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Rails: Creating/updating has_many relationships for existing has_many records

Rails has_many with alias nameBug? I've to mass-assign params two times to update has_many associationMongoid - Updating Nested AttributesRails find record with zero has_many records associatedCreating / updating locations while creating a checkin in RailsCan't Mass assign attributes with nested formRails has_many :through with :primary_keyAdding Role dynamically through Form USing Rolify along with Devise and CancanRails 4 accepts_nested_attributes_for for has_many through relationship: :_destroy is not workingRails 4 relationships and Postgres foreign key constraints

0

Given:

class Group < ApplicationRecord
 has_many :customers, inverse_of: :group
 accepts_nested_attributes_for :customers, allow_destroy: true
end

class Customer < ApplicationRecord
 belongs_to :group, inverse_of: :customers
end

I want to create/update a group and assign existing customers to the group e.g.:

Group.new(customers_attributes: [ id: 1 , id: 2 ])

This does not work though because Rails will just throw ActiveRecord::RecordNotFound: Couldn't find Customer with ID=1 for Group with ID= (or ID=the_group_id if I'm updating a Group). Only way I've found to fix it is just extract customers_attributes and then do a separate Customer.where(id: [1,2]).update_all(group_id: 'groups_id') after the Group save! call.

Anyone else come across this? I feel like a way to fix it would be to have a key like _existing: true inside customers_attributes (much like _destroy: true is used to nullify the foreign key) could work. Or does something like this violate a Rails principle that I'm not seeing?

ruby-on-rails ruby has-many

share|improve this question

asked Mar 7 at 12:52

user701847user701847

166113

add a comment | 

0

Given:

class Group < ApplicationRecord
 has_many :customers, inverse_of: :group
 accepts_nested_attributes_for :customers, allow_destroy: true
end

class Customer < ApplicationRecord
 belongs_to :group, inverse_of: :customers
end

I want to create/update a group and assign existing customers to the group e.g.:

Group.new(customers_attributes: [ id: 1 , id: 2 ])

This does not work though because Rails will just throw ActiveRecord::RecordNotFound: Couldn't find Customer with ID=1 for Group with ID= (or ID=the_group_id if I'm updating a Group). Only way I've found to fix it is just extract customers_attributes and then do a separate Customer.where(id: [1,2]).update_all(group_id: 'groups_id') after the Group save! call.

Anyone else come across this? I feel like a way to fix it would be to have a key like _existing: true inside customers_attributes (much like _destroy: true is used to nullify the foreign key) could work. Or does something like this violate a Rails principle that I'm not seeing?

ruby-on-rails ruby has-many

share|improve this question

asked Mar 7 at 12:52

user701847user701847

166113

add a comment | 

Given:

class Group < ApplicationRecord
 has_many :customers, inverse_of: :group
 accepts_nested_attributes_for :customers, allow_destroy: true
end

class Customer < ApplicationRecord
 belongs_to :group, inverse_of: :customers
end

I want to create/update a group and assign existing customers to the group e.g.:

Group.new(customers_attributes: [ id: 1 , id: 2 ])

This does not work though because Rails will just throw ActiveRecord::RecordNotFound: Couldn't find Customer with ID=1 for Group with ID= (or ID=the_group_id if I'm updating a Group). Only way I've found to fix it is just extract customers_attributes and then do a separate Customer.where(id: [1,2]).update_all(group_id: 'groups_id') after the Group save! call.

Anyone else come across this? I feel like a way to fix it would be to have a key like _existing: true inside customers_attributes (much like _destroy: true is used to nullify the foreign key) could work. Or does something like this violate a Rails principle that I'm not seeing?

ruby-on-rails ruby has-many

share|improve this question

asked Mar 7 at 12:52

user701847user701847

166113

class Group < ApplicationRecord
 has_many :customers, inverse_of: :group
 accepts_nested_attributes_for :customers, allow_destroy: true
end

class Customer < ApplicationRecord
 belongs_to :group, inverse_of: :customers
end

Group.new(customers_attributes: [ id: 1 , id: 2 ])

share|improve this question

asked Mar 7 at 12:52

user701847user701847

166113

share|improve this question

asked Mar 7 at 12:52

user701847user701847

166113

asked Mar 7 at 12:52

user701847user701847

166113

asked Mar 7 at 12:52

user701847user701847

166113

1 Answer
1

active

oldest

votes

1

Actually, you don't need to use nested attributes for this, you can instead set the association_ids attribute directly:

Group.new(customer_ids: [1, 2])

This will automatically update the group_id on each referenced Customer when the record is saved.

share|improve this answer

answered Mar 7 at 13:17

James PageJames Page

111

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Ah, I forgot to mention that. So while that's fine for creating a new group, if you do that when updating a group, it erases any previous customers that may have been attached to that Group. I'm kind of looking for an all-in-one solution.
  
  – user701847
  Mar 7 at 13:20
  
  

  
  
  
  

add a comment | 

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1

Actually, you don't need to use nested attributes for this, you can instead set the association_ids attribute directly:

Group.new(customer_ids: [1, 2])

This will automatically update the group_id on each referenced Customer when the record is saved.

share|improve this answer

answered Mar 7 at 13:17

James PageJames Page

111

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Ah, I forgot to mention that. So while that's fine for creating a new group, if you do that when updating a group, it erases any previous customers that may have been attached to that Group. I'm kind of looking for an all-in-one solution.
  
  – user701847
  Mar 7 at 13:20
  
  

  
  
  
  

add a comment | 

1

Actually, you don't need to use nested attributes for this, you can instead set the association_ids attribute directly:

Group.new(customer_ids: [1, 2])

This will automatically update the group_id on each referenced Customer when the record is saved.

share|improve this answer

answered Mar 7 at 13:17

James PageJames Page

111

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Ah, I forgot to mention that. So while that's fine for creating a new group, if you do that when updating a group, it erases any previous customers that may have been attached to that Group. I'm kind of looking for an all-in-one solution.
  
  – user701847
  Mar 7 at 13:20
  
  

  
  
  
  

add a comment | 

Actually, you don't need to use nested attributes for this, you can instead set the association_ids attribute directly:

Group.new(customer_ids: [1, 2])

This will automatically update the group_id on each referenced Customer when the record is saved.

share|improve this answer

answered Mar 7 at 13:17

James PageJames Page

111

Group.new(customer_ids: [1, 2])

share|improve this answer

answered Mar 7 at 13:17

James PageJames Page

111

answered Mar 7 at 13:17

James PageJames Page

111

answered Mar 7 at 13:17

James PageJames Page

111