JSONApi part1

spec/factories/product_order_factory.rb

@@ -1,5 +1,6 @@
 FactoryGirl.define do
   factory :product_order do
+    quantity 1
     association :order
     association :product
   end

spec/serializers/users/order_serializer.rb

@@ -0,0 +1,30 @@
+require 'spec_helper'
+
+describe Users::OrderSerializer do
+  let(:adapter){ ActiveModel::Serializer.config.adapter }
+  it "does not perform extra queries" do
+    l = create :list
+    o1 = create :order, list: l
+    create :product_order, order: o1
+    create :product_order, order: o1
+    o2 = create :order, list: l
+    create :product_order, order: o2
+    create :product_order, order: o2
+    list = List.find(l.id)
+    orders = list.orders.include_relation(:product_orders)
+    #expect{ object_as_json orders }.not_to exceed_query_limit 0
+    expect{ object_as_json orders }.not_to perform_any_queries
+    result = object_as_json(orders)
+    binding.pry
+    #result[:included].size.should eq 4
+  end
+
+  def object_as_json(obj)
+    serializer = if obj.is_a?(Array)
+      ActiveModel::Serializer::ArraySerializer.new(obj, serializer: described_class, add_included: true)
+    else
+      serializer = described_class.new(obj)
+    end
+    adapter.new(serializer, include: %w[product_orders]).as_json
+  end
+end

spec/support/query_limit.rb

@@ -0,0 +1,88 @@
+$performed_queries = []
+CouchRest.class_eval do
+  class << self
+    alias_method :old_get, :get
+    def get(uri, options={})
+      $performed_queries << {url: uri, options: options} if is_query_uri?(uri)
+      old_get(uri, options)
+    end
+
+    def is_query_uri?(uri)
+      return false if uri =~ /\/_design\/\w+$/ # request design doc
+      return false if uri =~ /\/_uuids/
+      true
+    end
+  end
+end
+# taken from: http://stackoverflow.com/questions/5490411/counting-the-number-of-queries-performed
+RSpec::Matchers.define :exceed_query_limit do |expected|
+
+  match do |block|
+    query_count(&block) > expected
+  end
+
+  failure_message_when_negated do |actual|
+    extra_queries = $performed_queries[expected..-1].map{|q| q[:url]}.map do |q|
+      if q =~ /5984\/\w+\/[0-9a-f]{32}$/
+        info = q
+        begin
+          record = CouchRest.get(q)
+          if record.is_a?(SimplyStored::Couch)
+            info += " #{record.class.name}"
+          end
+        rescue
+        end
+        info
+      else
+        q
+      end
+    end
+    "Expected to run maximum #{expected} queries, got #{@executed_queries}\nExtra queries:\n - #{extra_queries.join("\n - ")}"
+  end
+
+  def query_count(&block)
+    $performed_queries = []
+    block.call
+    @executed_queries = $performed_queries.size
+  end
+
+  def supports_block_expectations?
+    true
+  end
+
+end
+
+RSpec::Matchers.define :perform_any_queries do |expected|
+  match do |block|
+    query_count(&block) > 0
+  end
+
+  failure_message_when_negated do |actual|
+    extra_queries = $performed_queries.map{|q| q[:url]}.map do |q|
+      if q =~ /5984\/\w+\/[0-9a-f]{32}$/
+        info = q
+        begin
+          record = CouchRest.get(q)
+          if record.is_a?(SimplyStored::Couch)
+            info += " #{record.class.name}"
+          end
+        rescue
+        end
+        info
+      else
+        q
+      end
+    end
+    "Expected to run no queries, got #{@executed_queries}\nExtra queries:\n - #{extra_queries.join("\n - ")}"
+  end
+
+  def query_count(&block)
+    $performed_queries = []
+    block.call
+    @executed_queries = $performed_queries.size
+  end
+
+  def supports_block_expectations?
+    true
+  end
+end