Re: Please I need help on how to create a custom method for a model with list_display

2018-05-20 Thread Godson Rapture 
Thanks very much. I have solved the problem.

On Sunday, May 20, 2018, Daniel Germano Travieso 
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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Re: Please I need help on how to create a custom method for a model with list_display

2018-05-19 Thread Daniel Germano Travieso 
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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Please I need help on how to create a custom method for a model with list_display

2018-05-19 Thread Godson Rapture 


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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