2015-10-07 60 views
1

我有一個簡單的應用程序,完整的代碼呈現here。它採用燒瓶管理員Flask-admin:捕捉inline_models的變化

型號:

class User(db.Model): 
    id = db.Column(db.Integer, primary_key=True) 
    username = db.Column(db.String, unique=True) 


class UserNote(db.Model): 
    id = db.Column(db.Integer, primary_key=True) 
    body = db.Column(db.String, nullable=False) 
    user_id = db.Column(db.Integer, db.ForeignKey('users.id')) 
    author_id = db.Column(db.Integer, db.ForeignKey('users.id')) 
    user = db.relationship(User, 
          foreign_keys='UserNote.user_id', 
          backref=db.backref('user_notes', order_by=id)) 
    author = db.relationship(User, 
          foreign_keys='UserNote.author_id', 
          backref=db.backref('author_user_notes', 
               order_by=id)) 

和主要app.py:

app = Flask(__name__) 

class ModelFormWithAuthorship(InlineFormAdmin): 
    def on_model_change(self, form, model): 
     user = User.query.first() 
     print('++++++') 
     print(user) 
     print(model) 
     print('++++++') 
     model.author = user 

class UserModelView(ModelView): 
    inline_models = (ModelFormWithAuthorship(UserNote),) 


admin = Admin(app, url='/admin', name='MyAdmin', template_mode='bootstrap3') 
admin.add_view(UserModelView(User, db.session)) 

我想自動設置從查詢中第一個用戶視爲改變UserNote的作者。這對於當前登錄的用戶來說是簡化的。

但燒瓶管理員將所有內聯模型傳遞給此方法。

這裏是reporduce步驟

  1. 開始應用
  2. 創建名爲user1的用戶(該用戶可能是第())
  3. 創建名爲ADMIN1用戶
  4. 創建名用戶admin2
  5. 創建2個內嵌備註,它將以user1作爲作者
  6. 直接連接到數據庫並更改作者o F中的音符之一ADMIN1和其他照會的admin2
  7. 轉到瓶,管理和確保,你有2注2個用戶
  8. 第一個音符的編輯身上,然後點擊保存

預期結果對於這些動作對我來說,那第一個音符將有user1作爲作者和第二個音符的作者將保持不變。 但實際結果如下:作者爲這兩個筆記設置爲user1。

我試着調試,並發現了一些有趣的屬性:

# Not changed note 
model._sa_instance_state._attached = {bool} True 
model._sa_instance_state.deleted = {bool} False 
model._sa_instance_state.detached = {bool} False 
model._sa_instance_state.expired = {bool} False 
model._sa_instance_state.has_identity = {bool} True 
model._sa_instance_state.pending = {bool} False 
model._sa_instance_state.persistent = {bool} True 
model._sa_instance_state.transient = {bool} False 
model.body = {str} 'test1' 
model._sa_instance_state.modified = {bool} True 

# Changed note 
model._sa_instance_state._attached = {bool} True 
model._sa_instance_state.deleted = {bool} False 
model._sa_instance_state.detached = {bool} False 
model._sa_instance_state.expired = {bool} False 
model._sa_instance_state.has_identity = {bool} True 
model._sa_instance_state.pending = {bool} False 
model._sa_instance_state.persistent = {bool} True 
model._sa_instance_state.transient = {bool} False 
model.body = {str} 'test2A' 
model._sa_instance_state.modified = {bool} True 

但他們無法區分彼此。

是否有辦法只捕捉更改的模型?

回答

2

可以使用WTForms' Field.object_data屬性:

這是從對象或從kwargs到外地, 存儲未修改傳遞的數據。

class ModelFormWithAuthorship(InlineFormAdmin): 
    def on_model_change(self, form, model):  
     # Check whether note's body has changed 
     if form.body.object_data != form.body.data: 
      model.author = User.query.first() 
:這可以通過模板,窗口小部件,如果需要這樣使用,因爲需要驗證器 (相比之下,例如)

所以,你可以比較UserNote.body新舊值,然後更改作者