Thanks very much. I have solved the problem.
On Sunday, May 20, 2018, Daniel Germano Travieso <danielgtravi...@gmail.com>
wrote:
> Hello!
>
> On your case, as stated on the official doc, you should just create a
> method on the model you want to display the ManyToMany field on the
> list_display that maybe returns the list of items from the ManyToMany
> field. Django avoids using this as it could be a potential overhead as you
> will run seperate queries on the database to fetch all the related
> many-to-many objects.
>
> But if you are feeling adventurous, just create the method that performs
> that query.
>
> i.e. On your Book model you create a method that returns the
> self.authors.all() set. Then you use that method's name on the list_display
> instead of authors.
>
> Hope it helps.
>
> On Saturday, May 19, 2018 at 3:54:17 PM UTC-3, Godson Rapture wrote:
>>
>> Please I am learning Django 2.0.4
>>
>>
>> Right now I am learning about Django Admin.
>>
>>
>> I got an error that the value of my list_display should not be a
>> ManyToMany Field.
>>
>>
>> I referred back to Django official doc and I was asked to create a custom
>> method for my model.
>>
>>
>> I tried looking for an example of how to do that, I could not see.
>>
>>
>> Here is my model.py program
>>
>> from django.db import models
>>
>> class Publisher(models.Model):
>> name = models.CharField(max_length=30)
>> address = models.CharField(max_length=50,blank=True)
>> city = models.CharField(max_length=60,blank=True)
>> country = models.CharField(max_length=50,blank=True)
>> website = models.URLField()
>> def __str__(self):
>> return self.name
>>
>> class Author(models.Model):
>> salution = models.CharField(max_length=10)
>> first_name = models.CharField(max_length=30)
>> last_name = models.CharField(max_length=40)
>> email = models.EmailField()
>> headshot = models.ImageField(upload_to = "tmp")
>> def __str__(self):
>> return f"{self.first_name} {self.last_name}"
>>
>> class Book(models.Model):
>> title = models.CharField(max_length=100)
>> authors = models.ManyToManyField(Author)
>> publisher = models.ForeignKey(Publisher,on_delete=models.CASCADE,)
>> publication_date = models.DateField()
>> def __str__(self):
>> return self.title
>>
>> Here is my admin.py program
>>
>> from django.contrib import admin
>> from polls.models import Book, Publisher, Author
>> # Register your models here.
>>
>> class BookAdmin(admin.ModelAdmin):
>> list_display = [
>> "title",
>> "authors", #a ManyToMany Field
>>
>> ]
>> search_fields = [
>> "Book"
>> ]
>> class Meta:
>> model = Book
>>
>> admin.site.register(Book, BookAdmin)
>>
>> Can someone please help me.
>>
>> Thanks.
>>
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