This gem allows you to use destroy? for rails ActiveRecord models checking to see if a record can be destroyed.

Usage

Example scenario:

class User < ApplicationRecord
  has_many :posts, dependent: :destroy
end

class Post < ApplicationRecord
  belongs_to :user

  has_many :comments, dependent: :restrict_with_error
end

class Comment < ApplicationRecord
  belongs_to :post
end

Calling destroy will not return the expected Post error Cannot delete record because dependent comments exist:

user = User.find(1)
if !user.destroy # => false
  puts user.errors.full_messages.to_sentence # => ""
end

Calling destroy? will:

user = User.find(1)
if user.destroy? # => false
  user.destroy # => true
else
  puts user.errors.full_messages.to_sentence # => Cannot delete record because dependent comments exist
end

Installation

Add this line to your application's Gemfile:

gem 'activerecord-destroyable', '~> 0.1.0'

And then execute:

$ bundle update

Or install it yourself as:

$ gem install activerecord-destroyable

Real talk

Ideally a consistent design pattern should be encouraged. If you are running into the usage scenario then you should probably use :restrict_with_error to prevent the scenario e.g.

class User < ApplicationRecord
  has_many :posts, dependent: :restrict_with_error
end

class Post < ApplicationRecord
  belongs_to :user

  has_many :comments, dependent: :restrict_with_error
end

class Comment < ApplicationRecord
  belongs_to :post
end

I have yet to use this on a production application!

License

The gem is available as open source under the terms of the MIT License.