Implement as_map protocol (WIP)

lib/couchdb_connector/as_map.ex

@@ -0,0 +1,23 @@
+defprotocol AsMap do
+  @moduledoc """
+  """
+  def as_map(json)
+end
+
+defimpl AsMap, for: BitString do
+
+  Poison.decode("")
+  def as_map(json) do
+    case Poison.decode(json) do
+      {:ok, decoded} -> decoded
+      {:error, :invalid} ->
+        raise RuntimeError, message:
+        """
+        Document returned by CouchDB is invalid
+        json: #{json}
+        """
+      {:error, reason} ->
+        raise RuntimeError, message: "Document returned by CouchDB is not parseable\nreason: #{elem(reason, 0)}\nchar: #{elem(reason, 1)}\njson: #{json}"
+    end
+  end
+end

test/couchdb_connector/as_map_test.exs

@@ -0,0 +1,31 @@
+defmodule Couchdb.Connector.AsMapTest do
+  use ExUnit.Case
+
+  import AsMap
+
+  test "as_map/2 with invalid json string should raise RuntimeError" do
+    invalid = "{\"_id\":\"foo\",\"_rev\":\"1-0f97561a543ed2e9c98a24dea818ec10\",test_key\":\"test_value\"}\n"
+
+    assert_raise(RuntimeError, """
+    Document returned by CouchDB is not parseable
+    reason: invalid
+    char: t
+    json: {"_id":"foo","_rev":"1-0f97561a543ed2e9c98a24dea818ec10",test_key":"test_value"}
+    """, fn -> as_map(invalid) end)
+  end
+
+  test "as_map/2 with empty string should raise RuntimeError" do
+    empty = ""
+
+    assert_raise(RuntimeError, """
+    Document returned by CouchDB is invalid
+    json: 
+    """,
+    fn -> as_map(empty) end)
+  end
+
+  # test "as_map/2 with valid json string should return decoded Map" do
+  #   valid = "{\"_id\":\"foo\",\"_rev\":\"1-0f97561a543ed2e9c98a24dea818ec10\",test_key\":\"test_value\"}\n"
+  #
+  # end
+end