(volume_waves_greater_than_500)

    # Hope this helps. Thanks for asking the question and I hope you keep using Elixir.
  end
end

On a side note, here is a guide to markdown: Basic Syntax | Markdown Guide. It’s nice to be able to format things in these forums, helps you get your point across faster.

9
Post #3
Maxximiliann

Maxximiliann OP

Oh wow!!

Thank you so very much!!

I am humbled by your kindness and generosity :slight_smile: :slight_smile: :slight_smile:

2
Post #4
kokolegorille

kokolegorille

BTW there is a missing attribute in your code. To make it work You need to add a missing data, like this. (data is an internal struct of pair)

iex> body.data |> Enum.filter(fn pair -> pair.data.volumeWaves >= 500 end)
3
Post #5
dimitarvp

dimitarvp

IMO it’s clearly written what’s missing. The object you try to access volumeWaves property in does not have it. If you scanned the log output you would have seen that it’s inside a data property, or as @kokolegorille said: pair.data.volumeWaves.

Is the log output confusing or unreadable?

0
Post #6
kokolegorille

kokolegorille

We all started as beginner :slight_smile:

But You are true, Elixir errors are often self explanatory…

except dialyzer messages :slight_smile:

1
Post #7
dimitarvp

dimitarvp

Yes, they require PhD-s. :003:

0
Post #8
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Beam Bots (or just BB for short) is a framework for building fault-tolerant robotics applications in Elixir using familiar OTP patterns. ...
/beam-bots#library#robotics#bb
122 3775 29
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juhalehtonen
Chat & Discussions>Discussions

Stack Overflow Developer Survey 2026
There has been a thread to discuss the Stack Overflow Developer Survey on this forum every year since 2018, so here’s yet another one for...
#developer-survey#stack-overflow
10 4244 4
New
budgie
Chat & Discussions>Discussions

How does Elixir keep going?
I love Elixir. It’s one of 2 programming languages I’ve ever fallen in love with. But I don’t use it anymore. Serverless was the promis...
#language#serverless
155 2497 64
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