Added QueryRecorder to test N+1 fix on Milestone#showjej-fix-n+1-queries-milestones-show

1 files changed, 40 insertions, 0 deletions

diff --git a/spec/support/query_recorder.rb b/spec/support/query_recorder.rb
new file mode 100644
index 00000000000..e40d5ebd9a8
--- /dev/null
+++ b/spec/support/query_recorder.rb
@@ -0,0 +1,40 @@
+module ActiveRecord
+  class QueryRecorder
+    attr_reader :log
+
+    def initialize(&block)
+      @log = []
+      ActiveSupport::Notifications.subscribed(method(:callback), 'sql.active_record', &block)
+    end
+
+    def callback(name, start, finish, message_id, values)
+      return if %w(CACHE SCHEMA).include?(values[:name])
+      @log << values[:sql]
+    end
+
+    def count
+      @log.count
+    end
+
+    def log_message
+      @log.join("\n\n")
+    end
+  end
+end
+
+RSpec::Matchers.define :exceed_query_limit do |expected|
+  supports_block_expectations
+
+  match do |block|
+    query_count(&block) > expected
+  end
+
+  failure_message_when_negated do |actual|
+    "Expected a maximum of #{expected} queries, got #{@recorder.count}:\n\n#{@recorder.log_message}"
+  end
+
+  def query_count(&block)
+    @recorder = ActiveRecord::QueryRecorder.new(&block)
+    @recorder.count
+  end
+end