I am using Django with mysql. I have created models.py
using command inspectdb
from existing database in mysql. It has a model as below:
class Participationdata(models.Model):
userid = models.ForeignKey('Volunteer', models.DO_NOTHING, db_column='UserId') # Field name made lowercase.
eventid = models.ForeignKey('Events', models.DO_NOTHING, db_column='EventId') # Field name made lowercase.
ptrflag = models.IntegerField(db_column='PtrFlag', blank=True, null=True) # Field name made lowercase.
class Meta:
managed = False
db_table = 'ParticipationData'
unique_together = (('userid', 'eventid'),)
I have inserted the data into database using this model successfully. But while selecting data it is showing the error like:
django.db.utils.OperationalError: (1054, "Unknown column 'Participationdata.id' in 'field list'")
How should I resolve this?
您在Participationdate
表中是否有id
字段?
Usually you would set primary_key = True
on your eventid
field, so Django uses it as a default id
. Look at the answer in Custom id field in Django model
But it is a ForeignKeyField
, so you have to add id column to your database and model. You can remove managed = False
(default is True
) and then:
migrate --fake-initial
(since you have table already, see more: https://docs.djangoproject.com/en/1.10/ref/django-admin/#cmdoption-migrate-fake-initial ) AutoField id
to your model makemigrations
and migrate
as usual. That way django uses your already-existing table, but you can modify it via models.
I solve this error when I add primary_key=True
to my id, because Django need a primary key. In my code, I add the primary key in my View id, because the inspectdb
don't get the key from the database view
class ViewRespuestaEncuestas(models.Model):
id_encuesta = models.IntegerField(primary_key=True)
encuesta = models.CharField(max_length=45, db_collation='utf8_general_ci')
id_usuario = models.IntegerField()
nombre_usuario = models.CharField(
max_length=40, db_collation='utf8_general_ci', blank=True, null=True)
id_pregunta = models.IntegerField()
pregunta = models.TextField(db_collation='utf8_general_ci')
id_respuesta = models.IntegerField()
respuesta = models.CharField(max_length=60, db_collation='utf8_general_ci')
valor = models.IntegerField(blank=True, null=True)
class Meta:
managed = False # Created from a view. Don't remove.
db_table = 'view_respuesta_encuestas'
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