Implements defaults options for simple_form_for.

Closes #355

with help from @hugobarauna and @rafaelfranca

CHANGELOG.rdoc

@@ -4,6 +4,7 @@
   * Add `button_class` configuration to change the class of buttons (github.com/sryche)
   * Add `disabled` class to a disabled input
   * Generate configuration file with `browser_validations` disabled
+  * `simple_form_for` allows default options for its inputs (:defaults => {})
 
 * bug fix
   * Fallback to default label when block is provided (github.com/pivotal-casebook)

README.md

@@ -97,6 +97,17 @@ It is also possible to pass any html attribute straight to the input, by using t
   <% end %>
 ```
 
+If you want to pass the same :input_html to all inputs in the form (for example, a default class), you can use the :defaults option in `simple_form_for`. Specific options in :input_html will overwrite the defaults:
+
+```erb
+  <%= simple_form_for @user, :defaults => { :class => 'default_class' } do |f| %>
+    <%= f.input :username, :input_html => { :class => 'special' } %>
+    <%= f.input :password, :input_html => { :maxlength => 20 } %>
+    <%= f.input :remember_me, :input_html => { :value => '1' } %>
+    <%= f.button :submit %>
+  <% end %>
+```
+
 Since simple_form generates a wrapper div around your label and input by default, you can pass any html attribute to that wrapper as well using the :wrapper_html option, like so:
 
 ```erb
@@ -547,4 +558,4 @@ SimpleForm has several configuration values. You can read and change them in the
 
 ## License
 
-MIT License. Copyright 2011 Plataforma Tecnologia. http://blog.plataformatec.com.br
+MIT License. Copyright 2011 Plataforma Tecnologia. http://blog.plataformatec.com.br

lib/simple_form/form_builder.rb

@@ -28,6 +28,7 @@ module SimpleForm
 
     def initialize(*) #:nodoc:
       super
+      @defaults = options[:defaults]
       @wrapper = SimpleForm.wrapper(options[:wrapper] || :default)
     end
 
@@ -97,6 +98,8 @@ module SimpleForm
     # given SimpleForm.time_zone_priority and SimpleForm.country_priority are used respectivelly.
     #
     def input(attribute_name, options={}, &block)
+      options = @defaults.deep_merge(options) if @defaults
+
       chosen =
         if name = options[:wrapper]
           name.respond_to?(:render) ? name : SimpleForm.wrapper(name)

test/form_builder/general_test.rb

@@ -259,6 +259,29 @@ class FormBuilderTest < ActionView::TestCase
     end
   end
 
+  # DEFAULT OPTIONS
+  test 'builder should receive a default argument and pass it to the inputs' do
+    concat(simple_form_for(@user, :defaults => { :input_html => { :class => 'default_class' } }) do |f|
+      f.input :name
+    end)
+    assert_select 'input.default_class'
+  end
+
+  test 'builder should receive a default argument and pass it to the inputs, respecting the specific options' do
+    concat(simple_form_for(@user, :defaults => { :input_html => { :class => 'default_class' } }) do |f|
+      f.input :name, :input_html => { :id => 'specific_id' }
+    end)
+    assert_select 'input.default_class#specific_id'
+  end
+
+  test 'builder should receive a default argument and pass it to the inputs, overwriting the defaults with specific options' do
+    concat(simple_form_for(@user, :defaults => { :input_html => { :class => 'default_class', :id => 'default_id' } }) do |f|
+      f.input :name, :input_html => { :id => 'specific_id' }
+    end)
+    assert_select 'input.default_class#specific_id'
+  end
+
+
   # WITHOUT OBJECT
   test 'builder should generate properly when object is not present' do
     with_form_for :project, :name