BREAKING CHANGE: Do not show models without table. Closes #3157

RailsAdmin no longer automatically exclude models for PaperTrail and ActiveStorage.
Exclude manually if you don't need them.

  config.excluded_models = ['PaperTrail::Version', 'PaperTrail::VersionAssociation', 'ActiveStorage::Attachment', 'ActiveStorage::Blob']

lib/rails_admin/abstract_model.rb

@@ -46,7 +46,7 @@ def reset_polymorphic_parents
     def initialize(model_or_model_name)
       @model_name = model_or_model_name.to_s
       ancestors = model.ancestors.collect(&:to_s)
-      if ancestors.include?('ActiveRecord::Base') && !model.abstract_class?
+      if ancestors.include?('ActiveRecord::Base') && !model.abstract_class? && model.table_exists?
         initialize_active_record
       elsif ancestors.include?('Mongoid::Document')
         initialize_mongoid

lib/rails_admin/config.rb

@@ -210,9 +210,7 @@ def default_search_operator=(operator)
 
       # pool of all found model names from the whole application
       def models_pool
-        excluded = (excluded_models.collect(&:to_s) + %w(RailsAdmin::History PaperTrail::Version PaperTrail::VersionAssociation ActiveStorage::Attachment ActiveStorage::Blob))
-
-        (viable_models - excluded).uniq.sort
+        (viable_models - excluded_models.collect(&:to_s)).uniq.sort
       end
 
       # Loads a model configuration instance from the registry or registers

spec/dummy_app/app/active_record/without_table.rb

@@ -0,0 +1,2 @@
+class WithoutTable < ActiveRecord::Base
+end

spec/orm/active_record.rb

@@ -62,6 +62,14 @@ def attribute_types
         Hash[columns.collect { |column| [column.name, lookup_attribute_type(column.type)] }]
     end
 
+    def table_exists?
+      true
+    end
+
+    def primary_key
+      "id"
+    end
+
   private
 
     def lookup_attribute_type(type)

spec/rails_admin/abstract_model_spec.rb

@@ -1,6 +1,16 @@
 require 'spec_helper'
 
 describe RailsAdmin::AbstractModel do
+  describe '.all' do
+    it 'returns abstract models for all models' do
+      expect(RailsAdmin::AbstractModel.all.map(&:model)).to include Player, Team
+    end
+
+    it 'does not pick up a model without table', active_record: true do
+      expect(RailsAdmin::AbstractModel.all.map(&:model)).not_to include WithoutTable
+    end
+  end
+
   describe '#to_s' do
     it 'returns model\'s name' do
       expect(RailsAdmin::AbstractModel.new(Cms::BasicPage).to_s).to eq Cms::BasicPage.to_s

spec/rails_admin/adapters/active_record/association_spec.rb

@@ -5,34 +5,34 @@
   before :all do
     RailsAdmin::AbstractModel.reset_polymorphic_parents
 
-    class ARBlog < ActiveRecord::Base
+    class ARBlog < Tableless
       has_many :a_r_posts
       has_many :a_r_comments, as: :commentable
       belongs_to :librarian, polymorphic: true
     end
 
-    class ARPost < ActiveRecord::Base
+    class ARPost < Tableless
       belongs_to :a_r_blog
       has_and_belongs_to_many :a_r_categories
       has_many :a_r_comments, as: :commentable
     end
 
-    class ARCategory < ActiveRecord::Base
+    class ARCategory < Tableless
       has_and_belongs_to_many :a_r_posts
       belongs_to :librarian, polymorphic: true
     end
 
-    class ARUser < ActiveRecord::Base
+    class ARUser < Tableless
       has_one :a_r_profile
       has_many :a_r_categories, as: :librarian
     end
 
-    class ARProfile < ActiveRecord::Base
+    class ARProfile < Tableless
       belongs_to :a_r_user
       has_many :a_r_blogs, as: :librarian
     end
 
-    class ARComment < ActiveRecord::Base
+    class ARComment < Tableless
       belongs_to :commentable, polymorphic: true
     end
 

spec/rails_admin/adapters/active_record_spec.rb

@@ -257,12 +257,9 @@ def build_statement(type, value, operator)
       end
 
       it 'chooses like statement in per-model basis' do
-        connection = double('connection')
-        allow(FieldTest).to receive(:connection).and_return(connection)
-
-        allow(connection).to receive(:adapter_name).and_return('postgresql')
+        allow(FieldTest.connection).to receive(:adapter_name).and_return('postgresql')
         expect(build_statement(:string, 'foo', 'default')).to eq(['(field ILIKE ?)', '%foo%'])
-        allow(connection).to receive(:adapter_name).and_return('sqlite3')
+        allow(FieldTest.connection).to receive(:adapter_name).and_return('sqlite3')
         expect(build_statement(:string, 'foo', 'default')).to eq(['(LOWER(field) LIKE ?)', '%foo%'])
       end