How can implement foreign key in admin and model - django

Question

Table1
sett_ num | Sett_typ
-----------------------------
2014232 N
2014232 S
2014232 O
Table2
stt_type_code | stt_typ_name
----------------------------
N Normal
S OPTIONS
O Index
this how the database looks for two table, here in table 1 i need display "Normal instead of N by referring the Table 2"
I have achieved this but the problem is the field i have made this change is not searchable and filters are not working properly
so I need to implement foreign key here can please you help me to solve this problem.
the model and admin look like this
Model.py(table 1)
class DLVR(models.Model):
sett_type = models.CharField(max_length=35, editable=False)
sett_num = models.CharField(max_length=7, editable=False)
Model.py(Table 2)
class Sttlmnt_typ_Master(models.Model):
stt_typ_code = models.CharField(max_length=10, editable=True)
stt_typ_name = models.CharField(max_length=35, editable=True)
Admin.py
class DLVRAdmin(admin.ModelAdmin):
list_display = ('sett_num','sett_type')
search_fields=['sett_num','sett_type']
def sett_type_display(self, obj):
if Sttlmnt_typ_Master.objects.filter(stt_typ_code=obj.sett_type).first():
sett_type = Sttlmnt_typ_Master.objects.filter(stt_typ_code=obj.sett_type).first()
return sett_type.stt_typ_name
else:
return obj.sett_type
This is the way i need to implement in foreign key way can anyone help? and please give me examples in model and admin.

Answer 1

Add primary_key parameter to Sttlmnt_typ_Master.stt_typ_code and then change DLVR.sett_type to foreign key:
class Sttlmnt_typ_Master(models.Model):
stt_typ_code = models.CharField(max_length=10, primary_key=True)
stt_typ_name = models.CharField(max_length=35)
def __unicode__(self):
return self.stt_typ_name
class DLVR(models.Model):
sett_type = models.ForeignKey(Sttlmnt_typ_Master)
sett_num = models.CharField(max_length=7)
Admin will be as simple as:
class DLVRAdmin(admin.ModelAdmin):
list_display = ['sett_type', 'sett_num']
search_fields=['sett_num','sett_type__stt_typ_name']
To set raw data to DLVR.sett_type (for example while import from CSV) add _id to field name:
DLVR.objects.create(sett_type_id='O', sett_num='2014232')