Question

I’d like to query a model for a specific field I’ve got as a string.

Demo:

class Foo(models.Model):
    someones_name = models.CharField(max_length=100)
    anothers_name = models.CharField(max_length=100)

# python shell:
>> Foo.objects.get(pk=1).someones_name
u'Cpt. Hook'
>> Foo.objects.get(pk=1).anothers_name
u'Peter Pan'

Now – I got in a variable the name of the field someones_name

>> field_name = 'someones_name'

So, how do I perform the almost same query against the Foo-Model with that field_name-variable? If indeed such a thing is possible?

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Edit

I’m not looking to query with that field_name. I want the exact value of the field given in field_name. I know that I could do something like this

query = Foo.objects.get(pk=1)
query.someones_name
query.anothers_name

All I need is to get this one specific field I dynamicaly receive from ._meta.fields (from another model) as a string.

In RAW-SQL something like: 'SELECT %s FROM foo where pk = 1' % field_name

Answer 1

field_name = 'someones_name'
Foo.objects.get(**{field_name: 'Cpt. Hook'})

It is equal to:

Foo.objects.get(someones_name='Cpt. Hook')

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UPDATE:

field_name = 'someones_name'
obj = Foo.objects.get(pk=1)
getattr(obj, field_name)

Equal to:

Foo.objects.get(pk=1).someones_name