Fixed filter by enum filter when label <> value

Gemfile

@@ -8,7 +8,7 @@ gem 'devise'
 group :active_record do
   platforms :ruby, :mswin, :mingw do
     gem 'mysql2', '~> 0.3.14'
-    gem 'pg', '>= 0.14'
+    gem 'pg', "~> 0.21"
     gem 'sqlite3', '>= 1.3'
   end
 end

gemfiles/rails_4.0.gemfile

@@ -16,7 +16,7 @@ group :active_record do
 
   platforms :ruby, :mswin, :mingw do
     gem "mysql2", "~> 0.3.14"
-    gem "pg", ">= 0.14"
+    gem "pg", "~> 0.21"
     gem "sqlite3", ">= 1.3"
   end
 

gemfiles/rails_4.1.gemfile

@@ -13,7 +13,7 @@ group :active_record do
 
   platforms :ruby, :mswin, :mingw do
     gem "mysql2", "~> 0.3.14"
-    gem "pg", ">= 0.14"
+    gem "pg", "~> 0.21"
     gem "sqlite3", ">= 1.3"
   end
 

gemfiles/rails_4.2.gemfile

@@ -14,7 +14,7 @@ group :active_record do
 
   platforms :ruby, :mswin, :mingw do
     gem "mysql2", "~> 0.3.14"
-    gem "pg", ">= 0.14"
+    gem "pg", "~> 0.21"
     gem "sqlite3", ">= 1.3"
   end
 

gemfiles/rails_5.0.gemfile

@@ -13,7 +13,7 @@ group :active_record do
 
   platforms :ruby, :mswin, :mingw do
     gem "mysql2", "~> 0.3.14"
-    gem "pg", ">= 0.14"
+    gem 'pg', '~> 0.21'
     gem "sqlite3", ">= 1.3"
   end
 

gemfiles/rails_5.1.gemfile

@@ -13,7 +13,7 @@ group :active_record do
 
   platforms :ruby, :mswin, :mingw do
     gem "mysql2", "~> 0.3.14"
-    gem "pg", ">= 0.14"
+    gem 'pg', '~> 0.21'
     gem "sqlite3", ">= 1.3"
   end
 end

lib/rails_admin/adapters/active_record.rb

@@ -101,12 +101,6 @@ def initialize(scope)
 
         def add(field, value, operator)
           field.searchable_columns.flatten.each do |column_infos|
-            value =
-              if value.is_a?(Array)
-                value.map { |v| field.parse_value(v) }
-              else
-                field.parse_value(value)
-              end
             statement, value1, value2 = StatementBuilder.new(column_infos[:column], column_infos[:type], value, operator).to_statement
             @statements << statement if statement.present?
             @values << value1 unless value1.nil?
@@ -126,7 +120,8 @@ def build
       def query_scope(scope, query, fields = config.list.fields.select(&:queryable?))
         wb = WhereBuilder.new(scope)
         fields.each do |field|
-          wb.add(field, field.parse_value(query), field.search_operator)
+          value = parse_field_value(field, query)
+          wb.add(field, value, field.search_operator)
         end
         # OR all query statements
         wb.build

lib/rails_admin/config/fields/types/active_record_enum.rb

@@ -30,14 +30,20 @@ def type
           def parse_value(value)
             return unless value.present?
             if ::Rails.version >= '5'
-              abstract_model.model.attribute_types[name.to_s].deserialize(value)
+              abstract_model.model.attribute_types[name.to_s].serialize(value)
             else
-              enum.invert[type_cast_value(value)]
+              # Depending on the colum type and AR version, we might get a
+              # string or an integer, so we need to handle both cases.
+              enum.fetch(value) do
+                type_cast_value(value)
+              end
             end
           end
 
           def parse_input(params)
-            params[name] = parse_value(params[name]) if params[name]
+            value = params[name]
+            return unless value
+            params[name] = parse_input_value(value)
           end
 
           def form_value
@@ -46,6 +52,14 @@ def form_value
 
         private
 
+          def parse_input_value(value)
+            if ::Rails.version >= '5'
+              abstract_model.model.attribute_types[name.to_s].deserialize(value)
+            else
+              enum.invert[type_cast_value(value)]
+            end
+          end
+
           def type_cast_value(value)
             if ::Rails.version >= '4.2'
               abstract_model.model.column_types[name.to_s].type_cast_from_user(value)

spec/dummy_app/Gemfile

@@ -15,7 +15,7 @@ group :active_record do
 
   platforms :ruby, :mswin, :mingw do
     gem 'mysql2', '~> 0.3.14'
-    gem 'pg', '>= 0.14'
+    gem 'pg', '~> 0.21'
     gem 'sqlite3', '>= 1.3'
   end
 

spec/dummy_app/app/active_record/field_test.rb

@@ -13,4 +13,9 @@ class FieldTest < ActiveRecord::Base
   mount_uploader :carrierwave_asset, CarrierwaveUploader
 
   attachment :refile_asset if defined?(Refile)
+
+  if ::Rails.version >= '4.1' # enum support was added in Rails 4.1
+    enum size_string_enum: {S: 's', M: 'm', L: 'l'}
+    enum size_integer_enum: [:small, :medium, :large]
+  end
 end

spec/dummy_app/db/migrate/20171229220713_add_size_enum_to_field_tests.rb

@@ -0,0 +1,6 @@
+class AddSizeEnumToFieldTests < MigrationBase
+  def change
+    add_column :field_tests, :size_string_enum,  :string
+    add_column :field_tests, :size_integer_enum, :integer
+  end
+end

spec/rails_admin/abstract_model_spec.rb

@@ -18,6 +18,46 @@
       end
     end
 
+    context 'on ActiveRecord native enum' do
+      shared_examples "filter on enum" do
+        before do
+          ["S", "M", "L"].each do |size|
+            FactoryGirl.create(:field_test, size_string_enum: size)
+          end
+
+          ["small", "medium", "large"].each do |size|
+            FactoryGirl.create(:field_test, size_integer_enum: size)
+          end
+        end
+        let(:model) { RailsAdmin::AbstractModel.new('FieldTest') }
+        let(:filters) { {enum_field => {'1' => {v: filter_value, o: 'is'}}} }
+        subject(:elements) {  model.all(filters: filters) }
+
+        it 'lists elements by value' do
+          expect(elements.count).to eq(expected_elements_count)
+          expect(elements.map(&enum_field.to_sym)).to all(eq(enum_label))
+        end
+      end
+
+      context "when enum is integer enum" do
+        it_behaves_like "filter on enum" do
+          let(:filter_value) { 0 }
+          let(:enum_field) { "size_integer_enum" }
+          let(:enum_label) { 'small' }
+          let(:expected_elements_count) { 1 }
+        end
+      end
+
+      context "when enum is string enum where label <> value" do
+        it_behaves_like "filter on enum" do
+          let(:filter_value) { 's' }
+          let(:enum_field) { "size_string_enum" }
+          let(:enum_label) { 'S' }
+          let(:expected_elements_count) { 1 }
+        end
+      end
+    end if CI_ORM == :active_record && ::Rails.version >= '4.1'
+
     context 'on dates with :en locale' do
       before do
         [Date.new(2012, 1, 1), Date.new(2012, 1, 2), Date.new(2012, 1, 3), Date.new(2012, 1, 4)].each do |date|