PG::UndefinedColumn: ERROR: column courts.user_id does not exist - ruby-on-rails

Question

This is the error I receive when I run a test for this file.
The error is in line 83 when I attempt to remove the user from the database using the 'destroy' method.
This is the repo in question frozen in time.
The error:
ActiveRecord::StatementInvalid:
PG::UndefinedColumn: ERROR: column courts.user_id does not exist
LINE 1: SELECT "courts".* FROM "courts" WHERE "courts"."user_id" = $...
I'm trying to connect the table users with the table court this way:
User is the administrator of many courts
A court can have only one administrator
As you can see, 'Court' has a foreign key linked to 'users', but called 'administrator'.
I want 'administrator' to be the alias of a user because in the future User and Court might have more relationships: 'owner' for example.
I can see that active record is building this query:
SELECT "courts".* FROM "courts" WHERE "courts"."user_id" = $...
Maybe this can be solved if Active Record build a query this way
SELECT "courts".* FROM "courts" WHERE "courts"."administrator_id" = $...
But I don't know how to do it and if that would be prudent.
Maybe there is another way to do this. Something tidier, I feel I'm not doing the association properly.
What do you recommend?
models/user.rb
class User < ActiveRecord::Base
before_save :format_input
# extend Devise::Models
# Include default devise modules .
devise :database_authenticatable,
# :validatable,
# :recoverable,
# :rememberable,
# :trackable,
# :confirmable,
# :omniauthable,
:registerable
# note that this include statement comes AFTER the devise block above
include DeviseTokenAuth::Concerns::User
validates :first_name, presence: true, length: { in: 1..20 }
validates :last_name, presence: true, length: { in: 1..20 }
validates :email, uniqueness: true
validates_format_of :email, with: /#/
validates :password, presence: true, length: { in: 8..20 }, :on => :create
has_many :courts, dependent: :destroy
private
def format_input
self.first_name = first_name.downcase.titleize
self.last_name = last_name.downcase.titleize
self.email = email.downcase
end
end
models/court.rb
class Court < ApplicationRecord
belongs_to :administrator, :class_name => :user
validates :name, presence: true, length: { in: 1..20 }
validates :address, presence: true, length: { in: 1..50 }
validates :description, presence: true, length: { in: 1..100 }
validates :description, presence: true, length: { in: 1..100 }
end

Answer 1

The issue is on this line.
has_many :courts, dependent: :destroy
By default, ActiveRecord assumes the foreign key is named <lowercased_parent_class_name>_id. In this case, when you delete a user, ActiveRecord is trying to delete the associated courts using the user_id foreign key which doesn't exist. Pass the foreign_key option to the has_many call.
has_many :courts, dependent: :destroy, foreign_key: :administrator_id
From the docs:
:foreign_key
Specify the foreign key used for the association. By default this is guessed to be the name of this class in lower-case and _id suffixed. So a Person class that makes a has_many association will use person_id as the default :foreign_key.
There's another issue. You should pass the uppercased class name as a string in the belongs_to call in the Court model.
belongs_to :administrator, class_name: 'User'
This is unrelated to the question but you might want to check if it is okay to delete a court when the user record is deleted.