class MyModel(models.Model):
data = models.JSONField()
And a custom lookup:
FooField(StrField):
name = "foo"
suggest_options = True
def get_options(self, search):
name = self.get_lookup_name()
lookup = {}
if search:
lookup[f"{name}__icontains"] = search
return self.model.objects.filter(**lookup).order_by(name).values_list(name, flat=True).distinct()
def get_lookup_name(self):
return "data__foo"
class MyModelQLSchema(DjangoQLSchema):
def get_fields(self, model):
fields = super().get_field(model)
if model == MyModel:
fields += [FooField(model=MyModel)]
return fields
On Sqlite, I am able now to search for something like:
foo = "asdf"
But, on Postgres, I get an error:
Traceback (most recent call last):
File "...", line 89, in _execute
return self.cursor.execute(sql, params)
psycopg2.errors.UndefinedFunction: operator does not exist: json = unknown
LINE 1: ...("myapp_mymodel"."data" -> 'foo') = '"asdf"' ...
I am able to run the query:
select * from myapp_mymodel where (data->>'foo')::text = 'asdf'
This query also works (closer to the query that django is using):
select * from myapp_mymodel where (data->'foo')::text = '"asdf"'
The question is how do I implement a custom lookup that will make these casts? It appears that get_lookup wants Q objects. Is there a way I can work with annotations? Or directly manipulate the queryset?
Given a JSONField in the model.
And a custom lookup:
On Sqlite, I am able now to search for something like:
foo = "asdf"But, on Postgres, I get an error:
I am able to run the query:
This query also works (closer to the query that django is using):
The question is how do I implement a custom lookup that will make these casts? It appears that
get_lookupwants Q objects. Is there a way I can work with annotations? Or directly manipulate the queryset?