Rails relationships that is [image: :)]
I am doing something wrong, and can't figure out what and where. I have 3 models - Command, Contact, and a joined CommandsContact via has_many through relationship, because commands_contacts table holds an extra column - notification_type, which could be either set to *host* of *service. * *Models * contact.rb This one is a special case, because it has 2 extra "virtual" relationships :host_notification_commands and :service_notification_commands, which gives me an ability to selectively get either *host* or *service* commands for a user (contact) like this: Contact.first.host_notification_commands or Contact.find(3).service_notification_commands etc. class Contact < ActiveRecord::Base has_many :commands_contacts, :inverse_of => :contact has_many :commands, :through => :commands_contacts has_many :host_notification_commands, -> { where commands_contacts: { :notification_type => 'host' } }, :through => :commands_contacts, :class_name => 'Command', :source => :command has_many :service_notification_commands, -> { where commands_contacts: { notification_type: 'service' } }, :through => :commands_contacts, :class_name => 'Command', :source => :command accepts_nested_attributes_for :host_notification_commands accepts_nested_attributes_for :service_notification_commands end command.rb class Command < ActiveRecord::Base has_many :commands_contacts, :inverse_of => :command has_many :contacts, :through => :commands_contacts accepts_nested_attributes_for :commands_contacts end commands_contracts.rb class CommandsContact < ActiveRecord::Base belongs_to :command belongs_to :contact accepts_nested_attributes_for :command accepts_nested_attributes_for :contact end So far. So good. This works as expected (i think?) as I am able to manually create relationships, as long as i have a contact and a command already. contact = Contact.first command = Command.find(7) contact.host_notification_commands << command Aaand after this things start to go down south, because a Controller, strong_parameters and accepts_nested_attributes_for come into play, and this is where I fail. My assumption is that Rails will be able to handle this for me and establish the relationship, right? def create contact = Contact.new safe_params contact.saveend Because I use accepts_nested_attributes_for, I have to append _attributes to the names of nested objects, right? So i do a simple re-assignment here and then permit them with strong_parameters. privatedef safe_params params[:contact][:host_notification_commands_attributes] = params[:contact][:host_notification_commands] params[:contact][:service_notification_commands_attributes] = params[:contact][:service_notification_commands] params.require(:contact) .permit(:contact_name, :host_notification_commands_attributes => [ :id, :command_name, :command_line, :command_description ], :service_notification_commands_attributes => [ :id, :command_name, :command_line, :command_description ]) As far as I understand, this is all that needs to be done and Rails should handle the rest, right? The problem is that it does not even try to to establish a relationship. It does a SELECT and immediately fails. When I try to create a new record, it fails with: ActiveRecord::RecordNotFound (Couldn't find Command with ID=1 for Contact with ID=): Because it hasn't yet created a user a hasn't established a relationship. When I try to edit and existing contact and establish a relationship with existing command, it fails with (0.1ms) BEGIN Command Load (0.2ms) SELECT `commands`.* FROM `commands` INNER JOIN `commands_contacts` ON `commands`.`id` = `commands_contacts`.`command_id` WHERE `commands_contacts`.`contact_id` = 3 AND `commands_contacts`.`notification_type` = 'host' AND `commands`.`id` = 1 (0.1ms) ROLLBACK Completed 404 Not Found in 6ms ActiveRecord::RecordNotFound (Couldn't find Command with ID=1 for Contact with ID=3): Uhm... Of course this relationship record is not found. I am trying to create it! Why does it run SELECT instead of UPDATE / INSERT ? So, something tells me I have this relationship defined incorrectly somewhere in my models.... but where? How do i troubleshoot this? -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To unsubscribe from this group and stop receiving emails from it, send an email to rubyonrails-talk+unsubscr...@googlegroups.com. To post to this group, send email to rubyonrails-talk@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/rubyonrails-talk/65a363df-4b6a-4957-915a-534e5524a1b9%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.