Remove channel index since we use channel_hash now

Author: npezza93

lib/generators/solid_cable/install/templates/db/cable_schema.rb

@@ -4,7 +4,6 @@
     t.binary "payload", limit: 536870912, null: false
     t.datetime "created_at", null: false
     t.integer "channel_hash", limit: 8, null: false
-    t.index ["channel"], name: "index_solid_cable_messages_on_channel"
     t.index ["channel_hash"], name: "index_solid_cable_messages_on_channel_hash"
     t.index ["created_at"], name: "index_solid_cable_messages_on_created_at"
   end

lib/generators/solid_cable/update/templates/db/migrate/remove_channel_index.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+class RemoveChannelIndex < ActiveRecord::Migration[7.2]
+  def up
+    remove_index :solid_cable_messages, :channel, if_exists: true
+  end
+
+  def down
+    add_index :solid_cable_messages, :channel, if_not_exists: true
+  end
+end

lib/generators/solid_cable/update/update_generator.rb

@@ -11,5 +11,7 @@ class SolidCable::UpdateGenerator < Rails::Generators::Base
   def copy_files
     migration_template "db/migrate/create_compact_channel.rb",
                        "db/cable_migrate/create_compact_channel.rb"
+    migration_template "db/migrate/remove_channel_index.rb",
+                       "db/cable_migrate/remove_channel_index.rb"
   end
 end

test/lib/generators/solid_cable/update/update_generator_test.rb

@@ -8,7 +8,11 @@ class SolidCable::UpdateGeneratorTest < Rails::Generators::TestCase
   setup :prepare_destination
   setup :run_generator
 
-  test "cable_schema exists" do
+  test "compact_channel migration exists" do
     assert_migration "db/cable_migrate/create_compact_channel.rb"
   end
+
+  test "channel index removal migration exists" do
+    assert_migration "db/cable_migrate/remove_channel_index.rb"
+  end
 end