added ValidationsRepresenter to jsonify and deserialize ActiveModel v…

…alidations.

lib/roar/rails/validations_representer.rb

@@ -0,0 +1,25 @@
+require 'representable/json/collection'
+require 'representable/json/hash'
+
+# Represents a validators hash for a model.
+module ValidatorsRepresenter
+  class ValidatorClient
+    attr_accessor :kind, :options
+  end
+
+  # Represents a single Validator instance.
+  module ValidatorRepresenter
+    include Roar::Representer::JSON
+    property :kind
+    hash :options
+  end
+
+  # Represents an array of validators for an attribute.
+  module AttributeValidators
+    include Representable::JSON::Collection
+    items :extend => ValidatorRepresenter, :class => ValidatorClient
+  end
+
+  include Representable::JSON::Hash
+  values :extend => AttributeValidators, :class => Array
+end

test/validations_test.rb

@@ -0,0 +1,34 @@
+require 'test_helper'
+require 'active_model'
+require 'roar/rails/validations_representer'
+
+
+class ValidationsTest < MiniTest::Spec
+ class Comment
+    include ActiveModel::Validations
+    validates :name, :presence => true
+  end
+
+  describe "ValidatorRepresenter" do
+    it "renders a representation in #to_json" do
+      assert_equal "{\"kind\":\"presence\",\"options\":{}}", Comment._validators[:name].first.extend(ValidatorsRepresenter::ValidatorRepresenter).to_json
+    end
+
+    it "parses validator config in #from_json" do
+      validator = ValidatorsRepresenter::ValidatorClient.new.extend(ValidatorsRepresenter::ValidatorRepresenter).from_json("{\"kind\":\"presence\",\"attributes\":[\"name\"],\"options\":{}}")
+      assert_equal "presence", validator.kind
+      assert_equal({}, validator.options)
+    end
+  end
+
+  describe "ValidatorsRepresenter" do
+    it "renders a collection in #to_json" do
+      assert_equal "{\"name\":[{\"kind\":\"presence\",\"options\":{}}]}", Comment._validators.extend(ValidatorsRepresenter).to_json
+    end
+
+    it "parses validators in #from_json" do
+      validations = {}.extend(ValidatorsRepresenter).from_json("{\"name\":[{\"kind\":\"presence\",\"options\":[]}]}")
+      assert_equal "presence", validations["name"].first.kind
+    end
+  end
+end