Parsing nested JSON

Questions / Help
, ,
1

(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:

1 Like
2

very long post… maybe shorten to minimum another time…

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

3 
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?

4

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: https://www.markdownguide.org/basic-syntax. It’s nice to be able to format things in these forums, helps you get your point across faster.

9 Likes
5

Oh wow!!

Thank you so very much!!

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

2 Likes
6

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 Likes
7

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?

8

We all started as beginner :slight_smile:

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

except dialyzer messages :slight_smile:

1 Like
9

Yes, they require PhD-s. :003: