Exception: GraphSQL::AliasedAssociationError

Inherits:
StandardError
  • Object
show all
Defined in:
lib/graphsql/aliased_association_error.rb

Overview

Raised by Resolver#nested_associations when a query requests the same underlying AR association under two different GraphQL field names (e.g. owner/employer both mapped to belongs_to :organization), both resolving to a nestable (to:-mapped) target. Both aliases share one association proxy on the record, and ActiveRecord::Associations::Preloader skips an association it's already marked loaded — so only the first alias's column-limited scope actually takes effect, and the second alias's requested fields silently go missing (up to and including a MissingAttributeError). Raising here turns that into a loud, immediate failure instead of a silent one.

Class Method Summary collapse

Class Method Details

.for_duplicate(type:, association:, fields:) ⇒ Object 



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# File 'lib/graphsql/aliased_association_error.rb', line 15

def self.for_duplicate(type:, association:, fields:)
  new("#{type} maps association `#{association}` under multiple requested GraphQL fields " \
      "(#{fields.map(&:inspect).join(', ')}) — GraphQL.resolve can only apply one column-limited " \
      "preload scope per underlying association per query. Request only one of these fields, or " \
      "don't map `#{association}` under more than one GraphQL field name.")
end