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

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

[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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inserting data in a DateTimeField() in Django by using datetime-local

[Godson Rapture]

Please, I am creating a to-do list app as my first django project.

My form is not valid because I am trying to insert DateTimeField in django
using datetime-local.

I did research, I discovered I need to do a custom model so I parse the
datetime-local field.

Pls guide me on how to create a custom model field.

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Re: Best Learning Resources

[Godson Rapture]

Check out the book "django for beginners "

On Wed, Jan 16, 2019, 2:19 PM  wrote:

> Hi All,
>
> I'm just starting out with Django and python and wondering if anyone can
> direct me to some goto learning resources. Beginner to Advanced
>
> Thanks
>
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> 
> .
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>

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Re: Pagination - Not Working

[Godson Rapture]

Can you upload your code on github let me check where your problem is?

On Tue, Feb 19, 2019, 6:43 AM Siddharth Tamang 
wrote:

> Are you trying pagination using JavaScript or Django?
>
> On Mon, Feb 18, 2019 at 11:47 PM Aakash Baranwal 
> wrote:
>
>> Hello Everyone,
>>
>> I am new to Django and working towards developing a web app where 10
>> posts appear at a time with a "Load More" option given at last which when
>> clicked shows the next 10 posts. I am not able to find what is going wrong
>> with the code.
>>
>> Also, it is not showing the character counter for the textbox, so kindly
>> help me with that as well.
>>
>> I am sending the screenshot of the code, pagination.py file.
>>
>> Thank You in advance
>>
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>> 
>> .
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>>
>
>
> --
> Thank you
> Siddharth Tamang
> AWS Certified Solutions Architect - Associate
>
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Re: Pagination - Not Working

[Godson Rapture]

Check out simple is better than complex blog. It should have a topic on
pagination to help you

On Tue, Feb 19, 2019, 9:20 AM Aakash Baranwal  wrote:

> Hello,
>
> Thanks for offering me your help, but the problem is I can't upload it on
> internet as I have signed a Non Disclosure Agreement for the project in
> which I am working, so totally helpless in this case.
>
> However I might be able to give a specific portion of what you might need
> for resolving this issue.
>
> I am extremely sorry about this.
>
> On Tue, Feb 19, 2019 at 1:38 PM Godson Rapture 
> wrote:
>
>> Can you upload your code on github let me check where your problem is?
>>
>> On Tue, Feb 19, 2019, 6:43 AM Siddharth Tamang <
>> tamangsiddhart...@gmail.com> wrote:
>>
>>> Are you trying pagination using JavaScript or Django?
>>>
>>> On Mon, Feb 18, 2019 at 11:47 PM Aakash Baranwal 
>>> wrote:
>>>
>>>> Hello Everyone,
>>>>
>>>> I am new to Django and working towards developing a web app where 10
>>>> posts appear at a time with a "Load More" option given at last which when
>>>> clicked shows the next 10 posts. I am not able to find what is going wrong
>>>> with the code.
>>>>
>>>> Also, it is not showing the character counter for the textbox, so
>>>> kindly help me with that as well.
>>>>
>>>> I am sending the screenshot of the code, pagination.py file.
>>>>
>>>> Thank You in advance
>>>>
>>>> --
>>>> You received this message because you are subscribed to the Google
>>>> Groups "Django users" group.
>>>> To unsubscribe from this group and stop receiving emails from it, send
>>>> an email to django-users+unsubscr...@googlegroups.com.
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>>>> .
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>>>>
>>>
>>>
>>> --
>>> Thank you
>>> Siddharth Tamang
>>> AWS Certified Solutions Architect - Associate
>>>
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