Lookup errors in associations.

lib/simple_form/components/base.rb

@@ -9,7 +9,7 @@ module SimpleForm
     # of prepending the content available in the method content.
     class Base
       delegate :template, :object, :object_name, :attribute, :column,
-               :input_type, :options, :to => :@builder
+               :reflection, :input_type, :options, :to => :@builder
 
       def self.basename
         @basename ||= name.split("::").last.underscore.to_sym

lib/simple_form/components/error.rb

@@ -9,11 +9,19 @@ module SimpleForm
       end
 
       def errors
-        @errors ||= object.errors[attribute]
+        @errors ||= (errors_on_attribute + errors_on_association).compact
+      end
+
+      def errors_on_attribute
+        Array(object.errors[attribute])
+      end
+
+      def errors_on_association
+        reflection ? Array(object.errors[reflection.name]) : []
       end
 
       def content
-        component_tag Array(errors).to_sentence
+        component_tag errors.to_sentence
       end
     end
   end

lib/simple_form/form_builder.rb

@@ -1,14 +1,15 @@
 module SimpleForm
   class FormBuilder < ActionView::Helpers::FormBuilder
-    attr_reader :template, :object_name, :object, :attribute, :column, :input_type, :options
+    attr_reader :template, :object_name, :object, :attribute, :column,
+                :reflection, :input_type, :options
 
     TERMINATOR = lambda { "" }
 
-    # Basic input helper, combines all components in the stack to generate input
-    # html  based on options the user define and some guesses through
+    # Basic input helper, combines all components in the stack to generate
+    # input html based on options the user define and some guesses through
     # database column information. By default a call to input will generate
-    # label + input + hint (when defined) + errors (when exists), and all can be
-    # configured inside a wrapper html.
+    # label + input + hint (when defined) + errors (when exists), and all can
+    # be configured inside a wrapper html.
     #
     # == Examples:
     #
@@ -98,18 +99,18 @@ module SimpleForm
     def association(attribute, options={})
       raise ArgumentError, "Association cannot be used in forms not associated with an object" unless @object
 
-      association = find_association(attribute)
-      raise "Association not found #{attribute.inspect}" unless association
+      @reflection = find_association_reflection(attribute)
+      raise "Association not found #{attribute.inspect}" unless @reflection
 
-      attribute = association.options[:foreign_key] || :"#{association.name}_id"
+      attribute = @reflection.options[:foreign_key] || :"#{@reflection.name}_id"
 
       options[:collection] ||= begin
         find_options = { :conditions => options.delete(:conditions),
                          :order => options.delete(:order) }
-        association.klass.all(find_options)
+        @reflection.klass.all(find_options)
       end
 
-      input(attribute, options)
+      returning(input(attribute, options)) { @reflection = nil }
     end
 
     # Creates a button:
@@ -248,7 +249,7 @@ module SimpleForm
     end
 
     # Find association related to attribute
-    def find_association(attribute)
+    def find_association_reflection(attribute)
       @object.class.reflect_on_association(attribute) if @object.class.respond_to?(:reflect_on_association)
     end
 

test/components/error_test.rb

@@ -5,6 +5,7 @@ class ErrorTest < ActionView::TestCase
   def with_error_for(object, attribute, type, options={}, &block)
     simple_form_for object do |f|
       f.attribute  = attribute
+      f.reflection = Association.new(Company, :company, {}) if options.delete(:setup_association)
       f.input_type = type
       f.options    = options
 
@@ -46,4 +47,9 @@ class ErrorTest < ActionView::TestCase
     with_error_for @user, :name, :string, :error_html => { :id => 'error', :class => 'yay' }
     assert_select 'span#error.error.yay'
   end
+
+  test 'error should find errors on attribute and association' do
+    with_error_for @user, :company_id, :select, :setup_association => true
+    assert_select 'span.error', 'must be valid and company must be present'
+  end
 end

test/support/models.rb

@@ -64,6 +64,8 @@ class User < OpenStruct
       :name => "can't be blank",
       :description => "must be longer than 15 characters",
       :age => ["is not a number", "must be greater than 18"],
+      :company => "company must be present",
+      :company_id => "must be valid"
     }
   end
 end

test/test_helper.rb

@@ -16,7 +16,7 @@ Dir["#{File.dirname(__FILE__)}/support/**/*.rb"].each { |f| require f }
 I18n.default_locale = :en
 
 class SimpleForm::FormBuilder
-  attr_accessor :attribute, :column, :input_type, :options
+  attr_accessor :attribute, :column, :reflection, :input_type, :options
 end
 
 class ActionView::TestCase