Flask Python, trying to return list or dict to Ajax call


Question

Within a Flask app, I have the following ajax call:

    $.ajax({
            url: "{{ url_for( 'bookings.get_customer' ) }}",
            type: "POST",
            data: nameArray,
            success: function( resp ){
                console.log( resp )
            }
        })

As you can see, I am passing an array against which I will search my mongo database, which will either return or not return a customer.

So, the python def that is responsible for handling this ajax call is:

@bookings.route( '/get_customer', methods=[ 'POST' ] )
def get_customer():
    name = {}
    for key, value in request.form.items():
     name[ key ] = value

    customer_obj = customer_class.Customer()
    results = customer_obj.search_customer( name )

    return results    

For argument's sake, lets say the customer_obj call returns the following list:

[{'customer': {
               u'first_name': u'Dave', 
               u'tel': u'0121212121458', 
               u'country': u'UK',     
               u'address2': u'Townington', 
               u'address3': u'Cityville', 
               u'email': u'dave@smith.com', 
               u'postcode': u'A10 5BC', 
               u'address1': u'10 High Street', 
               u'second_name': u'Smith'
             }, 
 'customer_id': u'DaveSmithA10 5BCCat_Vegas1346244086'
}]

When I try to return this to the ajax call as

return results

I get the following error:

 TypeError: 'list' object is not callable

Here is the traceback:

Traceback (most recent call last):
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1701, in __call__
return self.wsgi_app(environ, start_response)
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1689, in wsgi_app
response = self.make_response(self.handle_exception(e))
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1687, in wsgi_app
response = self.full_dispatch_request()
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1361, in
full_dispatch_request
response = self.make_response(rv)
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1450, in make_response
rv = self.response_class.force_type(rv, request.environ)
File "/usr/local/lib/python2.7/dist-packages/werkzeug/wrappers.py", line 711, in
force_type
response = BaseResponse(*_run_wsgi_app(response, environ))
File "/usr/local/lib/python2.7/dist-packages/werkzeug/test.py", line 818, in
run_wsgi_app
app_iter = app(environ, start_response)
TypeError: 'list' object is not callable

Does anyone have any suggestions?

Thanks

1
21
8/30/2012 8:47:33 AM

Accepted Answer

Flask doesn't expect that you will return list object from your view function. Try jsonify it before:

from flask import jsonify

@bookings.route( '/get_customer', methods=[ 'POST' ] )
def get_customer():
    name = {}
    for key, value in request.form.items():
        name[ key ] = value

    customer_obj = customer_class.Customer()
    results = customer_obj.search_customer( name )

    return jsonify(customers=results)    
44
8/30/2012 8:53:09 AM

josonify works..but if you intend to just pass an array without the 'results' key, you can use json library from python. The following conversion works for me..

 import json

 @app.route('/test/json')
 def test_json():
 list = [
        {'a': 1, 'b': 2},
        {'a': 5, 'b': 10}
       ]
 return json.dumps(list)

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