Adds default trix partial

actiontext/lib/action_text/attachable.rb

@@ -67,6 +67,10 @@ module ActionText
       super.merge(attachable_sgid: attachable_sgid)
     end
 
+    def to_trix_content_attachment_partial_path
+      to_partial_path
+    end
+
     def to_rich_text_attributes(attributes = {})
       attributes.dup.tap do |attrs|
         attrs[:sgid] = attachable_sgid

actiontext/test/dummy/app/models/page.rb

@@ -0,0 +1,4 @@
+class Page < ApplicationRecord
+  include ActionText::Attachable
+end
+

actiontext/test/dummy/db/migrate/20190305172303_create_pages.rb

@@ -0,0 +1,9 @@
+class CreatePages < ActiveRecord::Migration[6.0]
+  def change
+    create_table :pages do |t|
+      t.string :title
+
+      t.timestamps
+    end
+  end
+end

actiontext/test/dummy/db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2018_10_03_185713) do
+ActiveRecord::Schema.define(version: 2019_03_05_172303) do
 
   create_table "action_text_rich_texts", force: :cascade do |t|
     t.string "name", null: false
@@ -49,6 +49,12 @@ ActiveRecord::Schema.define(version: 2018_10_03_185713) do
     t.datetime "updated_at", precision: 6, null: false
   end
 
+  create_table "pages", force: :cascade do |t|
+    t.string "title"
+    t.datetime "created_at", precision: 6, null: false
+    t.datetime "updated_at", precision: 6, null: false
+  end
+
   create_table "people", force: :cascade do |t|
     t.string "name"
     t.datetime "created_at", precision: 6, null: false

actiontext/test/unit/attachment_test.rb

@@ -32,7 +32,8 @@ class ActionText::AttachmentTest < ActiveSupport::TestCase
     assert_equal attachable.byte_size, trix_attachment.attributes["filesize"]
     assert_equal "Captioned", trix_attachment.attributes["caption"]
 
-    assert_nil trix_attachment.attributes["content"]
+    assert_not_nil attachable.to_trix_content_attachment_partial_path
+    assert_not_nil trix_attachment.attributes["content"]
   end
 
   test "converts to TrixAttachment with content" do
@@ -49,6 +50,11 @@ class ActionText::AttachmentTest < ActiveSupport::TestCase
     assert_not_nil trix_attachment.attributes["content"]
   end
 
+  test "defaults trix partial to model partial" do
+    attachable = Page.create! title: "Homepage"
+    assert_equal "pages/page", attachable.to_trix_content_attachment_partial_path
+  end
+
   private
     def attachment_from_html(html)
       ActionText::Content.new(html).attachments.first