(Python) Flask - request.args.get returning NoneType

Question

All I need to complete this website is for it to grab the n and s values from the input. But when executing request.get.args is returning None everytime Here's the code:

my_website.py:

import sqlite3
from flask import Flask,render_template, url_for, redirect, request


app = Flask(__name__)
conn = sqlite3.connect('shoes.db', check_same_thread=False)
c = conn.cursor()

@app.route("/", methods=["GET", "POST"])
def main():

    if request.method == 'GET':
        return render_template('main.html')

    elif request.method == 'POST':
        return redirect(url_for('search'))


@app.route("/search/", methods=["GET", "POST"])
def search():

    if not request.args.get("n"):           
        raise RuntimeError("missing n")

    if not request.args.get("s"):
        raise RuntimeError("missing s")

    name = request.args.get('n')
    size = request.args.get('s')
    c.execute("SELECT * FROM shoes WHERE name LIKE ? AND sizes LIKE ? ORDER BY price",
                    ('%'+name+'%','%'+size+'%'))

    p = c.fetchall()

    url = [p[i][0] for i in range(len(p))]
    names = [p[i][1] for i in range(len(p))]
    prices = [p[i][2] for i in range(len(p))]
    sizes = [p[i][3] for i in range(len(p))]
    shoe_type = [p[i][4] for i in range(len(p))]

    return render_template('search.html' , url=url, names=names, prices=prices,
                           sizes=sizes, shoe_type=shoe_type)


if __name__ == '__main__':
    app.run(debug=True)

main.html:

{% extends "layout.html" %}
{% block content %}

<form action = "{{ url_for('main') }}" class="form" method = "POST" >
    <div>
        <h1>Soccer Shoes Finder</h1>
        <div class="line-separator"></div>
        <div>
            <div class="container-fluid">
                <input name = "n" type="text" placeholder="Name"/>
                <input name = "s" type="text" placeholder="Size"/>
                <button class="glyphicon glyphicon-search" aria-hidden="true"></button>
            </div>
        </div>
</form>

{% endblock %}

This is the error that I'm getting:

RuntimeError: missing n

Any advice would be appreciated. Thanks.

Answer 1

request.args holds the values in the query string. Your form on the other hand is sending values in the POST body.

Use the request.form mapping instead, or use request.values, which combines request.form and request.args.

Alternatively, change your form method to GET to have the browser put the arguments in the query string instead.