Flask beginner here, bear with me please !
In this little piece of code I simplified for the question, I have for a defined route / with 2 forms : I'd like the add form to add things to the db and the delete form to delete things, simple.
However my issue is that in this code I can't differentiate which input button from the form is pressed as formadd.validate() and formdel.validate() both always return true.
How can I differentiate which submit button is pressed in order to manipulate the database accordingly ?
At first I wrote what is currently commented below, but obviously it doesn't work since the validate method returns true....
from flask import Flask, render_template, request
from flask.ext.sqlalchemy import SQLAlchemy
from wtforms import Form, StringField
app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///botdb.db'
db = SQLAlchemy(app)
class BotFormAdd(Form):
botname = StringField('bot name')
botdescription = StringField('bot description')
class BotFormDelete(Form):
botid = StringField('bot id')
@app.route('/', methods=['GET', 'POST'])
def index():
formadd = BotFormAdd(request.form)
formdel = BotFormDelete(request.form)
if request.method == 'POST':
print(formadd.validate(), formdel.validate())
# if request.method == 'POST' and formadd.validate():
# print('in formadd')
# bot = Bot(name=formadd.botname.data, description=formadd.botdescription.data)
# db.session.add(bot)
# db.session.commit()
# return redirect(url_for('index'))
# if request.method == 'POST' and formdel.validate():
# print('in formdel')
# db.session.delete(formdel.botid.data)
# db.session.commit()
# return redirect(url_for('index'))
return render_template('index.html', title='Home', formadd=formadd, formdel=formdel)
if __name__ == '__main__':
app.run(debug=True)
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>this is a test</title>
</head>
<body>
<form method=post action="/">
<dl>
{{ formadd.botname }}
{{ formadd.botdescription }}
</dl>
<p><input type=submit name='add' value='add this'>
</form>
<form method=post action="/">
<dl>
{{ formdel.botid }}
</dl>
<p><input type=submit name='delete' value='delete this'>
</form>
</body>
</html>
There's lots of ways of doing this, but it breaks down into two categories-- either you indicate it via the route, or via an element on a form.
Most people would just add separate routes:
@app.route('/delete-bot/', methods=['post'])
def delete_bot():
form = BotFormDelete()
if form.validate():
delete_bot(id=form.botid.data)
flash('Bot is GONE')
return redirect(url_for('index'))
So your delete form would submit to that route, get processed and sent back to index.
<form method='post' action='url_for('delete_bot')>
And you'd have a different route for adding a bot.
Alternatively you could check what type of form it was from it's contents. E.g.
if request.form.get('botid'):
# it has a botid field, it must be a deletion request
form = BotFormDelete()
form.validate()
delete_bot(form.botid.data)
else:
form = BotFormAdd()
....
But that way seems like it would get messy quickly.
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