chore: Add sla policy association to conversation (#7360)

Adds the sla policy association to the conversation

Fixes: https://linear.app/chatwoot/issue/CW-1615/applying-an-sla-to-the-conversation

app/models/conversation.rb

@@ -24,6 +24,7 @@
 #  contact_inbox_id       :bigint
 #  display_id             :integer          not null
 #  inbox_id               :integer          not null
+#  sla_policy_id          :bigint
 #  team_id                :bigint
 #
 # Indexes
@@ -294,3 +295,5 @@ def validate_referer_url
     "NEW.display_id := nextval('conv_dpid_seq_' || NEW.account_id);"
   end
 end
+
+Conversation.include_mod_with('EnterpriseConversationConcern')

db/migrate/20230620132319_add_sla_policy_to_conversations.rb

@@ -0,0 +1,5 @@
+class AddSlaPolicyToConversations < ActiveRecord::Migration[7.0]
+  def change
+    add_column :conversations, :sla_policy_id, :bigint
+  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[7.0].define(version: 2023_06_12_103936) do
+ActiveRecord::Schema[7.0].define(version: 2023_06_20_132319) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "pg_stat_statements"
   enable_extension "pg_trgm"
@@ -448,6 +448,7 @@
     t.datetime "assignee_last_seen_at", precision: nil
     t.datetime "first_reply_created_at", precision: nil
     t.integer "priority"
+    t.bigint "sla_policy_id"
     t.index ["account_id", "display_id"], name: "index_conversations_on_account_id_and_display_id", unique: true
     t.index ["account_id", "id"], name: "index_conversations_on_id_and_account_id"
     t.index ["account_id", "inbox_id", "status", "assignee_id"], name: "conv_acid_inbid_stat_asgnid_idx"

enterprise/app/models/enterprise/enterprise_conversation_concern.rb

@@ -0,0 +1,7 @@
+module Enterprise::EnterpriseConversationConcern
+  extend ActiveSupport::Concern
+
+  included do
+    belongs_to :sla_policy, optional: true
+  end
+end

enterprise/app/models/sla_policy.rb

@@ -18,4 +18,6 @@
 class SlaPolicy < ApplicationRecord
   belongs_to :account
   validates :name, presence: true
+
+  has_many :conversations, dependent: :nullify
 end

spec/enterprise/models/conversation_spec.rb

@@ -0,0 +1,7 @@
+require 'rails_helper'
+
+RSpec.describe Conversation, type: :model do
+  describe 'associations' do
+    it { is_expected.to belong_to(:sla_policy).optional }
+  end
+end

spec/enterprise/models/sla_policy_spec.rb

@@ -11,6 +11,7 @@
 
   describe 'associations' do
     it { is_expected.to belong_to(:account) }
+    it { is_expected.to have_many(:conversations).dependent(:nullify) }
   end
 
   describe 'validates_factory' do

spec/models/conversation_spec.rb

@@ -8,6 +8,11 @@
   describe 'associations' do
     it { is_expected.to belong_to(:account) }
     it { is_expected.to belong_to(:inbox) }
+    it { is_expected.to belong_to(:contact) }
+    it { is_expected.to belong_to(:contact_inbox) }
+    it { is_expected.to belong_to(:assignee).optional }
+    it { is_expected.to belong_to(:team).optional }
+    it { is_expected.to belong_to(:campaign).optional }
   end
 
   describe 'concerns' do