ManyToMany field creation problem

Hi,

I have these tables

on apps/common/models.py


class UnitType(models.Model):
    title = models.CharField(max_length=50)

    def __unicode__(self):
        return u'%s' % self.title

class UnitPrice(models.Model):
    project = models.ForeignKey('property.Property')
    unit_type = models.ForeignKey(UnitType)

    five_year_target_price = models.CharField(max_length=50, blank=True, null=True)
    per_sqft_price = models.CharField(max_length=50, blank=True, null=True)
    total_price = models.CharField(max_length=50, blank=True, null=True)
   
    total_area = models.CharField(max_length=140, blank=True, null=True)
    carpet_area = models.CharField(max_length=140, blank=True, null=True)

     def __unicode__(self):
        return u'%s' % self.title

and on apps/property/models.py


class Property(Base):
.....
.....
    unit_price = models.ManyToManyField(UnitType,through=UnitPrice, blank=True, null=True)

.....
.....

after adding the unit price field I did  a migration

      python manage.py schemamigration property --auto

I am getting this output

       Nothing seems to have changed.

the through table is created,  i have checked that.


                                         Table "public.common_unitprice"
         Column         |          Type          |                           Modifiers                          
------------------------+------------------------+---------------------------------------------------------------
 id                     | integer                | not null default nextval('common_unitprice_id_seq'::regclass)
 project_id             | integer                | not null
 unit_type_id           | integer                | not null
 five_year_target_price | character varying(50)  |
 per_sqft_price         | character varying(50)  |
 total_price            | character varying(50)  |
 total_area             | character varying(140) |
 carpet_area            | character varying(140) |
Indexes:
    "common_unitprice_pkey" PRIMARY KEY, btree (id)
    "common_unitprice_project_id" btree (project_id)
    "common_unitprice_unit_type_id" btree (unit_type_id)
Foreign-key constraints:
    "project_id_refs_id_7c43d44c" FOREIGN KEY (project_id) REFERENCES property_property(id) DEFERRABLE INITIALLY DEFERRED
    "unit_type_id_refs_id_1a1f3765" FOREIGN KEY (unit_type_id) REFERENCES common_unittype(id) DEFERRABLE INITIALLY DEFERRED

Any help??

Mrinmoy Das
http://goromlagche.in/

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