Raise ArgumentError if :renderable object does not respond to #render_in

When calling `render` with a `:renderable` argument, ensure that the
object responds to `#render_in`. If it doesn't, raise an
`ArgumentError`.

This commit also adjusts the `ArgumentError` that when a `:partial`
argument isn't Active Model compatible. Prior to this commit, the
message used `:` as a prefix to `to_partial_path`. This commit replaces
that with a `#` prefix to denote that it's expected to be an instance
method on the object.

Author: seanpdoyle

actionview/CHANGELOG.md

@@ -1,3 +1,7 @@
+*   Raise `ArgumentError` if `:renderable` object does not respond to `#render_in`
+
+    *Sean Doyle*
+
 *   Add the `nonce: true` option for `stylesheet_link_tag` helper to support automatic nonce generation for Content Security Policy.
     Works the same way as `javascript_include_tag nonce: true` does.
 

actionview/lib/action_view/renderer/abstract_renderer.rb

@@ -79,7 +79,7 @@ def partial_path(object, view)
           path = if object.respond_to?(:to_partial_path)
             object.to_partial_path
           else
-            raise ArgumentError.new("'#{object.inspect}' is not an ActiveModel-compatible object. It must implement :to_partial_path.")
+            raise ArgumentError.new("'#{object.inspect}' is not an ActiveModel-compatible object. It must implement #to_partial_path.")
           end
 
           if view.prefix_partial_path_with_controller_namespace

actionview/lib/action_view/template/renderable.rb

@@ -14,6 +14,8 @@ def identifier
 
       def render(context, *args)
         @renderable.render_in(context)
+      rescue NoMethodError
+        raise ArgumentError, "'#{@renderable.inspect}' is not a renderable object. It must implement #render_in."
       end
 
       def format

actionview/test/template/render_test.rb

@@ -293,8 +293,23 @@ def test_render_partial_with_missing_filename
   end
 
   def test_render_partial_with_incompatible_object
-    e = assert_raises(ArgumentError) { @view.render(partial: nil) }
-    assert_equal "'#{nil.inspect}' is not an ActiveModel-compatible object. It must implement :to_partial_path.", e.message
+    assert_raises ArgumentError, match: "'#{nil.inspect}' is not an ActiveModel-compatible object. It must implement #to_partial_path." do
+      @view.render(partial: nil)
+    end
+  end
+
+  def test_render_renderable_with_nil
+    assert_raises ArgumentError, match: "'#{nil.inspect}' is not a renderable object. It must implement #render_in." do
+      @view.render renderable: nil
+    end
+  end
+
+  def test_render_renderable_with_incompatible_object
+    object = Object.new
+
+    assert_raises ArgumentError, match: "'#{object.inspect}' is not a renderable object. It must implement #render_in." do
+      @view.render renderable: object
+    end
   end
 
   def test_render_partial_starting_with_a_capital