Merge branch 'form_title' of https://github.com/timoschilling/activeadmin

Author: seanlinsley

docs/5-forms.md

@@ -6,7 +6,7 @@ a thin DSL on top of [Formtastic](https://github.com/justinfrench/formtastic):
 ```ruby
 ActiveAdmin.register Post do
 
-  form do |f|
+  form title: 'A custom title' do |f|
     inputs 'Details' do
       input :title
       input :published_at, label: "Publish Post At"

lib/active_admin/views/pages/form.rb

@@ -5,8 +5,12 @@ module Pages
       class Form < Base
 
         def title
-          assigns[:page_title] || I18n.t("active_admin.#{normalized_action}_model",
-                                         model: active_admin_config.resource_label)
+          if form_presenter[:title]
+            render_or_call_method_or_proc_on(resource, form_presenter[:title])
+          else
+            assigns[:page_title] || I18n.t("active_admin.#{normalized_action}_model",
+                                      model: active_admin_config.resource_label)
+          end
         end
 
         def form_presenter

spec/unit/views/pages/form_spec.rb

@@ -16,6 +16,15 @@
       OpenStruct.new(params: params, helpers: helpers, assigns: {})
     end
 
+    context "when :title is set" do
+      it "should show the set page title" do
+        page = ActiveAdmin::Views::Pages::Form.new(arbre_context)
+        expect(page).to receive(:resource)
+        expect(page).to receive(:form_presenter).twice.and_return({ title: "My Page Title" })
+        expect(page.title).to eq "My Page Title"
+      end
+    end
+
     context "when page_title is assigned" do
       it "should show the set page title" do
         arbre_context.assigns[:page_title] = "My Page Title"