Add :translate setting for include_blank and prompt

lib/simple_form/inputs/collection_input.rb

@@ -19,7 +19,13 @@ module SimpleForm
 
       def input_options
         options = super
+
         options[:include_blank] = true unless skip_include_blank?
+
+        [:prompt, :include_blank].each do |key|
+          options[key] = translate(key, true) if options[key] == :translate
+        end
+
         options
       end
 

test/inputs/collection_select_input_test.rb

@@ -96,6 +96,51 @@ class CollectionSelectInputTest < ActionView::TestCase
     assert_select 'select option[value=]', ''
   end
 
+  test 'input should translate include blank when set to :translate' do
+    store_translations(:en, :simple_form => { :include_blank => { :user => {
+      :age => 'Rather not say'
+    } } } ) do
+      with_input_for @user, :age, :select, :collection => 18..30, :include_blank => :translate
+      assert_select 'select option[value=]', 'Rather not say'
+    end
+  end
+
+  test 'input should not translate include blank when set to a string' do
+    store_translations(:en, :simple_form => { :include_blank => { :user => {
+      :age => 'Rather not say'
+    } } } ) do
+      with_input_for @user, :age, :select, :collection => 18..30, :include_blank => 'Young at heart'
+      assert_select 'select option[value=]', 'Young at heart'
+    end
+  end
+
+  test 'input should not translate include blank when automatically set' do
+    store_translations(:en, :simple_form => { :include_blank => { :user => {
+      :age => 'Rather not say'
+    } } } ) do
+      with_input_for @user, :age, :select, :collection => 18..30
+      assert_select 'select option[value=]', ''
+    end
+  end
+
+  test 'input should not translate include blank when set to true' do
+    store_translations(:en, :simple_form => { :include_blank => { :user => {
+      :age => 'Rather not say'
+    } } } ) do
+      with_input_for @user, :age, :select, :collection => 18..30, :include_blank => true
+      assert_select 'select option[value=]', ''
+    end
+  end
+
+  test 'input should not translate include blank when set to false' do
+    store_translations(:en, :simple_form => { :include_blank => { :user => {
+      :age => 'Rather not say'
+    } } } ) do
+      with_input_for @user, :age, :select, :collection => 18..30, :include_blank => false
+      assert_no_select 'select option[value=]'
+    end
+  end
+
   test 'input should not set include blank if otherwise is told' do
     with_input_for @user, :age, :select, collection: 18..30, include_blank: false
     assert_no_select 'select option[value=]', ''
@@ -111,6 +156,42 @@ class CollectionSelectInputTest < ActionView::TestCase
     assert_no_select 'select option[value=]', ''
   end
 
+  test 'input should translate prompt when set to :translate' do
+    store_translations(:en, :simple_form => { :prompt => { :user => {
+      :age => 'Select age:'
+    } } } ) do
+      with_input_for @user, :age, :select, :collection => 18..30, :prompt => :translate
+      assert_select 'select option[value=]', 'Select age:'
+    end
+  end
+
+  test 'input should not translate prompt when set to a string' do
+    store_translations(:en, :simple_form => { :prompt => { :user => {
+      :age => 'Select age:'
+    } } } ) do
+      with_input_for @user, :age, :select, :collection => 18..30, :prompt => 'Do it:'
+      assert_select 'select option[value=]', 'Do it:'
+    end
+  end
+
+  test 'input should not translate prompt when set to false' do
+    store_translations(:en, :simple_form => { :prompt => { :user => {
+      :age => 'Select age:'
+    } } } ) do
+      with_input_for @user, :age, :select, :collection => 18..30, :prompt => false
+      assert_no_select 'select option[value=]'
+    end
+  end
+
+  test 'input should use Rails prompt translation as a fallback' do
+    store_translations(:en, :helpers => { :select => {
+      :prompt => 'Select value:'
+    } } ) do
+      with_input_for @user, :age, :select, :collection => 18..30, :prompt => :translate
+      assert_select 'select option[value=]', "Select value:"
+    end
+  end
+
   test 'input should detect label and value on collections' do
     users = [ setup_new_user(id: 1, name: "Jose"), setup_new_user(id: 2, name: "Carlos") ]
     with_input_for @user, :description, :select, collection: users