Add searchable attributes to element and ingredient definition

Use the same attribute as in page definition for element and ingredient definition. This will ease the upgrade of alchemy-pg_search to Alchemy 8.0.

Ref: AlchemyCMS/alchemy-pg_search#69
(cherry picked from commit 152a003)

Author: sascha-karnatz

app/models/alchemy/element.rb

@@ -41,6 +41,7 @@ class Element < BaseRecord
       "ingredients",
       "message",
       "nestable_elements",
+      "searchable",
       "taggable",
       "warning"
     ].freeze

app/models/alchemy/element_definition.rb

@@ -22,6 +22,7 @@ class ElementDefinition
     attribute :warning
     attribute :hint
     attribute :icon
+    attribute :searchable, :boolean, default: true
 
     validates :name,
       presence: true,

app/models/alchemy/ingredient_definition.rb

@@ -17,6 +17,7 @@ class IngredientDefinition
     attribute :default
     attribute :deprecated
     attribute :hint
+    attribute :searchable, :boolean, default: true
 
     validates :role,
       presence: true,

spec/models/alchemy/element_definition_spec.rb

@@ -32,6 +32,7 @@ module Alchemy
       it { is_expected.to have_key(:message) }
       it { is_expected.to have_key(:warning) }
       it { is_expected.to have_key(:hint) }
+      it { is_expected.to have_key(:searchable) }
     end
 
     describe "validations" do

spec/models/alchemy/ingredient_definition_spec.rb

@@ -27,6 +27,7 @@ module Alchemy
       it { is_expected.to have_key(:default) }
       it { is_expected.to have_key(:deprecated) }
       it { is_expected.to have_key(:hint) }
+      it { is_expected.to have_key(:searchable) }
     end
 
     describe "validations" do