Improve performance initializing OutgoingMessage

Reduces the amount of queries to associated objects by directly checking the
database before setting the default body content.

Before

> info_request.outgoing_messages
  OutgoingMessage Load (0.4ms)  SELECT "outgoing_messages".* FROM "outgoing_messages" WHERE "outgoing_messages"."info_request_id" = 137 ORDER BY created_at
  InfoRequest Load (0.5ms)  SELECT "info_requests".* FROM "info_requests" WHERE "info_requests"."id" = 137 LIMIT 1
  PublicBody Load (0.5ms)  SELECT "public_bodies".* FROM "public_bodies" WHERE "public_bodies"."id" = 16 LIMIT 1
  HasTagString::HasTagStringTag Load (0.4ms)  SELECT "has_tag_string_tags".* FROM "has_tag_string_tags" WHERE "has_tag_string_tags"."model_id" = 16 AND (model = 'PublicBody')
  CensorRule Load (0.4ms)  SELECT "censor_rules".* FROM "censor_rules" WHERE "censor_rules"."info_request_id" IS NULL AND "censor_rules"."public_body_id" IS NULL AND "censor_rules"."user_id" IS NULL
  User Load (0.4ms)  SELECT "users".* FROM "users" WHERE "users"."id" = 13 LIMIT 1
   (0.5ms)  SELECT COUNT(*) FROM "censor_rules" WHERE "censor_rules"."user_id" = 13
  CensorRule Load (0.5ms)  SELECT "censor_rules".* FROM "censor_rules" WHERE "censor_rules"."info_request_id" = 137 ORDER BY created_at desc
  CensorRule Load (0.5ms)  SELECT "censor_rules".* FROM "censor_rules" WHERE "censor_rules"."public_body_id" = 16 ORDER BY created_at desc
  InfoRequest Load (0.5ms)  SELECT "info_requests".* FROM "info_requests" WHERE "info_requests"."id" = 137 LIMIT 1
  PublicBody Load (0.5ms)  SELECT "public_bodies".* FROM "public_bodies" WHERE "public_bodies"."id" = 16 LIMIT 1
  HasTagString::HasTagStringTag Load (0.6ms)  SELECT "has_tag_string_tags".* FROM "has_tag_string_tags" WHERE "has_tag_string_tags"."model_id" = 16 AND (model = 'PublicBody')
  CensorRule Load (0.5ms)  SELECT "censor_rules".* FROM "censor_rules" WHERE "censor_rules"."info_request_id" IS NULL AND "censor_rules"."public_body_id" IS NULL AND "censor_rules"."user_id" IS NULL
  User Load (0.6ms)  SELECT "users".* FROM "users" WHERE "users"."id" = 13 LIMIT 1
   (0.5ms)  SELECT COUNT(*) FROM "censor_rules" WHERE "censor_rules"."user_id" = 13
  CensorRule Load (0.4ms)  SELECT "censor_rules".* FROM "censor_rules" WHERE "censor_rules"."info_request_id" = 137 ORDER BY created_at desc
  CensorRule Load (0.5ms)  SELECT "censor_rules".* FROM "censor_rules" WHERE "censor_rules"."public_body_id" = 16 ORDER BY created_at desc
=> [#<OutgoingMessage id: 36, info_request_id: 137, body: "Some information please", status: "sent", message_type: "initial_request", created_at: "2015-04-17 10:50:21", updated_at: "2015-04-17 10:50:21", last_sent_at: "2015-04-17 10:50:21", incoming_message_followup_id: nil, what_doing: "normal_sort", prominence: "normal", prominence_reason: nil>, #<OutgoingMessage id: 37, info_request_id: 137, body: "Dear Example Public Body 6,\r\n\r\nc'mooooooonnnnnn\r\n\r\n...", status: "sent", message_type: "followup", created_at: "2015-04-20 12:18:30", updated_at: "2015-04-20 12:18:30", last_sent_at: "2015-04-20 12:18:30", incoming_message_followup_id: 30, what_doing: "normal_sort", prominence: "normal", prominence_reason: nil>]

After

> info_request.outgoing_messages
  OutgoingMessage Load (0.8ms)  SELECT "outgoing_messages".* FROM "outgoing_messages" WHERE "outgoing_messages"."info_request_id" = 137 ORDER BY created_at
=> [#<OutgoingMessage id: 36, info_request_id: 137, body: "Some information please", status: "sent", message_type: "initial_request", created_at: "2015-04-17 10:50:21", updated_at: "2015-04-17 10:50:21", last_sent_at: "2015-04-17 10:50:21", incoming_message_followup_id: nil, what_doing: "normal_sort", prominence: "normal", prominence_reason: nil>, #<OutgoingMessage id: 37, info_request_id: 137, body: "Dear Example Public Body 6,\r\n\r\nc'mooooooonnnnnn\r\n\r\n...", status: "sent", message_type: "followup", created_at: "2015-04-20 12:18:30", updated_at: "2015-04-20 12:18:30", last_sent_at: "2015-04-20 12:18:30", incoming_message_followup_id: 30, what_doing: "normal_sort", prominence: "normal", prominence_reason: nil>]

0 files changed, 0 insertions, 0 deletions