Django dynamically add field from dictionary value

Question

I'm trying to refactor some code to be DRY

I have an importer that imports from an API that has keys that are different than the destination.

Working code looks like this:

this_event = AnEvent()
wp_event = Requests.get('someurl').json()
if 'title' in wp_event.keys():
    this_event.name = wp_event['title']
if 'description' in wp_event.keys():
    this_event.description = wp_event['description']
... and so on

What I am trying to do is this:

scrape_fields  = [
    {
        'wp' : 'description',
        'django' : 'description'
    },
    {
        'wp' : 'title',
        'django' : 'name'
    }
    ... etc
]
for field in scrape_fields:
    if field['wp'] in wp_event.keys():
        # I knew this would not work when I wrote it but not sure what to do
        this_event[field['django']] = wp_event[field['wp']]

But Django throws an exception:

'AnEvent' object does not support item assignment

Is anyone able to advise on how to assign to a field dynamically like this?

Are there any duplicated 'wp's or 'django's values? If not we can boost performance of this. — willeM_ Van Onsem
– willeM_ Van Onsem, Commented Jul 1, 2018 at 20:03

Cole · Accepted Answer · 2018-07-01 19:39:17Z

2

To dynamically assign any Python object's member values using str type values to reference the field name you need to use Python's built-in function setattr. Essentially, this line:

this_event[field['django']] = wp_event[field['wp']]

Can be rewritten to this, using setattr:

setattr(this_event, field['django'], wp_event[field['wp']])

Read: Python docs.

answered Jul 1, 2018 at 19:39

Cole

1,76514 silver badges23 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Daniel Roseman · Accepted Answer · 2018-07-01 19:36:51Z

1

You want setattr():

setattr(this_event, field['django'], wp_event[field['wp'])

answered Jul 1, 2018 at 19:36

Daniel Roseman

602k68 gold badges910 silver badges923 bronze badges

Collectives™ on Stack Overflow

Django dynamically add field from dictionary value

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related