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- class Category < ActiveRecord::Base
- belongs_to :user
- belongs_to :group
- validates :name, presence: true
- validates :user_id, presence: true
- validates_presence_of :group
- .
- .
- .
- validates :group, :presence: true, if: "group_id.present?"
- validates_presence_of :group, unless: Proc.new { |category| category.group_id.nil? }
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