Flask蓝图究竟是什么？ [英] What are Flask Blueprints, exactly?

问题描述

阅读官方Flask文档关于蓝图，甚至一个或

我甚至在我的网站中使用过这些内容应用程序，但我不完全明白他们是什么或如何适合我的应用程序作为一个整体。它与我的应用程序的实例有什么相似之处，但不完全相同？文件是全面的，但我寻求一个外行的解释或启发类比来激发我。当一位同事要求我向他们解释一个我选择在这里问的瓶子蓝图的时候，我感到非常困惑。

解决方案

蓝图是用于生成Web应用程序的部分的模板。把它想象成一个模子：

你可以把蓝图应用到你的应用程序的几个地方。你每次申请蓝图，都会在你的应用程序中创建一个新的结构。

 ＃例子
 from flask import蓝图
 
 tree_mold =蓝图（mold，__name__）
 
 @ tree_mold.route（/ leaves）
 def leaves ）：
 return这棵树有叶子
 
 @ tree_mold.route（/ roots）
 def roots（）：
 return 
 
 @ tree_mold.route（/ rings）
 @ tree_mold.route（/ rings /< int：year>）
 def rings（year = None ）：
 returnLooking the rings for {year}。format（year = year）
  

这是一个简单的树木工作模式 - 它说任何处理树木的应用程序都应该提供访问它的树叶，树根和环（每年）。它本身就是一个空心的壳 - 它无法路由，它不能作出反应，直到它给一个应用程序留下印象：

  from tree_workshop import tree_mold 
 $ b $ app.register_blueprint（tree_mold，url_prefix =/ oak）
 app.register_blueprint（tree_mold，url_prefix =/ fir）
 app.register_blueprint（tree_mold ，url_prefix =/ ash）
  

创建完成后，使用 register_blueprint 函数 - 这个印象在 url_prefix 指定的位置上的应用程序的蓝图模具。

I have read the official Flask documentation on Blueprints and even one or two blog posts on using them.

I've even used them in my web app, but I don't completely understand what they are or how they fit into my app as a whole. How is it similar to an instance of my app but not quite? The documentation is comprehensive but I seek a layman explanation or an enlightening analogy to spark it for me. I was sufficiently perplexed when a colleague asked me to explain a Flask blueprint to them that I elected to ask here.

解决方案

A blueprint is a template for generating a "section" of a web application. Think of it like a mold:

You can take the blueprint and apply it to your application in several places. Each time you apply it the blueprint will create a new version of its structure in the plaster of your application.

# An example
from flask import Blueprint

tree_mold = Blueprint("mold", __name__)

@tree_mold.route("/leaves")
def leaves():
    return "This tree has leaves"

@tree_mold.route("/roots")
def roots():
    return "And roots as well"

@tree_mold.route("/rings")
@tree_mold.route("/rings/<int:year>")
def rings(year=None):
    return "Looking at the rings for {year}".format(year=year)

This is a simple mold for working with trees - it says than any application that deals with trees should provide access to its leaves, its roots, and its rings (by year). By itself, it is a hollow shell - it cannot route, it cannot respond, until it is impressed upon an application:

from tree_workshop import tree_mold

app.register_blueprint(tree_mold, url_prefix="/oak")
app.register_blueprint(tree_mold, url_prefix="/fir")
app.register_blueprint(tree_mold, url_prefix="/ash")

Once it is created it may "impressed" on the application by using the register_blueprint function - this "impresses" the mold of the blueprint on the application at the locations specified by url_prefix.

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