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

1 files changed, 72 insertions, 0 deletions

diff --git a/spec/models/account_conversation_spec.rb b/spec/models/account_conversation_spec.rb
new file mode 100644
index 000000000..70a76281e
--- /dev/null
+++ b/spec/models/account_conversation_spec.rb
@@ -0,0 +1,72 @@
+require 'rails_helper'
+
+RSpec.describe AccountConversation, type: :model do
+  let!(:alice) { Fabricate(:account, username: 'alice') }
+  let!(:bob)   { Fabricate(:account, username: 'bob') }
+  let!(:mark)  { Fabricate(:account, username: 'mark') }
+
+  describe '.add_status' do
+    it 'creates new record when no others exist' do
+      status = Fabricate(:status, account: alice, visibility: :direct)
+      status.mentions.create(account: bob)
+
+      conversation = AccountConversation.add_status(alice, status)
+
+      expect(conversation.participant_accounts).to include(bob)
+      expect(conversation.last_status).to eq status
+      expect(conversation.status_ids).to eq [status.id]
+    end
+
+    it 'appends to old record when there is a match' do
+      last_status  = Fabricate(:status, account: alice, visibility: :direct)
+      conversation = AccountConversation.create!(account: alice, conversation: last_status.conversation, participant_account_ids: [bob.id], status_ids: [last_status.id])
+
+      status = Fabricate(:status, account: bob, visibility: :direct, thread: last_status)
+      status.mentions.create(account: alice)
+
+      new_conversation = AccountConversation.add_status(alice, status)
+
+      expect(new_conversation.id).to eq conversation.id
+      expect(new_conversation.participant_accounts).to include(bob)
+      expect(new_conversation.last_status).to eq status
+      expect(new_conversation.status_ids).to eq [last_status.id, status.id]
+    end
+
+    it 'creates new record when new participants are added' do
+      last_status  = Fabricate(:status, account: alice, visibility: :direct)
+      conversation = AccountConversation.create!(account: alice, conversation: last_status.conversation, participant_account_ids: [bob.id], status_ids: [last_status.id])
+
+      status = Fabricate(:status, account: bob, visibility: :direct, thread: last_status)
+      status.mentions.create(account: alice)
+      status.mentions.create(account: mark)
+
+      new_conversation = AccountConversation.add_status(alice, status)
+
+      expect(new_conversation.id).to_not eq conversation.id
+      expect(new_conversation.participant_accounts).to include(bob, mark)
+      expect(new_conversation.last_status).to eq status
+      expect(new_conversation.status_ids).to eq [status.id]
+    end
+  end
+
+  describe '.remove_status' do
+    it 'updates last status to a previous value' do
+      last_status  = Fabricate(:status, account: alice, visibility: :direct)
+      status       = Fabricate(:status, account: alice, visibility: :direct)
+      conversation = AccountConversation.create!(account: alice, conversation: last_status.conversation, participant_account_ids: [bob.id], status_ids: [status.id, last_status.id])
+      last_status.mentions.create(account: bob)
+      last_status.destroy!
+      conversation.reload
+      expect(conversation.last_status).to eq status
+      expect(conversation.status_ids).to eq [status.id]
+    end
+
+    it 'removes the record if no other statuses are referenced' do
+      last_status  = Fabricate(:status, account: alice, visibility: :direct)
+      conversation = AccountConversation.create!(account: alice, conversation: last_status.conversation, participant_account_ids: [bob.id], status_ids: [last_status.id])
+      last_status.mentions.create(account: bob)
+      last_status.destroy!
+      expect(AccountConversation.where(id: conversation.id).count).to eq 0
+    end
+  end
+end