django - how to use contains or startwith in join query -

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i want use contains in join query gives error.

following models.py:

 class profile(models.model):      name = models.charfield(max_length=50, primary_key=true)      assign = models.charfield(max_length=50)      doj = models.datefield()      dob = models.datefield()       class meta:         db_table = u'profile'       def __str__(self):          return  '%s %s %s %s' % ( self.name,self.assign,self.doj,self.dob)       def __unicode__(self):          return  u'%s %s %s %s' % ( self.name,self.assign,self.doj,self.dob)       enter code here  class working(models.model):    w_name =models.foreignkey(profile, db_column='w_name')    monday =  models.integerfield(null=true, db_column='monday', blank=true)    tuesday =  models.integerfield(null=true, db_column='tuesday', blank=true)    wednesday =  models.integerfield(null=true, db_column='wednesday', blank=true)     class meta:         db_table = u'working'     def __str__(self):          return  '%s %s %s %s' % ( self.w_name,self.monday,self.tuesday,self.wednesday)     def __unicode__(self):          return  u'%s %s %s %s' % ( self.w_name,self.monday,self.tuesday,self.wednesday)

i want use this:

m = working.objects.filter(w_name__name__contains='sushanth')  or   m = working.objects.filter(w_name__name__startswith='sushanth')

the error keep getting:

     file "<console>", line 1, in <module>   file "/usr/local/lib/python2.6/dist-packages/django-1.2.4-py2.6.egg/django/db/models/manager.py", line 141, in filter     return self.get_query_set().filter(*args, **kwargs)   file "/usr/local/lib/python2.6/dist-packages/django-1.2.4-py2.6.egg/django/db/models/query.py", line 556, in filter     return self._filter_or_exclude(false, *args, **kwargs)   file "/usr/local/lib/python2.6/dist-packages/django-1.2.4-py2.6.egg/django/db/models/query.py", line 574, in _filter_or_exclude     clone.query.add_q(q(*args, **kwargs))   file "/usr/local/lib/python2.6/dist-packages/django-1.2.4-py2.6.egg/django/db/models/sql/query.py", line 1152, in add_q     can_reuse=used_aliases)   file "/usr/local/lib/python2.6/dist-packages/django-1.2.4-py2.6.egg/django/db/models/sql/query.py", line 1092, in add_filter     connector)   file "/usr/local/lib/python2.6/dist-packages/django-1.2.4-py2.6.egg/django/db/models/sql/where.py", line 67, in add     value = obj.prepare(lookup_type, value)   file "/usr/local/lib/python2.6/dist-packages/django-1.2.4-py2.6.egg/django/db/models/sql/where.py", line 316, in prepare     return self.field.get_prep_lookup(lookup_type, value)   file "/usr/local/lib/python2.6/dist-packages/django-1.2.4-py2.6.egg/django/db/models/fields/related.py", line 139, in get_prep_lookup     raise typeerror("related field has invalid lookup: %s" % lookup_type) typeerror: related field has invalid lookup: startswith

any suggestions??

is there reason why name field primary key?

if there isn't suggest recreating tables name field not primary key. might throwing filter logic out.


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