Is it possible to store an array in Django model?

Question

I was wondering if it\'s possible to store an array in a Django model?

I\'m asking this because I need to store an array of int (e.g [1,2,3]) in a field

Answer 1

I'd have two advices for you:

1) Use ArrayField if you are using PostgreSQL as your database. You can read more about ArrayField here.

2) Encode your array as JSON and store it either as a plain string or using a JSONField as found here.

I'd personally prefer option number 1 since that is the cleaner and nicer way but depending on what you are actually using to store your data that might not be available to you.

Answer 2

I don't know why nobody has suggested it, but you can always pickle things and put the result into a binary field.

The advantages of this method are that it will work with just about any database, it's efficient, and it's applicable to more than just arrays. The downside is that you can't have the database run queries on the pickled data (not easily, anyway).

Answer 3

Yes, you can use it like this:

from django.contrib.postgres.fields import ArrayField
class Board(models.Model):
    pieces = ArrayField(ArrayField(models.IntegerField()))

However, it can only be available when using PostgreSQL for the database.

Answer 4

you can store a json and good to go with sub arrays of that JSON:

if (data != "attachmentto") {
        formData.append(data, this.recipe[data])
        console.log('rec data ', data)}
        else if (data == "attachmentto") {
          console.log('rec data434 ', this.recipe.attachmentto)
          var myObj = { name: this.recipe.attachmentto.name, age: 31, city: "New York" };
          let kokos = JSON.stringify(myObj);
          // this.recipe.attachmentto.name = this.recipe.attachmentto.name
          formData.append('attachmentto', kokos)
        }

Django backend:

class Video(models.Model):
  objects = models.Manager()
  title = models.CharField(max_length=80)
  description = models.TextField(max_length=300)
  picture = JSONField(encoder=None)
  price = models.IntegerField(default=0)
  url = models.URLField()
  category = models.CharField(max_length=50)
  subcategory = models.TextField(max_length=50)
  attachmentto = JSONField(encoder=None)
  # attachmentto2 = models.JSONField()
  user = models.ForeignKey(User, on_delete=models.CASCADE, default=1)

and result on backend API:

   {
        "id": 174,
        "title": "ads",
        "description": "ads",
        "picture": {
            "name": "https://v3.vuejs.org/logo.png"
        },
        "price": 0,
        "user": 1,
        "rating_average": 0,
        "attachmentto": {
            "age": 31,
            "city": "New York",
            "name": [
                "https://restdj.herokuapp.com/media/uploads/ftf_3_cJ0V7TF.png",
                "https://restdj.herokuapp.com/media/uploads/ftf_3.jpg"
            ]
        }
    },

I call it noicely(nicely). Notice that we send a JSON and we have a array in that JSON

Kokos is the full JSON disagned for djangoo:

  var myObj = { name: this.recipe.attachmentto.name, age: 31, city: "New York" };



let kokos = JSON.stringify(myObj);

formData.append('attachmentto', kokos)

Above; name: this.recipe.attachmentto.name is an array

Here is the array: "name": [

"https://restdj.herokuapp.com/media/uploads/ftf_3_cJ0V7TF.png",
                "https://restdj.herokuapp.com/media/uploads/ftf_3.jpg"
            ]

Answer 5

If you aren't using Postgres, I recommend Django's validate_comma_separated_integer_list validator.

https://docs.djangoproject.com/en/dev/ref/validators/#django.core.validators.validate_comma_separated_integer_list

You use is as a validator on a CharField().