CODEWITHSUNDEEP
djangopython-3.x
Bussiere
Bussiere

Reputation: 1154

Object in django admin for a foreignkey :

I have this object in my django model : 

class Stock(models.Model):
    name =  models.CharField(null=True,blank=True,max_length=20)
    def ___str__(self):
        return self.name
    def __unicode__(self):
        return self.name

When I see it in the django admin it works well.

But in the admin when I want to see this object : 

class StockData(models.Model):
    stock = models.ForeignKey(Stock,on_delete=models.PROTECT,null=True,blank=True)
    date = models.DateTimeField(null=True,blank=True)
    interval = models.CharField(null=True, blank=True,max_length=2)

    def ___str__(self):
        return self.stock+ ":" + str(self.date)
    def __unicode__(self):
        return self.stock + ":" + str(self.date)

with this admin : 

from django.contrib import admin
from .models import StockData

# Register your models here.
class StockData_Admin(admin.ModelAdmin):
    list_display = (
        'date',
        'stock',
        'interval'
    )

admin.site.register(StockData,StockData_Admin)

but in the admin page the stock object is represented as : 

Stock object (1)

edit :

enter image description here

So how to solve this ?

My django version :

>>> import django
>>> django.VERSION 
(2, 0, 0, 'final', 0)

Thanks and regards

Upvotes: 1

Views: 1501

Answers (2)

umgelurgel
umgelurgel

Reputation: 312

There's a typo in your Stock definition - Python's magic methods start and end with double underscore, Stock's str currently starts with three underscores instead of two. When the Stock instance is printed, it falls back to the models.Model default str implementation. Once the suprefluous underscore is removed, you will see the Stock displayed correctly:

Fixed admin dashboad

Upvotes: 7

Dimitris Kougioumtzis
Dimitris Kougioumtzis

Reputation: 2439

In models.py try something like this (not tested)

class Stock(models.Model):

  name =  models.CharField(blank=True,max_length=20)
  # charfield default value is empty string so null true not needed

  def __str__(self):
    title = 'Empty title'
    if self.name != '':
        title = self.name
    return title

  def __unicode__(self):
    title = 'Empty title'
    if self.name != '':
        title = self.name
    return title

class StockData(models.Model):
   stock = models.ForeignKey(Stock,on_delete=models.PROTECT,null=True,blank=True)
   date = models.DateTimeField(null=True,blank=True)
   interval = models.CharField(blank=True,max_length=2)

   def __str__(self):
      title = 'Empty title'
      if(all([self.stock, self.date])):
         title = '{}:{}'.format(self.stock, self.date)
      return title

   def __unicode__(self):
     title = ''
     if self.stock and self.date:
        title = self.stock + ':' + self.date
     return title

in admin.py try this 

class StockData_Admin(admin.ModelAdmin):
 list_display = (
    'get_date',
    'get_stock',
    'get_interval'
 )

 def get_date(self, obj):
     return obj.date

 def get_stock(self, obj):
     return obj.stock

 def get_interval(self, obj):
     return obj.interval

 get_date.empty_value_display = 'No available date'
 get_stock.empty_value_display = 'No available stock'
 get_interval.empty_value_display = 'No available interval'

 admin.site.register(StockData,StockData_Admin)

Upvotes: 0

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