Creating models and migrations for the engine

Question

So, I'm working on a new project that seems like a great choice to use the new Engine functionality. This, as the engines say, is its own application, with its own representations and controllers and models. Here, where I am a little behind.

I create my test application in which I can install a new engine.

rails new engine_app && cd engine_app 

Then create a new engine

 rails plugin new my_engine --mountable 

Then I add "gem" to the gemfile engine_app

 gem 'my_engine', :path => './my_engine' 

Then I mount the engine in the engine_app routes so

 mount MyEngine::Engine, :at => '/my_engine' 

Then I write cd to my_engine dummy app and run

 rails generate model MyModel title:string body:text 

Here, where I run into confusion. From what I understand, this should create a namespace table (I think it will be my_engine_my_model). The table in the migration file is just my_model.

Secondly, how do I perform this migration and is the migration file valid only for calling the table: my_model? I tried to run the following, but nothing happens, and I checked the database and the table is not there.

So, to understand, I need to know how to create migrations in the engine, and be able to correctly run them in the database of the parent applications.

Thanks for any help and recommendations.

Answer 1

So, all the tutorials read did not indicate that you need to run script / rails from the root level of your engine. I continued to see links telling me to go to the test / dummy application. After running script / rails, generate the [field] model from the root of my engine, it created a suitable model, the rake migration task and I was able to run

 rake my_engine:install:migrations; rake db:migrate 

to start the migration