module RelationToStruct::ActiveRecordRelationExtension
Public Instance Methods
to_structs(struct_class)
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# File lib/relation_to_struct/active_record_relation_extension.rb, line 2 def to_structs(struct_class) raise ArgumentError, 'Expected select_values to be present' unless self.select_values.present? relation = spawn # See the definition of #pluck in: # activerecord/lib/active_record/relation/calculations.rb result = nil if ActiveRecord::VERSION::MAJOR == 5 && ActiveRecord::VERSION::MINOR < 2 result = klass.connection.select_all(relation.arel, nil, bound_attributes) else result = klass.connection.select_all(relation.arel) end if result.columns.size != struct_class.members.size raise ArgumentError, 'Expected struct fields and columns lengths to be equal' end if result.columns.size != result.columns.uniq.size raise ArgumentError, 'Expected column names to be unique' end values_after_casting = result.cast_values() if result.columns.size == 1 values_after_casting.map do |tuple| struct_class.new(tuple) end else values_after_casting.map do |tuple| struct_class.new(*tuple) end end end