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collection of persistence helper methods
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| defmodule FunctionHead do | |
| def create(attrs) when is_map(attrs) do | |
| with {:ok, doc} <- new(attrs), | |
| {:ok, _ } <- persist(doc), | |
| do: {:ok, doc} | |
| end | |
| def persist(doc), do: ExAws.Dynamo.put_item(__MODULE__.table_name, doc) | |
| def where(filter) when is_map(filter) do | |
| with {:ok, response } <- ExAws.Dynamo.get_item(__MODULE__.table_name, filter), | |
| decoded = decode(response), | |
| do: new(decoded) | |
| end | |
| def new(attrs) | |
| def new(attrs: nil), do: {:ok, nil} | |
| def new(attrs) when is_map(attrs) do | |
| with doc <- doc_struct(attrs), | |
| IO.puts("doc: #{ inspect(doc) }"), | |
| {:ok, mdoc} <- migrate(doc), | |
| do: {:ok, doc_struct(mdoc)} | |
| end | |
| defp doc_struct(doc) | |
| defp doc_struct(doc: nil), do: nil | |
| defp doc_struct(doc) when is_map(doc), do: struct(__MODULE__, doc) | |
| defp decode(doc) when is_map(doc) do | |
| if Map.has_key?(doc, "Item"), do: (ExAws.Dynamo.Decoder.decode(doc["Item"], as: __MODULE__)) | |
| end | |
| def migrate(doc), do: doc | |
| end | |
| [dev@localhost function_head]$ iex -S mix | |
| Erlang/OTP 18 [erts-7.2] [source-e6dd627] [64-bit] [smp:4:4] [async-threads:10] [hipe] [kernel-poll:false] | |
| lib/function_head.ex:18: warning: this clause cannot match because a previous clause at line 18 always matches | |
| Compiled lib/function_head.ex | |
| Interactive Elixir (1.2.0) - press Ctrl+C to exit (type h() ENTER for help) |
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