Writing a gem with bundler gem

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Writing a gem with bundler gem

The first thing to generate for a blog engine is the Article model and related controller. To quickly generate this, you can use the Rails scaffold generator.

This line is simply resources: Engine object rather than the YourApp:: This is so that the engine routes are confined to the engine itself and can be mounted at a specific point as shown in the test directory section. The Routes section of this guide describes it in detail. Everything this generator has created is neatly namespaced.

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Finally, the assets for this resource are generated in two files: When you open http: Whenever someone goes to the root path where the engine is mounted, they should be shown a list of articles.

This means that instead of http: From the application root, run the model generator. Tell it to generate a Comment model, with the related table having two columns: Next, there needs to be a form so that comments can be created on an article.

To add this, put this line underneath the call to render article. The route now exists, but the controller that this route goes to does not. To create it, run this command from the application root: Displaying the comments, however, is not quite right yet.

If you were to create a comment right now, you would see this error: This partial will be responsible for rendering just the comment text, for now. That completes the comment function of the blogging engine. This section covers how to mount the engine into an application and the initial setup required, as well as linking the engine to a User class provided by the application to provide ownership for articles and comments within the engine.

As described earlier, by placing the gem in the Gemfile it will be loaded when Rails is loaded. Making it accessible at http: The first run for this command will output something such as this: The reason for this is so that the migrations for the engine are run after any existing migrations in the application.

When accessing the engine through http: This is because the table created inside the application is different from the one created within the engine. Go ahead, play around with the newly mounted engine. To revert all migrations from blorgh engine you can run code such as: In the case of the blorgh engine, making articles and comments have authors would make a lot of sense.

A typical application might have a User class that would be used to represent authors for an article or a comment.

writing a gem with bundler gem

But there could be a case where the application calls this class something different, such as Person. For this reason, the engine should not hardcode associations specifically for a User class.

writing a gem with bundler gem

It can be generated using this command inside the application: The engine will then take this name and either create a new User object from it, or find one that already has that name. The engine will then associate the article with the found or created User object.

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This can be added above the title field with this code:Now re-install your dependencies (to generate a new rutadeltambor.com): $ bundle install For more information on why Postgres is recommended instead of Sqlite3, see why you cannot use Sqlite3 on Heroku..

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Local Workstation Setup

I am trying to run mysql client on my terminal. I have installed the latest mysql gem. ~ git:(master) ruby -v ruby ( patchlevel ) [universal-darwin] ~ git.

Please enable javascript Ruby on Rails is a popular web framework written in Ruby. This guide covers using Rails 5 on Heroku.
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