CODEWITHSUNDEEP
pythondjango-modelsdjango-admin
Edgar González
Edgar González

Reputation: 151

Error with "__str__ returned non-string (type int)"

I have a problem with a Django Project.

I'll be direct. I am connecting my Django admin to a database that I have on a server, the problem is that when accessing the models in the browser, throws the following error:

TypeError at /admin/crm/asentamiento/78967/
__str__ returned non-string (type int)
Request Method: GET
Request URL:    http://127.0.0.1:8080/admin/crm/asentamiento/78967/
Django Version: 1.8
Exception Type: TypeError
Exception Value:    
__str__ returned non-string (type int)
Exception Location: C:\Spameando\crm_denue2\myvenv\lib\site-packages\django\utils\encoding.py in force_text, line 90
Python Executable:  C:\Spameando\crm_denue2\myvenv\Scripts\python3.exe
Python Version: 3.4.4

And the code for my model is this:

class Asentamiento(models.Model):
    id_asentamiento = models.AutoField(primary_key=True)
    nom_asentamiento = models.CharField(max_length=150)
    tipo_centro = models.CharField(max_length=100)
    nom_centro = models.CharField(max_length=100)
    num_local = models.CharField(max_length=20)
    tipo_asentamiento_id_tipo_asent = models.ForeignKey('TipoAsentamiento', db_column='tipo_asentamiento_id_tipo_asent')
    codigo_postal_id_codpostal = models.ForeignKey('CodigoPostal', db_column='codigo_postal_id_codpostal')
    localidad_id_localidad = models.ForeignKey('Localidad', db_column='localidad_id_localidad')

    class Meta:
        managed = False
        db_table = 'asentamiento'

    def __str__(self):
            return self.nom_asentamiento

I have no idea what the problem is, since I have done the model many times and I always throw the same error, in all other tables and models I have no problem.

The error occurs when I click on some value of my model to see in a window the selected value.

Upvotes: 15

Views: 30869

Answers (9)

Tedi Rusmana
Tedi Rusmana

Reputation: 1

in models example:

class tests(models.Model):
jw = models.IntegerField()

def __str__(self):
    return str(self.jw)

Upvotes: 0

Rodney
Rodney

Reputation: 1

This issue could arise if one of the foreign key fields returns models.IntegerField(). This happened to me, and I had to be sure that the foreign keys also returned models.Charfield() types.

Upvotes: 0

rangarajan
rangarajan

Reputation: 191

Here you're not getting this error because of the return type of Asentamiento model. It return CharField not an Integer type (as mentioned in the error message.)

The error may be due to the return type of TipoAsentamiento, CodigoPostal or the Localidad model. Since these models have One to Many Relationship with the Asentamiento model.

If you're not sure about the return types of these models, then you need to add __str__() method in the model and return a CharField or any other non integer field.

For example, If you want to return a PositiveIntegerField,

def __str__(self):
   return str(self.positive_integer_field_name)
# here, you need to use the str() method to convert the return type into a string.

If you want to return a Non Integer Field,

def __str__(self):
   return self.non_integer_field_name

Upvotes: 2

Manoj kumar N
Manoj kumar N

Reputation: 1

I use which field we want to represent in our admin pannel.
Put that field in a string representation, in my case:

def__str__:
  return self.user.username

Upvotes: 0

RTK
RTK

Reputation: 37

I just face this issue and I think if we put str() before self.field will not solve our problem. even tho I commented out that __str__ method after running the migrations command I'm facing this issue again and again.

issue cause:-

the main issue is with your other model that is having any relationship to this model and in that model, you are doing as usual __str__ method!

you should check put str() before that model that is having Manytoone relation ship with your model!

Upvotes: 0

Pravin L
Pravin L

Reputation: 37

For me its because i returned object instead of string, so i changed

 def __str__(self):
    return self.user

to

 def __str__(self):
    return self.user.email

Upvotes: 0

Laxmikant Ratnaparkhi
Laxmikant Ratnaparkhi

Reputation: 5023

I had default code created by VSCode, which was returning pk.

Changed

  def __str__(self):
      return self.pk

to:

  def __str__(self):
      return self.title # title is the field from my model

Upvotes: 1

E. Lizbeth
E. Lizbeth

Reputation: 117

Maybe this will help, I had a similar problem recently:

def __str__(self):
   return 'Asentamiento: {} {} {} {} {} '.format(self.id_asentamiento, self.nom_asentamiento, self.tipo_centro, self.nom_centro, self.num_local)

I hope it works for you, regards

Upvotes: 5

Elliot Roberts
Elliot Roberts

Reputation: 940

Just put str() here:

def __str__(self):
       return str(self.nom_asentamiento)

Upvotes: 21

Related Questions