Error: ** (Protocol.UndefinedError) protocol Enumerable not implemented for "WAVES" of type BitString

Maxximiliann

Given:

market_data = 
[
  %{
    asset: "3QvxP6YFBKpWJSMAfYtL8Niv8KmmKsnpb9uQwQpg8QN2",
    last_price: 0.1249534,
    priced_in: "WAVES",
    volume: 13793.6013752778
  },
  %{
    asset: "3QvxP6YFBKpWJSMAfYtL8Niv8KmmKsnpb9uQwQpg8QN2",
    last_price: 1.626e-5,
    priced_in: "8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS",
    volume: 10311.7855749146
  },
  %{
    asset: "474jTeYx2r2Va35794tCScAXWJG9hU2HcgxzMowaZUnu",
    last_price: 189.658785,
    priced_in: "DG2xFkPdDwKUoBkzGAhQtLpSGzfXLiCYPEzeKH2Ad24p",
    volume: 52373.8805236538
  },
  %{
    asset: "474jTeYx2r2Va35794tCScAXWJG9hU2HcgxzMowaZUnu",
    last_price: 186.06, 
    priced_in: "WAVES",
    volume: 24023.1442492862
  },
  %{
    asset: "474jTeYx2r2Va35794tCScAXWJG9hU2HcgxzMowaZUnu",
    last_price: 0.02497085,
    priced_in: "8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS",
    volume: 8690.02335386836
  },
  %{
    asset: "4LHHvYGNKJUg5hj65aGD5vgScvCBmLpdRFtjokvCjSL8",
    last_price: 0.08150997,
    priced_in: "WAVES",
    volume: 40979.8114711376
  },
  %{
    asset: "4LHHvYGNKJUg5hj65aGD5vgScvCBmLpdRFtjokvCjSL8",
    last_price: 1.097e-5,
    priced_in: "8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS",
    volume: 252.945468613465
  },
  %{
    asset: "4LHHvYGNKJUg5hj65aGD5vgScvCBmLpdRFtjokvCjSL8",
    last_price: 0.08329,
    priced_in: "DG2xFkPdDwKUoBkzGAhQtLpSGzfXLiCYPEzeKH2Ad24p",
    volume: 201.247929171753
  },
  %{
    asset: "5WvPKSJXzVE2orvbkJ8wsQmmQKqTv9sGBPksV4adViw3",
    last_price: 0.00808268,
    priced_in: "8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS",
    volume: 3248.6225669422
  },
  %{
    asset: "5WvPKSJXzVE2orvbkJ8wsQmmQKqTv9sGBPksV4adViw3",
    last_price: 60.20503371,
    priced_in: "WAVES",
    volume: 516.180493091221
  },
  %{
    asset: "7Z5peMVTuyEesJcYn7B6DDtV8oqKAFueBA52vPuf59rh",
    last_price: 0.91104345,
    priced_in: "WAVES", 
    volume: 26300.1502283905
  },
  %{
    asset: "7Z5peMVTuyEesJcYn7B6DDtV8oqKAFueBA52vPuf59rh",
    last_price: 1.2554e-4,
    priced_in: "8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS",
    volume: 577.404317777729
  },
  %{
    asset: "8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS",
    last_price: 7532.54,
    priced_in: "DG2xFkPdDwKUoBkzGAhQtLpSGzfXLiCYPEzeKH2Ad24p",
    volume: 163617.091159899
  },
  %{
    asset: "8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS",
    last_price: 8250,
    priced_in: "34N9YcEETLWn93qYQ64EsP1x89tSruJU44RrEMSXXEPJ",
    volume: 1489.58529413729
  },
  %{
    asset: "Bwn3tDxj1rqqFGsnEy7Z829aj8Gs2UVQA7yktaJ6auHN",
    last_price: 7.1e-7,
    priced_in: "8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS",
    volume: 1259.50422417225
  },
  %{
    asset: "Bwn3tDxj1rqqFGsnEy7Z829aj8Gs2UVQA7yktaJ6auHN",
    last_price: 0.00430558,
    priced_in: "WAVES",
    volume: 290.292294688471
  },
  %{
    asset: "DHgwrRvVyqJsepd32YbBqUeDH4GJ1N984X8QoekjgH8J",
    last_price: 300000000005,
    priced_in: "7b4tRbsy8zNDW35gW9DETdRU5yaNoFGm2SvmwRuCns3f",
    volume: 447641.500005591
  },
  %{
    asset: "DHgwrRvVyqJsepd32YbBqUeDH4GJ1N984X8QoekjgH8J",
    last_price: 0.05229596,
    priced_in: "WAVES",
    volume: 14287.8709376739
  },
  %{
    asset: "DHgwrRvVyqJsepd32YbBqUeDH4GJ1N984X8QoekjgH8J",
    last_price: 0.05294568,
    priced_in: "DG2xFkPdDwKUoBkzGAhQtLpSGzfXLiCYPEzeKH2Ad24p",
    volume: 13348.2393706553
  },
  %{
    asset: "DHgwrRvVyqJsepd32YbBqUeDH4GJ1N984X8QoekjgH8J",
    last_price: 7.94e-6,
    priced_in: "8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS",
    volume: 10824.4211299108
  },
  %{
    asset: "EYz8Zvs62D4d7F5ZgXHCWuzuFaZg63FYnfVQrTWQoLSK",
    last_price: 7.9e-5,
    priced_in: "8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS",
    volume: 1666.02995108187
  },
  %{
    asset: "EYz8Zvs62D4d7F5ZgXHCWuzuFaZg63FYnfVQrTWQoLSK",
    last_price: 0.57,
    priced_in: "WAVES",
    volume: 1582.6257
  },
  %{
    asset: "HZk1mbfuJpmxU1Fs4AX5MWLVYtctsNcg6e2C6VKqK8zk",
    last_price: 0.00594059,
    priced_in: "8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS",
    volume: 4020.64881215575
  },
  %{
    asset: "HZk1mbfuJpmxU1Fs4AX5MWLVYtctsNcg6e2C6VKqK8zk",
    last_price: 43.9669216,
    priced_in: "WAVES",
    volume: 2384.30279291976
  },
  %{
    asset: "WAVES",
    last_price: 1.010899,
    priced_in: "DG2xFkPdDwKUoBkzGAhQtLpSGzfXLiCYPEzeKH2Ad24p",
    volume: 383661.118208469
  },
  %{
    asset: "WAVES",
    last_price: 1.3345e-4,
    priced_in: "8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS",
    volume: 51539.1607843401
  },
  %{
    asset: "WAVES",
    last_price: 1.0467, 
    priced_in: "34N9YcEETLWn93qYQ64EsP1x89tSruJU44RrEMSXXEPJ",
    volume: 705.83415129
  }
]

Code:

def conversions do
		market_data
		|> Enum.map(fn map -> if Enum.member?(map.priced_in, "8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS") do
				%{
					asset: map.asset,
					btc_price: map.last_price
				}
			else
				%{
					asset: map.asset,
					price: map.last_price,
					priced_in: map.priced_in,
					asset_to_btc_rate: asset_to_btc_rate(map.priced_in),
					btc_price: map.last_price * asset_to_btc_rate(map.priced_in)
				}
			end
		end) 
end

Error: ** (Protocol.UndefinedError) protocol Enumerable not implemented for "WAVES" of type BitString. This protocol is implemented for the following type(s): Ecto.Adapters.SQL.Stream, Postgrex.Stream, DBConnection.PrepareStream, DBConnection.Stream, HashSet, Map, Function, List, File.Stream, Date.Range, Range, HashDict, MapSet, Stream, IO.Stream, GenEvent.Stream

What’s going on here and how do I resolve this issue? Thanks for your patient help!

6 comments

#protocols #errors

0 6894 6

2020-04-25 13:42:44 UTC

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Marcus

Hello,

you are mapping over a list of maps. Therefore you get a map and map.prieced_in is a binary and this you give to Enum.member?, but Enum.member? needs an enumerable not a binary. The first data, in this case, is "WAVES" and for this protocol Enumerable not implemented ...

Post #1

Maxximiliann

Thank you for clarifying
Here’s a workaround I’ve attempted:


market_data
		|> Enum.map(fn(map.priced_in) -> 
			case map.priced_in do
				map.priced_in != "8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS" ->
					%{
						asset: map.asset,
						price: map.last_price,
						priced_in: map.priced_in,
						asset_to_btc_rate: asset_to_btc_rate(map.priced_in),
						btc_price: map.last_price * asset_to_btc_rate(map.priced_in)
					}
					map.priced_in == "8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS" ->
						%{
							asset: map.asset,
							btc_price: map.last_price
						}
						_ ->
							%{
								asset: map.asset,
								price: map.last_price,
								priced_in: map.priced_in,
								status: "NIL ERROR"
							}
						end
					end)

iex(2)> recompile
Compiling 1 file (.ex)

** (CompileError) : cannot invoke remote function map.priced_in/0 inside a match

How can I make this work? Thanks again!

Post #2

andreolvr

The compile error is happening because this is not the correct syntax for case, take a look at https://elixir-lang.org/getting-started/case-cond-and-if.html. Another problem in this logic is that the third clause (_) will never be reached, the value is equals 8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS or not. There is no third option. Maybe you are looking for an if/else instead of a case?

Post #3

Maxximiliann

Thanks for your input.

def conversions do
	market_data
	|> Enum.map(fn map -> if map.priced_in != "8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS" do
		%{
			asset: map.asset,
			price: map.last_price,
			priced_in: map.priced_in,
			asset_to_btc_rate: asset_to_btc_rate(map.priced_in),
			btc_price: map.last_price * asset_to_btc_rate(map.priced_in)
		}
	else
		%{
			asset: map.asset,
			btc_price: map.last_price
		}
	end
end)

Yields:

** (Protocol.UndefinedError) protocol Enumerable not implemented for nil of type Atom. This protocol is implemented for the following type(s): Ecto.Adapters.SQL.Stream, Postgrex.Stream, DBConnection.PrepareStream, DBConnection.Stream, HashSet, Map, Function, List, File.Stream, Date.Range, Range, HashDict, MapSet, Stream, IO.Stream, GenEvent.Stream

How do I address this nilcase without a case statement?

Post #4

Marcus

Maybe, you needs …

def conversions(nil), do: nil
def conversions(market_data) do
	Enum.map(market_data, fn map -> 
		if map.priced_in != "8LQW8f7P5d5PZM7GtZEBgaqRPGSzS3DfPuiXrURJ4AJS" do
			%{
				asset: map.asset,
				price: map.last_price,
				priced_in: map.priced_in,
				asset_to_btc_rate: asset_to_btc_rate(map.priced_in),
				btc_price: map.last_price * asset_to_btc_rate(map.priced_in)
			}
		else
			%{
				asset: map.asset,
				btc_price: map.last_price
			}
		end
	end)
end

Post #5