Add has_one support to format_association

app/helpers/format_helper.rb

@@ -98,8 +98,9 @@ def format_with_helper(obj, attr)
   # Checks whether the given attr is an association of obj and formats it
   # accordingly if it is.
   def format_association(obj, attr)
-    belongs_to = association(obj, attr, :belongs_to)
+    belongs_to = association(obj, attr, :belongs_to, :has_one)
     has_many = association(obj, attr, :has_many, :has_and_belongs_to_many)
+
     if belongs_to
       format_belongs_to(obj, belongs_to)
     elsif has_many
@@ -129,7 +130,7 @@ def format_type(obj, attr)
     end
   end
 
-  # Formats an ActiveRecord +belongs_to+ association
+  # Formats an ActiveRecord +belongs_to+ or +has_one+ association.
   def format_belongs_to(obj, assoc)
     val = obj.send(assoc.name)
     if val

lib/generators/dry_crud/templates/spec/helpers/format_helper_spec.rb

@@ -155,6 +155,16 @@ def format_string_size(obj) #:nodoc:
       expect(string).to eq('AAAAA')
     end
 
+    it 'formats empty has_one' do
+      expect(format_attr(crud_test_models(:FFFFF), :comrad)).to eq(
+        t('global.associations.no_entry'))
+    end
+
+    it 'formats existing has_one' do
+      string = format_attr(crud_test_models(:AAAAA), :comrad)
+      expect(string).to eq('BBBBB')
+    end
+
     it 'formats existing has_many' do
       string = format_attr(crud_test_models(:CCCCC), :others)
       expect(string).to be_html_safe

lib/generators/dry_crud/templates/test/helpers/format_helper_test.rb

@@ -159,6 +159,17 @@ def format_string_size(obj)
     assert_equal 'AAAAA', format_attr(m, :companion)
   end
 
+  test 'format has one without content' do
+    m = crud_test_models(:FFFFF)
+    assert_equal t('global.associations.no_entry'),
+                 format_attr(m, :comrad)
+  end
+
+  test 'format has one with content' do
+    m = crud_test_models(:AAAAA)
+    assert_equal 'BBBBB', format_attr(m, :comrad)
+  end
+
   test 'format has_many column with content' do
     m = crud_test_models(:CCCCC)
     assert_equal '<ul><li>AAAAA</li><li>BBBBB</li></ul>',

lib/generators/dry_crud/templates/test/support/crud_test_model.rb

@@ -8,6 +8,8 @@ class CrudTestModel < ActiveRecord::Base #:nodoc:
   has_many :mores, class_name: 'OtherCrudTestModel',
                    foreign_key: :more_id
 
+  has_one :comrad, class_name: 'CrudTestModel', foreign_key: :companion_id
+
   before_destroy :protect_if_companion
 
   validates :name, presence: true