will save form

Author: tib

Sources/ViewKit/Form/Forms/ModelForm.swift

@@ -14,6 +14,7 @@ public protocol ModelForm: Form {
     func read(from: Model)
     func write(to: Model)
 
+    func willSave(req: Request, model: Model) -> EventLoopFuture<Void>
     func didSave(req: Request, model: Model) -> EventLoopFuture<Void>
 }
 
@@ -28,6 +29,10 @@ public extension ModelForm {
         ])
     }
 
+    func willSave(req: Request, model: Model) -> EventLoopFuture<Void> {
+        req.eventLoop.future()
+    }
+
     func didSave(req: Request, model: Model) -> EventLoopFuture<Void> {
         req.eventLoop.future()
     }

Sources/ViewKit/ViewController/Create/CreateViewController+Public.swift

@@ -90,7 +90,8 @@ public extension CreateViewController {
                     let model = Model()
                     form.write(to: model as! CreateForm.Model)
 
-                    return beforeCreate(req: req, model: model, form: form)
+                    return form.willSave(req: req, model: model as! CreateForm.Model)
+                        .flatMap { beforeCreate(req: req, model: model, form: form) }
                         .flatMap { model in model.create(on: req.db).map { model } }
                         .flatMap { model in form.didSave(req: req, model: model as! CreateForm.Model ).map { model } }
                         .flatMap { afterCreate(req: req, form: form, model: $0) }

Sources/ViewKit/ViewController/Update/UpdateViewController+Public.swift

@@ -95,6 +95,7 @@ public extension UpdateViewController {
                     }
                     return findBy(id, on: req.db)
                         .map { form.write(to: $0 as! UpdateForm.Model); return $0; }
+                        .flatMap { model in form.willSave(req: req, model: model as! UpdateForm.Model).map { model } }
                         .flatMap { beforeUpdate(req: req, model: $0, form: form) }
                         .flatMap { model in model.update(on: req.db).map { model } }
                         .flatMap { model in form.didSave(req: req, model: model as! UpdateForm.Model).map { model } }