How to display a dialog with warning message from controller in Odoo? - odoo

Question

Is it possible to display a warning message when overriding a controller function? This is the code I have:
raise Warning(_('Entered Quantity is greater than quantity on source.'))
return super(CheckCart, self).cart(**post)
I want to render the cart template but also raise a Warning, but I get the following:
500: Internal Server Error
Error Error message: ('Entered Quantity is greater than quantity on
source.', '')
Traceback
Without anything else.

Answer 1

Controller File.
request.render("custom_module_name.redirect_fail_page", {})
XML File.
<template id="redirect_fail_page" name="Failure Code Page">
<div>
<span>Failed</span>
</div>
<script>
setTimeout(function(){
window.location.href = '/';
}, 1100)
</script>
</template>
Here you can use request.render

Answer 2

You can do it like this way,
Called the Json Controller was based on logic return the value and on the js check with the value is satisfied then with Dialog you can raise the warning.
On Py File,
#http.route(['/custom/url'], type='json', auth="public", website=True)
def checkout_custom(self, **post):
# Logic Based on the that return True/False.
On JS File,
var ajax = require('web.ajax');
var Dialog = require('web.Dialog');
ajax.jsonRpc("/custom/url", 'call', {}).then(function(data) {
if (data) {
var dialog = new Dialog(this, {
size: 'medium',
$content: _t("<div style='font-size:14px;font-family:Helvetica, Arial, sans-serif;'>Warning Message.</div>"),
buttons: [{
text: _t('Ok'),
classes: "btn-primary",
close: true
}],
}).open();
} else {
// Process
}});
Thanks