CODEWITHSUNDEEP
pythonflask
sython
sython

Reputation: 29

What is being inherited by class flask.views.MethodView?

Why are we passing flask.views.MethodView in the class?

app.add_url_rule > in this snippet, add_url_rule is this something predefined property?

Similarly view_func, View.as_view > are they predefined?

import flask, flask.views
app = flask.Flask(__name__)

class View(flask.views.MethodView):
    def get(self):
        return "Hello World!"

app.add_url_rule('/',view_func=View.as_view('main'))

app.debug = True
app.run()

Upvotes: 0

Views: 3108

Answers (1)

Martijn Pieters
Martijn Pieters

Reputation: 1121654

View is a subclass of the flask.views.MethodView class. The latter provides base functionality, like the as_view() method:

Converts the class into an actual view function that can be used with the routing system. Internally this generates a function on the fly which will instantiate the View on each request and call the dispatch_request() method on it.

Also see Pluggable Views.

Because this is not a function-based view, you cannot use the @app.route() decorator on it. You use the alternative app.add_url_rule() method instead in that case:

Connects a URL rule. Works exactly like the route() decorator. If a view_func is provided it will be registered with the endpoint.

view_func is a documented keyword argument for this method; when the registered path is requested (in your example /), then whatever as_view() returned is called by Flask. That in turn calls dispatch_request(), which then calls the View().get() method if the HTTP request used a GET method.

Upvotes: 4

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