new_contents: # -*- coding: utf-8 -*-
  from __future__ import unicode_literals
  
  from django.db import connection, models, migrations
  import cityhallmonitor.models
  
  
  def add_document_gin_index_wt(apps, schema_editor):
      Document = apps.get_model('cityhallmonitor', 'Document')
      db_table = Document._meta.db_table
  
      with connection.cursor() as c:
          sql = "CREATE INDEX cityhallmonitor_document_text_vector_wt_gin ON %s USING gin(text_vector_weighted)" \
              % db_table
          c.execute(sql)
  
  
  class Migration(migrations.Migration):
  
      dependencies = [
          ('cityhallmonitor', '0019_auto_20151211_1424'),
      ]
  
      operations = [
          migrations.RunPython(add_document_gin_index_wt),
      ]
  
subject: Add migration command to create index on weighted vector field