django email list field

Question

I want to create field that hods list of emails. My model is like this :

class Alerts(models.Model):
    emails = MultiEmailField()
    events = models.OneToOneField(Event, on_delete=models.CASCADE)

All good, but when this models is saved in DB it is like this

{
"id": 11,
"emails": "['[email protected],  [email protected]']",
"events": 13
}

The list in 'emails' key is represented as a string "['[email protected], [email protected]']" , not as a list ['[email protected], [email protected]']. I tried different method, parsers and approaches, but without success. Is there a way to save list in DB or not? If it is the second is there a way to receive back a list as a response, not a string, that is fine too. ( DB is MYSQL)

There is no data type in MySQL to store ***an array of items***. The `MultiEmailField` is a wrapper which helps you to save/store some data in list/array form. — JPG, Aug 18 '20 at 14:37

score 1 · Answer 1 · answered Aug 18 '20 at 14:42

1

Django 3.1 added models.JsonField which can be used for all DB backends. You can use this to store a list

class Alerts(models.Model):
    emails = models.JsonField()

answered Aug 18 '20 at 14:42

Iain Shelvington

31,030
3
31
50

yeeah, that's fine, but we don't use this version in our project, it's not option for me – htodev Aug 18 '20 at 14:48
You can use JsonField as an external package https://pypi.org/project/django-jsonfield/ – Rarblack Aug 18 '20 at 15:18
I think that [`ListCharField`](https://django-mysql.readthedocs.io/en/latest/model_fields/list_fields.html#django_mysql.models.ListCharField) from `django-mysql` will be more suitable way in this case. – Timofey Katalnikov Aug 18 '20 at 15:23

score 0 · Answer 2 · answered Aug 18 '20 at 14:39

0

You can just split the string to get the emails in a list like this:

email_list = emails.replace("['", "").replace("']", "").split(",  ")

answered Aug 18 '20 at 14:39

dacx

824
1
9
18

it run into my mind, but it's not clean and convenient way – htodev Aug 18 '20 at 14:50

score 0 · Accepted Answer · answered Aug 18 '20 at 15:14

0

You can use ListCharField from django-mysql lib.

from django.db import models
from django_mysql.models import ListCharField

class Alerts(models.Model):
    emails = ListCharField(
        base_field=models.EmailField(...),
        ...
    )
    events = models.OneToOneField(Event, on_delete=models.CASCADE)

answered Aug 18 '20 at 15:14

Timofey Katalnikov

141
3
14

болшой спасибо Timofey Katalnikov, that works perfect for me – htodev Aug 19 '20 at 07:37

score 0 · Answer 4 · answered Aug 18 '20 at 15:24

Building on the answer of Dacx. And from https://stackoverflow.com/a/1894296/5731101

How about:

import ast

class Alerts(models.Model):
    raw_emails = MultiEmailField()
    events = models.OneToOneField(Event, on_delete=models.CASCADE)

    @property
    def emails(self):
        return ast.literal_eval(self.raw_emails)

django email list field

4 Answers4