fix: set default content type as text for message (#3060)

Fixes #2974

app/models/message.rb

@@ -5,7 +5,7 @@
 #  id                  :integer          not null, primary key
 #  content             :text
 #  content_attributes  :json
-#  content_type        :integer          default("text")
+#  content_type        :integer          default("text"), not null
 #  external_source_ids :jsonb
 #  message_type        :integer          not null
 #  private             :boolean          default(FALSE)
@@ -32,10 +32,13 @@ class Message < ApplicationRecord
   include MessageFilterHelpers
   NUMBER_OF_PERMITTED_ATTACHMENTS = 15
 
+  before_validation :ensure_content_type
+
   validates :account_id, presence: true
   validates :inbox_id, presence: true
   validates :conversation_id, presence: true
   validates_with ContentAttributeValidator
+  validates :content_type, presence: true
 
   # when you have a temperory id in your frontend and want it echoed back via action cable
   attr_accessor :echo_id
@@ -133,6 +136,10 @@ class Message < ApplicationRecord
 
   private
 
+  def ensure_content_type
+    self.content_type ||= Message.content_types[:text]
+  end
+
   def execute_after_create_commit_callbacks
     # rails issue with order of active record callbacks being executed https://github.com/rails/rails/issues/20911
     reopen_conversation

db/migrate/20210923132659_set_content_type_text_for_the_old_messages.rb

@@ -0,0 +1,5 @@
+class SetContentTypeTextForTheOldMessages < ActiveRecord::Migration[6.1]
+  def change
+    change_column_null(:messages, :content_type, false, 0)
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2021_09_22_082754) do
+ActiveRecord::Schema.define(version: 2021_09_23_132659) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "pg_stat_statements"
@@ -519,7 +519,7 @@ ActiveRecord::Schema.define(version: 2021_09_22_082754) do
     t.boolean "private", default: false
     t.integer "status", default: 0
     t.string "source_id"
-    t.integer "content_type", default: 0
+    t.integer "content_type", default: 0, null: false
     t.json "content_attributes", default: {}
     t.string "sender_type"
     t.bigint "sender_id"

spec/controllers/api/v1/accounts/conversations/messages_controller_spec.rb

@@ -35,7 +35,7 @@ RSpec.describe 'Conversation Messages API', type: :request do
         expect(conversation.messages.first.content).to eq(params[:content])
       end
 
-      it 'creates an outgoing message with a specific bot sender' do
+      it 'creates an outgoing text message with a specific bot sender' do
         agent_bot = create(:agent_bot)
         time_stamp = Time.now.utc.to_s
         params = { content: 'test-message', external_created_at: time_stamp, sender_type: 'AgentBot', sender_id: agent_bot.id }
@@ -50,6 +50,7 @@ RSpec.describe 'Conversation Messages API', type: :request do
         expect(response_data['content_attributes']['external_created_at']).to eq time_stamp
         expect(conversation.messages.count).to eq(1)
         expect(conversation.messages.last.sender_id).to eq(agent_bot.id)
+        expect(conversation.messages.last.content_type).to eq('text')
       end
 
       it 'creates a new outgoing message with attachment' do

spec/models/message_spec.rb

@@ -77,4 +77,13 @@ RSpec.describe Message, type: :model do
       expect(ConversationReplyEmailWorker).not_to have_received(:perform_in)
     end
   end
+
+  context 'when content_type is blank' do
+    let(:message) { build(:message, content_type: nil, account: create(:account)) }
+
+    it 'sets content_type as text' do
+      message.save!
+      expect(message.content_type).to eq 'text'
+    end
+  end
 end