class projectsmodel(models.Model):
    added_by = 
models.ForeignKey(settings.AUTH_USER_MODEL,null=True,blank=True,on_delete=models.SET_NULL)
    projects=models.CharField(max_length=300)

    def save_model(self,request,obj,form,change):
        obj.added_by=request.User
        super().save_model(request,obj,form,change)
    def __str__(self):
        return self.projects

My BOQ Model,it is the model that needs to be filtered based on project it 
is redirected from

class boqmodel(models.Model):
    project_name = models.ForeignKey(projectsmodel, null=True, blank=True, 
on_delete=models.SET_NULL)
    code = models.IntegerField()
    building = models.ForeignKey(building, on_delete=models.SET_NULL, null=True)
    level = models.ForeignKey(level, on_delete=models.SET_NULL, null=True)
    activity = models.ForeignKey(activity, on_delete=models.SET_NULL, null=True)
    subactivity = models.ForeignKey(sub_activity, on_delete=models.SET_NULL, 
null=True)
    duration = models.IntegerField()
    linkactivity = models.CharField(max_length=300, null=True, blank=True)
    linktype = models.CharField(choices=choicestype, max_length=300, null=True, 
blank=True)
    linkduration = models.IntegerField(default=0)
    plannedstart = models.DateField(null=True, blank=True)
    plannedfinish = models.DateField(null=True, blank=True)
    actualstart = models.DateField(null=True, blank=True)
    actualfinish = models.DateField(null=True, blank=True)

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