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MTI is a gem designed to allow Multiple Table Inheritance for Rails Application. This will give us the previlage to access or assign sub-model attributes from parent model .
Like has_one association has_subclass also follows one_to_one mapping. This method should only be used if the other class contains the foreign key.
Use joins to query through this association.
eg: ParenModel.joins(:child_model).where(child_model: {abc: 'xyz'})
Add this to line gem list and run bundle install
$ gem `mti`
Run this command in terminal
$ rails g mti:install
To create a SubClass run command
$ rails g mti:subclass ChildModel ParentModel
Add has_subclass association to ParentModel
$ has_subclass :child_model
If you are using this gem for the first time please do a migration for our dummy app.
$ cd test/dummy/app/ && rake db:migrate
Once done with the migration go back to the gem root directory then:
$ rake test
That’s all! you are ready to go… :)