begin playing with using JSON API for deserialization

extract key_transfor

chaneg to case_transform gem

fix

tests pass

add empty array test

upgrade to jsonapi beta5, improve tests to be valid resource requests

use github links in gemfile for now, due to unreleased code

use github links in gemfile for now, due to unreleased code

some clenaup

deserialization would work now if it didn't depend on the existance of certain objects

progress on implementing new deserializer -- just have some behavior differences with relationships

tests pass

address rubocop issue -- update dependencies... wonder if we need to move @beauby's jsonapi gems to rails-api, in order to faster turnaround time

reduce to minimum dependencies. Now we need beauby to merge my jsonapi-rails branch :-)

Author: NullVoxPopuli

Gemfile

@@ -7,6 +7,8 @@ eval_gemfile local_gemfile if File.readable?(local_gemfile)
 # Specify your gem's dependencies in active_model_serializers.gemspec
 gemspec
 
+gem 'jsonapi-rails', github: 'beauby/jsonapi-rails', branch: 'initial-implementation'
+
 version = ENV['RAILS_VERSION'] || '4.2'
 
 if version == 'master'

active_model_serializers.gemspec

@@ -42,7 +42,7 @@ Gem::Specification.new do |spec|
   # 'minitest'
   # 'thread_safe'
 
-  spec.add_runtime_dependency 'jsonapi', '0.1.1.beta2'
+  spec.add_runtime_dependency 'jsonapi-deserializable', '~> 0.1.1.beta3'
   spec.add_runtime_dependency 'case_transform', '>= 0.2'
 
   spec.add_development_dependency 'activerecord', rails_versions

lib/active_model_serializers/adapter/json_api/deserialization.rb

@@ -1,12 +1,13 @@
+require 'jsonapi/parser'
+require 'jsonapi/rails'
+
 module ActiveModelSerializers
   module Adapter
     class JsonApi
       # NOTE(Experimental):
       # This is an experimental feature. Both the interface and internals could be subject
       # to changes.
       module Deserialization
-        InvalidDocument = Class.new(ArgumentError)
-
         module_function
 
         # Transform a JSON API document, containing a single data object,
@@ -73,140 +74,47 @@ module Deserialization
         #     # }
         #
         def parse!(document, options = {})
-          parse(document, options) do |invalid_payload, reason|
-            fail InvalidDocument, "Invalid payload (#{reason}): #{invalid_payload}"
+          parse(document, options) do |exception|
+            fail exception
           end
         end
 
         # Same as parse!, but returns an empty hash instead of raising InvalidDocument
         # on invalid payloads.
         def parse(document, options = {})
-          document = document.dup.permit!.to_h if document.is_a?(ActionController::Parameters)
-
-          validate_payload(document) do |invalid_document, reason|
-            yield invalid_document, reason if block_given?
-            return {}
-          end
-
-          primary_data = document['data']
-          attributes = primary_data['attributes'] || {}
-          attributes['id'] = primary_data['id'] if primary_data['id']
-          relationships = primary_data['relationships'] || {}
-
-          filter_fields(attributes, options)
-          filter_fields(relationships, options)
-
-          hash = {}
-          hash.merge!(parse_attributes(attributes, options))
-          hash.merge!(parse_relationships(relationships, options))
-
-          hash
-        end
-
-        # Checks whether a payload is compliant with the JSON API spec.
-        #
-        # @api private
-        # rubocop:disable Metrics/CyclomaticComplexity
-        def validate_payload(payload)
-          unless payload.is_a?(Hash)
-            yield payload, 'Expected hash'
-            return
-          end
-
-          primary_data = payload['data']
-          unless primary_data.is_a?(Hash)
-            yield payload, { data: 'Expected hash' }
-            return
-          end
-
-          attributes = primary_data['attributes'] || {}
-          unless attributes.is_a?(Hash)
-            yield payload, { data: { attributes: 'Expected hash or nil' } }
-            return
-          end
-
-          relationships = primary_data['relationships'] || {}
-          unless relationships.is_a?(Hash)
-            yield payload, { data: { relationships: 'Expected hash or nil' } }
-            return
-          end
-
-          relationships.each do |(key, value)|
-            unless value.is_a?(Hash) && value.key?('data')
-              yield payload, { data: { relationships: { key => 'Expected hash with :data key' } } }
-            end
-          end
+          # TODO: change to jsonapi-ralis to have default conversion to flat hashes
+          result = JSONAPI::Deserializable::ActiveRecord.new(document, options: options).to_hash
+          result = apply_options(result, options)
+          result
+        rescue JSONAPI::Parser::InvalidDocument => e
+          return {} unless block_given?
+          yield e
         end
-        # rubocop:enable Metrics/CyclomaticComplexity
-
-        # @api private
-        def filter_fields(fields, options)
-          if (only = options[:only])
-            fields.slice!(*Array(only).map(&:to_s))
-          elsif (except = options[:except])
-            fields.except!(*Array(except).map(&:to_s))
-          end
-        end
-
-        # @api private
-        def field_key(field, options)
-          (options[:keys] || {}).fetch(field.to_sym, field).to_sym
-        end
-
-        # @api private
-        def parse_attributes(attributes, options)
-          transform_keys(attributes, options)
-            .map { |(k, v)| { field_key(k, options) => v } }
-            .reduce({}, :merge)
-        end
-
-        # Given an association name, and a relationship data attribute, build a hash
-        # mapping the corresponding ActiveRecord attribute to the corresponding value.
-        #
-        # @example
-        #   parse_relationship(:comments, [{ 'id' => '1', 'type' => 'comments' },
-        #                                  { 'id' => '2', 'type' => 'comments' }],
-        #                                 {})
-        #    # => { :comment_ids => ['1', '2'] }
-        #   parse_relationship(:author, { 'id' => '1', 'type' => 'users' }, {})
-        #    # => { :author_id => '1' }
-        #   parse_relationship(:author, nil, {})
-        #    # => { :author_id => nil }
-        # @param [Symbol] assoc_name
-        # @param [Hash] assoc_data
-        # @param [Hash] options
-        # @return [Hash{Symbol, Object}]
-        #
-        # @api private
-        def parse_relationship(assoc_name, assoc_data, options)
-          prefix_key = field_key(assoc_name, options).to_s.singularize
-          hash =
-            if assoc_data.is_a?(Array)
-              { "#{prefix_key}_ids".to_sym => assoc_data.map { |ri| ri['id'] } }
-            else
-              { "#{prefix_key}_id".to_sym => assoc_data ? assoc_data['id'] : nil }
-            end
-
-          polymorphic = (options[:polymorphic] || []).include?(assoc_name.to_sym)
-          if polymorphic
-            hash["#{prefix_key}_type".to_sym] = assoc_data.present? ? assoc_data['type'] : nil
-          end
 
+        def apply_options(hash, options)
+          hash = transform_keys(hash, options) if options[:key_transform]
+          hash = hash.deep_symbolize_keys
+          hash = rename_fields(hash, options)
           hash
         end
 
-        # @api private
-        def parse_relationships(relationships, options)
-          transform_keys(relationships, options)
-            .map { |(k, v)| parse_relationship(k, v['data'], options) }
-            .reduce({}, :merge)
-        end
-
+        # TODO: transform the keys after parsing
         # @api private
         def transform_keys(hash, options)
           transform = options[:key_transform] || :underscore
           CaseTransform.send(transform, hash)
         end
+
+        def rename_fields(hash, options)
+          return hash unless options[:keys]
+
+          keys = options[:keys]
+          hash.each_with_object({}) do |(k, v), h|
+            k = keys.fetch(k, k)
+            h[k] = v
+            h
+          end
+        end
       end
     end
   end

test/action_controller/json_api/deserialization_test.rb

@@ -3,8 +3,8 @@
 module ActionController
   module Serialization
     class JsonApi
-      class KeyTransformTest < ActionController::TestCase
-        class KeyTransformTestController < ActionController::Base
+      class CaseTransformTest < ActionController::TestCase
+        class CaseTransformTestController < ActionController::Base
           class Post < ::Model
             attributes :title, :body, :publish_at
             associations :author, :top_comments
@@ -77,7 +77,7 @@ def render_resource_with_transform_with_global_config
           end
         end
 
-        tests KeyTransformTestController
+        tests CaseTransformTestController
 
         def test_render_resource_with_transform
           get :render_resource_with_transform