RoR: NoMethodError when executing delete_all for a has_many relationship

Question

My classes are as follows, with Customer inheriting from User using the single-table inheritance approach. User has attributes name and email while Order has destination.

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Answer 1

It seems you have no inverse associations and Rails fails to resolve the order's customer when updating the cached counters. Try this:

class Customer < User
  has_many :orders, inverse_of: :customer
end

class Order < ActiveRecord::Base
  belongs_to :customer, inverse_of: :orders
end

Answer 2

for delete_all

for example

 Post.delete_all("person_id = 5 AND (category = 'Something' OR category = 'Else')")
  Post.delete_all(["person_id = ? AND (category = ? OR category = ?)", 5, 'Something', 'Else'])

for destroy_all

for example

 Person.destroy_all("last_login < '2004-04-04'")
  Person.destroy_all(:status => "inactive")

Answer 3

I guess you were right about the problem about the ruby version. I found this question.

The guy had a similar problem and he fixed it by switching his ruby version from ruby-2.2.0 to ruby-2.1.1.

If it's not the ruby version, it could be the ActiveRecord Version.

Answer 4

This is the Rails issue with Ruby 2.2.2: https://github.com/rails/rails/issues/18991 . It's closed and fixed in 3.2.22).

Answer 5

Try updating you Customer class association with

has_many :orders, :dependent => :destroy

or

has_many :orders, :dependent => :delete_all

Depending on what you want to achieve.

:destroy causes all the associated objects to also be destroyed.

:delete_all causes all the associated objects to be deleted directly from the database without executing callbacks.