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Typerror() in python while passing parameters to the route [duplicate]

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I need to pass parameter to routes using url_for() function and redirect() I think I did the same. But, I get TypeError: book() missing 1 required positional argument: 'book_title' I know that the parameter book_title is not being recieved by the book() function in my code and thats why the error. But, I dont know what's going wrong behind the scenes.
These are my routes

url_for()

redirect()

TypeError: book() missing 1 required positional argument: 'book_title'

book_title

book()

@app.route('/search/<title>/',methods=['GET','POST'])
def btitle(title):
book_title = db.execute("SELECT title,author,isbn from books WHERE (title LIKE :title)",params={"title":title}).fetchall()
if request.method == 'GET':
#book_title = db.execute("SELECT title,author,isbn from books WHERE (title LIKE :title)",params={"title":title}).fetchall()
if book_title:
return render_template("booktitle.html",book_title=book_title)
else:
return render_template("error.html")
else:
#book_title = db.execute("SELECT title,author,isbn from books WHERE (title LIKE :title)",params={"title":title}).fetchall()
if book_title:
return redirect(url_for("book",book_title=book_title))

@app.route('/books',methods=['GET','POST'])
def book(book_title):
if request.method == 'GET':
return render_template("individualbook.html",book_title=book_title)


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1 Answer
1

You problem is that the book route is not getting the argument book_title that it expects.

book

book_title

This is because you are defining it like this:

@app.route('/books',methods=['GET','POST'])
def book(book_title)


In flask, if you want your view functions to take parameters you need to include them in the route. In your example this could look like this:

@app.route('/books/<book_title>',methods=['GET','POST'])
def book(book_title)


If you do not put the <book_title in the route, flask will not be able to provide the book_title parameter to the book function which is what it tells you in the error.

<book_title

book_title

book