+ (lol::present
+ (lol:make-presentation (meta-model:explode-foreign-key instance (slot-name slot))
+ :type :one-line
+ :initargs
+ `(:attributes ,(attributes slot)))
+ ))
+ (<:as-html "--"))))
+
+(defslot-presentation many-to-many-slot-presentation (mewa-relation-slot-presentation)
+ ((list-view :accessor list-view :initarg :list-view :initform :one-line)
+ (action-view :accessor action-view :initarg :action-view :initform :viewer)
+ (create-view :initform :creator)
+ (select-view :initform :as-string :accessor select-view))
+ (:type-name many-to-many)
+ (:default-initargs :label "many to many"))
+
+(defun %delete-item (item)
+ (clsql:with-default-database (clsql:*default-database*)
+ (ignore-errors
+ (clsql:delete-instance-records item))))
+
+(defaction delete-item ((self component) instance)
+ (multiple-value-bind (res err) (%delete-item instance)
+ (if (not err)
+ (call 'info-message :message "Removed Instance")
+ (call 'info-message :message (format nil "Could not remove item. Try removing associated items first. ~A" instance)))))
+
+(defaction delete-relationship ((slot many-to-many-slot-presentation) rel instance)
+ (delete-item (ucw::parent self) rel)
+ (sync-instance instance)
+ (answer-component (ucw::parent self) t))
+
+
+(defun find-many-to-many-join-class (slot instance)
+ (let* ((imd (getf (meta-model::find-slot-metadata instance (slot-name slot))
+ :db-info))
+ (jc (make-instance (getf imd :join-class)))
+ (jcmd (getf (meta-model::find-slot-metadata jc (getf imd :target-slot))
+ :db-info)))
+ (getf jcmd :join-class)))
+
+(defmethod find-all-instances ((slot many-to-many-slot-presentation) instance)
+ (clsql:select (find-many-to-many-join-class slot instance) :flatp t))
+
+(defmethod present-slot ((slot many-to-many-slot-presentation) instance)
+ (let ((instances (slot-value instance (slot-name slot)))
+ new-instance)
+ (<:ul
+ (<:li (<ucw:button :action (add-to-many-to-many slot instance)
+ (<:as-html "Add New")))
+ (<:li (<ucw:button :action (add-to-many-to-many slot instance new-instance)
+ (<:as-html "Add:"))
+ (<ucw:select :accessor new-instance
+ (arnesi:dolist* (i (find-all-instances slot instance))
+ (<ucw:option
+ :value i
+ (lol:present-view (i (select-view slot) slot))))))
+ (dolist* (i instances)
+ (<:li
+ (<ucw:a :action (call-view ((car i) (action-view slot) (ucw::parent slot)))
+ (<:as-html "(view) "))
+ (<ucw:a :action (delete-relationship slot (second i) instance)
+ (<:as-html "(remove) "))
+ (present-view ((car i) (list-view slot) (ucw::parent slot)))) ))))
+
+
+(defaction add-to-many-to-many ((slot many-to-many-slot-presentation) instance &optional foreign-instance)
+ ;;;; First things first, we sync.
+ (sync-instance instance)
+ (let* (new
+ (imd (getf (meta-model::find-slot-metadata instance (slot-name slot))
+ :db-info))
+ (jc (make-instance (getf imd :join-class)))
+ (jcmd (getf (meta-model::find-slot-metadata jc (getf imd :target-slot))
+ :db-info))
+ (fc (make-instance (getf jcmd :join-class)))
+ (c (if
+ foreign-instance
+ foreign-instance
+ (call-view (fc :creator (ucw::parent slot))))))
+ (when c
+ (sync-instance c)
+; (error "~A ~A ~A" (getf imd :foreign-key) (getf jcmd :foreign-key) (getf imd :home-key))
+ (setf (slot-value jc (getf imd :foreign-key))
+ (slot-value instance (getf imd :home-key)))
+ (setf (slot-value jc (getf jcmd :home-key))
+ (slot-value c (getf jcmd :foreign-key)))
+ (sync-instance jc)
+
+ (sync-instance instance)
+ c)))