-(defmethod install-instance ((obj standard-db-object)
- &key (database *default-database*))
- (labels ((slot-storedp (slot)
- (and (member (view-class-slot-db-kind slot) '(:base :key))
- (slot-boundp obj (slot-definition-name slot))))
- (slot-value-list (slot)
- (let ((value (slot-value obj (slot-definition-name slot))))
- (check-slot-type slot value)
- (list (sql-expression :attribute (view-class-slot-column slot))
- (db-value-from-slot slot value database)))))
- (let* ((view-class (class-of obj))
- (view-class-table (view-table view-class))
- (slots (remove-if-not #'slot-storedp (ordered-class-slots view-class)))
- (record-values (mapcar #'slot-value-list slots)))
- (unless record-values
- (error "No settable slots."))
- (unless
- (let ((obj-db (slot-value obj 'view-database)))
- (when obj-db
- (equal obj-db database))))
- (insert-records :into (sql-expression :table view-class-table)
- :av-pairs record-values
- :database database)
- (setf (slot-value obj 'view-database) database))
- (values)))
-
-;; Perhaps the slot class is not correct in all CLOS implementations,
-;; tho I have not run across a problem yet.
-
-(defmethod handle-cascade-delete-rule ((instance standard-db-object)
- (slot
- view-class-effective-slot-definition))
- (let ((val (slot-value instance (slot-definition-name slot))))
- (typecase val
- (list
- (if (gethash :target-slot (view-class-slot-db-info slot))
- ;; For relations with target-slot, we delete just the join instance
- (mapcar #'(lambda (obj)
- (delete-instance-records obj))
- (fault-join-slot-raw (class-of instance) instance slot))
- (dolist (obj val)
- (delete-instance-records obj))))
- (standard-db-object
- (delete-instance-records val)))))
-
-(defmethod nullify-join-foreign-keys ((instance standard-db-object) slot)
- (let* ((dbi (view-class-slot-db-info slot))
- (fkeys (gethash :foreign-keys dbi)))
- (mapcar #'(lambda (fk)
- (if (view-class-slot-nulls-ok slot)
- (setf (slot-value instance fk) nil)
- (warn "Nullify delete rule cannot set slot not allowing nulls to nil")))
- (if (listp fkeys) fkeys (list fkeys)))))
-
-(defmethod handle-nullify-delete-rule ((instance standard-db-object)
- (slot
- view-class-effective-slot-definition))
- (let ((dbi (view-class-slot-db-info slot)))
- (if (gethash :set dbi)
- (if (gethash :target-slot (view-class-slot-db-info slot))
- ;;For relations with target-slot, we delete just the join instance
- (mapcar #'(lambda (obj)
- (nullify-join-foreign-keys obj slot))
- (fault-join-slot-raw (class-of instance) instance slot))
- (dolist (obj (slot-value instance (slot-definition-name slot)))
- (nullify-join-foreign-keys obj slot)))
- (nullify-join-foreign-keys
- (slot-value instance (slot-definition-name slot)) slot))))
-
-(defmethod propogate-deletes ((instance standard-db-object))
- (let* ((view-class (class-of instance))
- (joins (remove-if #'(lambda (sd)
- (not (equal (view-class-slot-db-kind sd) :join)))
- (ordered-class-slots view-class))))
- (dolist (slot joins)
- (let ((delete-rule (gethash :delete-rule (view-class-slot-db-info slot))))
- (cond
- ((eql delete-rule :cascade)
- (handle-cascade-delete-rule instance slot))
- ((eql delete-rule :deny)
- (when (slot-value instance (slot-definition-name slot))
- (error
- "Unable to delete slot ~A, because it has a deny delete rule."
- slot)))
- ((eql delete-rule :nullify)
- (handle-nullify-delete-rule instance slot))
- (t t))))))
-