#flask #python
Flask-Migrate: 下 flask db downgrade 指令，遇到錯誤訊息：
drop_constraint etc. should check for name=None and ...
Flask-Migrate: 下 flask db downgrade 指令，遇到錯誤訊息：
if len(ident) > self.max_identifier_length:
TypeError: object of type 'NoneType' has no len()drop_constraint etc. should check for name=None and ...
有設外鍵，新增 record 時卻跟我說沒有設外鍵，不知道是我哪裡弄錯還是發生什麼事。總之先用底下 primaryjoin 的方式頂著
How do I do a join without a real foreign key constr...
How do I do a join without a real foreign key constr... 
GitHub - GoogleChromeLabs/samesite-examples: Example...
Flask SQLAlchemy query, specify column names用with_entities查訊，印出來的東西乍看之下是 tuple，例如：from models import Product
products = Product.query.with_entities(http://Product.name/..., Product.price, Product.image_url).all()
print(products)印出：[('商品 1', 27361, '
但是可以用 key(?) 的方式取值：
print(products[0].price)印出：27361
Flask SQLAlchemy query, specify column names用with_entities查訊，印出來的東西乍看之下是 tuple，例如：from models import Product
products = Product.query.with_entities(Product.name, Product.price, Product.image_url).all()
print(products)印出：[('商品 1', 27361, 'some_url')]
但是可以用 key(?) 的方式取值：
print(products[0].price)印出：27361
print(type(products[0]))印出：<class 'sqlalchemy.engine.row.Row'>
Flask-RESTful render_template cannot work【Flask-RESTful does not use render_template. It is designed to work with REST API calls and render JSON responses. Unless you are building a REST API, you don't need Flask-RESTful, just Flask.】
SQLAlchemy - filter vs filter_by
SQLAlchemy 的 relationship 可以排序
Configuring Relationships — SQLAlchemy 1.3 Documenta...
Configuring Relationships — SQLAlchemy 1.3 Documenta...
Python Web Flask — 用WTF Form製作表單. 先前我們曾經提到過使用request...
第 25 天：Flask：登入系統 Flask-Login - iT 邦幫忙::一起幫忙解決難題，拯救 ...
How To Add Authentication to Your App with Flask-Log...原來有內建的 generate_password_hash
設定 select 元素預設被 selected 的選項
How do you set a default value for a WTForms SelectF...关于python 3.x：为jinja中的flask wtforms selectfield选择默认值以...
How do you set a default value for a WTForms SelectF...关于python 3.x：为jinja中的flask wtforms selectfield选择默认值以...
不知道哪來的錯誤訊息，繼續觀察
sqlalchemy.exc.TimeoutError: QueuePool limit of size 10 overflow 10 reached
sqlalchemy.exc.TimeoutError: QueuePool limit of size 10 overflow 10 reached
修改 session，但修改的結果沒有存起來
Flask session variable not persisting between reques...【Flask uses a CallbackDict to track modifications to sessions.
It will only register modifications when you set or delete a key. Here, you modify the values in place, which it will not detect.
】
Flask session variable not persisting between reques...【Flask uses a CallbackDict to track modifications to sessions.It will only register modifications when you set or delete a key. Here, you modify the values in place, which it will not detect.
session.modified = True】
Sending Emails with Flask - Step-by-Step Flask-Mail ...
Demystifying Flask’s Application Factory
sqlalchemy 如何现实动态查询条件以及动态字段查询
Application Server、WSGI Server、Web Server 之間的關係
Flask想上線? 你還需要一些酷東西
Flask想上線? 你還需要一些酷東西 Flask-上傳檔案和訪問上傳的檔案 - IT閱讀
在路由裡用 return send_from_directory(UPLOAD_PATH,filename)，就可以隱藏檔案的真實位置
在路由裡用 return send_from_directory(UPLOAD_PATH,filename)，就可以隱藏檔案的真實位置
那 Django 到底是怎麼用你的程式？這就要從 WSGI 開始說起
Django Tutorial for Programmers: 2. 談 Django - iT 邦幫...
Django Tutorial for Programmers: 2. 談 Django - iT 邦幫...