CODEWITHSUNDEEP
ruby-on-railsrails-activerecord
Tonči D.
Tonči D.

Reputation: 464

Saving two mutually referenced records in Rails 4.1?

Up until Rails 4.1 it was possible to start a transaction, create two records and reference them before committing changes into the DB.

Records are in the many-to-many relationship with existence constraint on both ends, i.e. there cannot be an empty group nor can a person not belong to at least one group.

Class outlines:

class Person
  has_and_belongs_to_many :groups
  validates_presence_of :groups
end

class Group
  has_and_belongs_to_many :persons
  validates_presence_of :persons
end

Transaction code example:

Person.transaction do
  person = Person.new(...)
  group = Group.create!(..., persons: [person])
  person.groups << group
  person.save!
end

Is there a way to defer the existence check till the commit phase? Any better suggestion?

Upvotes: 0

Views: 51

Answers (1)

Marek Takac
Marek Takac

Reputation: 3048

Just use inverse_of. That should solve your problem:

class Person
  has_and_belongs_to_many :groups, inverse_of: :groups
  ...
end

class Group
  has_and_belongs_to_many :persons, inverse_of: :persons
  ..
end

Upvotes: 1

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