CODEWITHSUNDEEP
pythondjangodjango-models
Atma
Atma

Reputation: 29767

how to get field type string from db model in django

I am doing the following:

model._meta.get_field('g').get_internal_type

Which returns the following:

<bound method URLField.get_internal_type of <django.db.models.fields.URLField: g>>

I only want the know that this field is "URLField" . How do I extract that from this output?

Note: I am doing this so that I can do validation on the fields. For example if a url , I want to check if it is well formed.

Upvotes: 43

Views: 34816

Answers (3)

Pranav Raut
Pranav Raut

Reputation: 441

You can do this:

from django.db.models.fields import *
....
if model._meta.get_field('g').__class__ is UrlField:
    ....
....

or If you want to use String instead of working only with UrlField

....
if type(model._meta.get_field('g')) is eval('UrlField'):
    ....
....

or

isinstance(model._meta.get_field('g'), UrlField)
# This will return Boolean result

You Can also use equal '==' instead of 'is'

You can Check Offical Documentation for more information about

Upvotes: 14

abarnert
abarnert

Reputation: 365747

If you were doing this:

model._meta.get_field('g').get_internal_type()

You could not possibly get that as a result.

Instead, you are doing this:

model._meta.get_field('g').get_internal_type

Which, as explained here, does not call the method, it just refers to the method as a bound method object. The return value is not part of that bound method object, it's created by the method when the method is called. So, you have to call it. So you need the parentheses.

Upvotes: 59

Atma
Atma

Reputation: 29767

The answer is to call the method instead:

my_type = field.get_internal_type()

Upvotes: 6

Related Questions