Django many-to-many query matching all related fields

Question

I have two models connected by a many-to-many relationship in django.

class BuildingMapping(models.Model):

    name = models.CharField(max_length=1000, null=False)
    buildings = models.ManyToManyField(
        Building, related_name="mapping"
    )

class Building(models.Model):
    function = models.CharField(
        max_length=1000, blank=True, null=True
    )

Function is a string containing one or more identifier divieded by a "/" eg "1300", "1300/2200", "1300/2230/7500", ...

I now want to perform a query that gets only BuildingMapping instances where the function for all Buildings is identical. I tried the following, but this will also return BuildingMapping instances where only one Building has "1300" as function.

BuildingMapping.objects.filter(buildings__function="1300")

Thanks!

Answer 1

If I understood correct, you want to get function field contains "1300". If it is right: BuildingMapping.objects.filter(buildings__function__contains="1300")

Answer 2

I see that you are trying to fetch all the results which are matching 1300. What you are doing is exact match

strong text

You need to use icontains(case insensitive) or contains(case sensitive) for getting all matched data