Add conversations API (#8832)

* Add conversations API

* Add web UI for conversations

* Add test for conversations API

* Add tests for ConversationAccount

* Improve web UI

* Rename ConversationAccount to AccountConversation

* Remove conversations on block and mute

* Change last_status_id to be a denormalization of status_ids

* Add optimistic locking

2 files changed, 30 insertions, 1 deletions

diff --git a/db/migrate/20180929222014_create_account_conversations.rb b/db/migrate/20180929222014_create_account_conversations.rb
new file mode 100644
index 000000000..53fa137e1
--- /dev/null
+++ b/db/migrate/20180929222014_create_account_conversations.rb
@@ -0,0 +1,14 @@
+class CreateAccountConversations < ActiveRecord::Migration[5.2]
+  def change
+    create_table :account_conversations do |t|
+      t.belongs_to :account, foreign_key: { on_delete: :cascade }
+      t.belongs_to :conversation, foreign_key: { on_delete: :cascade }
+      t.bigint :participant_account_ids, array: true, null: false, default: []
+      t.bigint :status_ids, array: true, null: false, default: []
+      t.bigint :last_status_id, null: true, default: nil
+      t.integer :lock_version, null: false, default: 0
+    end
+
+    add_index :account_conversations, [:account_id, :conversation_id, :participant_account_ids], unique: true, name: 'index_unique_conversations'
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 577296a6a..1458bd70f 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,10 +10,23 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2018_08_20_232245) do
+ActiveRecord::Schema.define(version: 2018_09_29_222014) do
+
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
 
+  create_table "account_conversations", force: :cascade do |t|
+    t.bigint "account_id"
+    t.bigint "conversation_id"
+    t.bigint "participant_account_ids", default: [], null: false, array: true
+    t.bigint "status_ids", default: [], null: false, array: true
+    t.bigint "last_status_id"
+    t.integer "lock_version", default: 0, null: false
+    t.index ["account_id", "conversation_id", "participant_account_ids"], name: "index_unique_conversations", unique: true
+    t.index ["account_id"], name: "index_account_conversations_on_account_id"
+    t.index ["conversation_id"], name: "index_account_conversations_on_conversation_id"
+  end
+
   create_table "account_domain_blocks", force: :cascade do |t|
     t.string "domain"
     t.datetime "created_at", null: false
@@ -597,6 +610,8 @@ ActiveRecord::Schema.define(version: 2018_08_20_232245) do
     t.index ["user_id"], name: "index_web_settings_on_user_id", unique: true
   end
 
+  add_foreign_key "account_conversations", "accounts", on_delete: :cascade
+  add_foreign_key "account_conversations", "conversations", on_delete: :cascade
   add_foreign_key "account_domain_blocks", "accounts", name: "fk_206c6029bd", on_delete: :cascade
   add_foreign_key "account_moderation_notes", "accounts"
   add_foreign_key "account_moderation_notes", "accounts", column: "target_account_id"