CODEWITHSUNDEEP
ruby-on-railsruby-on-rails-4scopehas-manybelongs-to
David Mckee
David Mckee

Reputation: 1180

How can I limit has_many to certain scopes in Rails 4?

I am setting up a situation where I only want certain scopes of my model to "has_many" of another model. As a hypothetical situation, imagine I have a model called Tree and a model called Apple. I only want tall trees to be allowed to have apples, so I scoped my tree model into tall. How can I use a has_many appropriately in this situation?

I am using Rails 4.

Sample Code

Tree.rb

scope :tall, where(:tall => true)
scope :short, where(:short => true)
has_many :apples (need to alter this line to only have this happen for :scope tall)

Apple.rb

belongs_to :tall, class_name: 'Tree'

I am unsure if the rest of the code is the right way either, so please let me know if there are any improvements I can make to it.

Upvotes: 0

Views: 120

Answers (1)

fresh5447
fresh5447

Reputation: 1340

The gem 'pundit' makes it easy to create and allow model specific and oo procedures. May be what you are looking for.

https://github.com/elabs/pundit

Upvotes: 2

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