Merge pull request rails#35429 from jhawthorn/template_format_nil

Allow nil format on templates

actionmailer/lib/action_mailer/base.rb

@@ -973,10 +973,11 @@ def collect_responses_from_templates(headers)
         templates_name = headers[:template_name] || action_name
 
         each_template(Array(templates_path), templates_name).map do |template|
-          self.formats = [template.format]
+          format = template.format || self.formats.first
+          self.formats = [format]
           {
             body: render(template: template),
-            content_type: template.type.to_s
+            content_type: Mime[format].to_s
           }
         end
       end

actionview/lib/action_view/rendering.rb

@@ -118,7 +118,8 @@ def _render_template(options)
           renderer.render_to_object(context, options)
         end
 
-        @rendered_format = Template::Types[rendered_template.format]
+        rendered_format = rendered_template.format || lookup_context.formats.first
+        @rendered_format = Template::Types[rendered_format]
 
         rendered_template.body
       end

actionview/lib/action_view/template.rb

@@ -126,11 +126,6 @@ def self.finalize_compiled_template_methods=(_)
     attr_reader :variable, :format, :variant, :locals, :virtual_path
 
     def initialize(source, identifier, handler, format: nil, variant: nil, locals: nil, virtual_path: nil, updated_at: Time.now)
-      unless format
-        ActiveSupport::Deprecation.warn "ActionView::Template#initialize requires a format parameter"
-        format = :html
-      end
-
       unless locals
         ActiveSupport::Deprecation.warn "ActionView::Template#initialize requires a locals parameter"
         locals = []

actionview/lib/action_view/template/resolver.rb

@@ -212,7 +212,7 @@ def query(path, details, formats, outside_app_allowed, locals)
         template_paths = reject_files_external_to_app(template_paths) unless outside_app_allowed
 
         template_paths.map do |template|
-          handler, format, variant = extract_handler_and_format_and_variant(template, formats.first)
+          handler, format, variant = extract_handler_and_format_and_variant(template)
 
           FileTemplate.new(File.expand_path(template), handler,
             virtual_path: path.virtual,
@@ -280,7 +280,7 @@ def mtime(p)
       # Extract handler, formats and variant from path. If a format cannot be found neither
       # from the path, or the handler, we should return the array of formats given
       # to the resolver.
-      def extract_handler_and_format_and_variant(path, query_format)
+      def extract_handler_and_format_and_variant(path)
         pieces = File.basename(path).split(".")
         pieces.shift
 
@@ -294,12 +294,12 @@ def extract_handler_and_format_and_variant(path, query_format)
           if handler.respond_to?(:default_format) # default_format can return nil
             handler.default_format
           else
-            query_format
+            nil
           end
         end
 
         # Template::Types[format] and handler.default_format can return nil
-        [handler, format || query_format, variant]
+        [handler, format, variant]
       end
   end
 

actionview/lib/action_view/testing/resolvers.rb

@@ -34,7 +34,7 @@ def query(path, exts, _, _, locals)
         @hash.each do |_path, array|
           source, updated_at = array
           next unless query.match?(_path)
-          handler, format, variant = extract_handler_and_format_and_variant(_path, :html)
+          handler, format, variant = extract_handler_and_format_and_variant(_path)
           templates << Template.new(source, _path, handler,
             virtual_path: path.virtual,
             format: format,
@@ -50,7 +50,7 @@ def query(path, exts, _, _, locals)
 
   class NullResolver < PathResolver
     def query(path, exts, _, _, locals)
-      handler, format, variant = extract_handler_and_format_and_variant(path, :html)
+      handler, format, variant = extract_handler_and_format_and_variant(path)
       [ActionView::Template.new("Template generated by Null Resolver", path.virtual, handler, virtual_path: path.virtual, format: format, variant: variant, locals: locals)]
     end
   end

actionview/test/template/lookup_context_test.rb

@@ -121,11 +121,11 @@ def teardown
     assert_equal "Hello texty phone!", template.source
   end
 
-  test "found templates respects given formats if one cannot be found from template or handler" do
+  test "found templates have nil format if one cannot be found from template or handler" do
     assert_called(ActionView::Template::Handlers::Builder, :default_format, returns: nil) do
       @lookup_context.formats = [:text]
       template = @lookup_context.find("hello", %w(test))
-      assert_equal :text, template.format
+      assert_nil template.format
     end
   end
 

actionview/test/template/resolver_patterns_test.rb

@@ -19,7 +19,7 @@ def test_should_return_template_for_declared_path
     assert_equal 1, templates.size, "expected one template"
     assert_equal "Hello custom patterns!", templates.first.source
     assert_equal "custom_pattern/path",    templates.first.virtual_path
-    assert_equal :html,                    templates.first.format
+    assert_nil templates.first.format
   end
 
   def test_should_return_all_templates_when_ambiguous_pattern

actionview/test/template/testing/fixture_resolver_test.rb

@@ -15,6 +15,6 @@ def test_should_return_template_for_declared_path
     assert_equal 1, templates.size, "expected one template"
     assert_equal "this text",      templates.first.source
     assert_equal "arbitrary/path", templates.first.virtual_path
-    assert_equal :html,            templates.first.format
+    assert_nil templates.first.format
   end
 end

actionview/test/template/testing/null_resolver_test.rb

@@ -9,6 +9,6 @@ def test_should_return_template_for_any_path
     assert_equal 1, templates.size, "expected one template"
     assert_equal "Template generated by Null Resolver", templates.first.source
     assert_equal "arbitrary/path.erb", templates.first.virtual_path.to_s
-    assert_equal :html, templates.first.format
+    assert_nil templates.first.format
   end
 end