Rails active record object save action fails because of a malformed query - mysql

Question

I have a problem in Rails in the part of my app that handles landing pages for registration emails. When a user is invited to the app, an Invitation active record instance is created, and user is sent an email with a link containing the id of the invitation (a random string token).
Then, when the link is clicked, I store that token in session, and at one point in the service layer, I update it's 'status' attribute to 'clicked', something like this:
#invitation = Invitation.find_by_id(session[:registration][:invitation_token])
unless #invitation.blank?
session[:registration][:account_details]['referer'] = #invitation.promoter.username
unless #invitation.status == APP_CONFIG['invitation_status']['clicked']
#invitation.status = APP_CONFIG['invitation_status']['clicked']
#invitation.save
end
end
Upon executing the #invitation.save line, I get an active record error:
!! #<ActiveRecord::StatementInvalid: Mysql2::Error: Unknown column 'invitations.' in 'where clause': UPDATE `invitations` SET `status` = 'clicked', `updated_at` = '2015-11-11 11:07:24' WHERE `invitations`.`` = 'fd05ee5a-e790-48cc-9e7e-d30d3e88919b'>
The Invitation's id column name seems to be ommited from the query for some reason, and I can't figure out why. Not sure what is wrong or what to do.
Invitation migration:
class CreateInvitations < ActiveRecord::Migration
def change
create_table :invitations, id: false do |t|
t.string :id, limit: 36, :auto_increment => false
t.string :promoter_id
t.string :email
t.string :status
t.timestamps
end
end
end
Invitation model:
class Invitation < ActiveRecord::Base
#region Callbacks
before_create :set_uid
#endregion
belongs_to :promoter, class_name: 'User', foreign_key: 'promoter_id'
private
def set_uid
self.id = SecureRandom.uuid unless self.id
end
end

Answer 1

You should mark the id column as the primary_key:
create_table :invitations, id: false do |t|
t.string :id, limit: 36, primary_key: true, auto_increment: false
...
I think that in your case the best way to solve this problem is to drop the table and create it again with correct migration. But if there is data that you don't want to loose, you can also try to do it like this:
class MarkIdAsPrimaryKey < ActiveRecord::Migration
def change
change_column :invitations, :id, :string, limit: 36, primary_key: true, auto_increment: false
end
end
Keep in mind that this migration is not reversible, it remains under your responsibility if you will use it ) Good luck !