Requiring User to Select Categories -- (on Post Creation)

Hello,

I’m having trouble with validation. I want to require the user to select
a category before a post is successfully created.

I’m using has_many :through for posts and categories as follows:

class Post < ActiveRecord::Base
has_many :categorizations
has_many :categories, :through => :categorizations
end

class Categorization < ActiveRecord::Base
belongs_to :category
belongs_to :post
end

class Category < ActiveRecord::Base
has_many :categorizations
has_many :posts, :through => :categorizations
end

I’ve tried validates_presence_of :categorizations in the Post model, but
the application simply saves it without verifying that the user selected
a checkbox.

Any ideas what I can do?

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