Adds validation and save callbacks for the association as specified by the reflection.
For performance reasons, we don’t check whether to validate at runtime. However the validation and callback methods are lazy and those methods get created when they are invoked for the very first time. However, this can change, for instance, when using nested attributes, which is called after the association has been defined. Since we don’t want the callbacks to get defined multiple times, there are guards that check if the save or validation methods have already been defined before actually defining them.
# File lib/active_record/autosave_association.rb, line 154 154: def add_autosave_association_callbacks(reflection) 155: save_method = :"autosave_associated_records_for_#{reflection.name}" 156: validation_method = :"validate_associated_records_for_#{reflection.name}" 157: collection = reflection.collection? 158: 159: unless method_defined?(save_method) 160: if collection 161: before_save :before_save_collection_association 162: 163: define_method(save_method) { save_collection_association(reflection) } 164: # Doesn't use after_save as that would save associations added in after_create/after_update twice 165: after_create save_method 166: after_update save_method 167: else 168: if reflection.macro == :has_one 169: define_method(save_method) { save_has_one_association(reflection) } 170: after_save save_method 171: else 172: define_method(save_method) { save_belongs_to_association(reflection) } 173: before_save save_method 174: end 175: end 176: end 177: 178: if reflection.validate? && !method_defined?(validation_method) 179: method = (collection ? :validate_collection_association : :validate_single_association) 180: define_method(validation_method) { send(method, reflection) } 181: validate validation_method 182: end 183: end
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