Method: ActiveScaffold::DataStructures::NestedInfoAssociation#readonly_through_association?

Defined in:
lib/active_scaffold/data_structures/nested_info.rb

#readonly_through_association?(columns) ⇒ Boolean

A through association with has_one or has_many as source association create cannot be called in nested through associations, and not-nested through associations, unless:

  1. is through singular and source association has reverse, e.g.: Employee belongs to vendor, Vendor has many rates, Rate belongs to vendor, Employee has many rates through vendor Rates association through singular association vendor, source association in Vendor (rates) has reverse (vendor in Rate) AS will assign the vendor of the employee to the new Rate

  2. source association is singular, e.g.: Customer has many networks, Network has one (or belongs to) firewall, Customer has many firewalls through networks

  3. create columns include through association of reverse association, e.g.: Vendor has many employees, Employee has many rates, Vendor has many rates through employees, Rate has one vendor through employee RatesController has employee in create action columns (reverse is vendor, and through association employee is in create form).

Returns:

  • (Boolean) 


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# File 'lib/active_scaffold/data_structures/nested_info.rb', line 103

def readonly_through_association?(columns)
  return false unless through_association?
  return true if association.through_reflection.options[:through] # create not possible, too many levels
  return true if association.source_reflection.options[:through] # create not possible, too many levels
  return false if create_through_singular? # create allowed, AS has code for this
  return false unless association.source_reflection.collection? # create allowed if source is singular, rails creates joint model

  # create allowed only if through reflection in record to be created is included in create columns
  !child_association || columns.exclude?(child_association.through_reflection.name)
end