如何从列表中选择默认选择字段

Question

In a django model I need to set a default for a choice field but I don't get how to do the syntax part

This is the list

CHAT_STYLES = [
    ("orange", "orange"),
    ("purple", "purple"),
    ("aquamarine", "aquamarine"),
    ("aqua", "aqua"),
    ("beige", "beige"),
    ("yellow", "yellow"),
    ("green", "green"),
    ("blue", "blue")
]

I tried to do like this

chat_styles = models.CharField(max_length=2, choices=CHAT_STYLES, default=CHAT_STYLES."purple")

or

 chat_styles = models.CharField(max_length=2, choices=CHAT_STYLES, default=CHAT_STYLES["purple"])

but it didn't work

Answer 1

You can use a TextChoices model to name all your choices and then use a name from those choices to set a default in the related model. Here, the max length is set to 10 as the longest value to be inserted in the field (aquamarine) is 10 characters long.

class ChatStyleModel(models.TextChoices):
    orange = ("orange", "orange")
    purple = ("purple", "purple")
    aquamarine = ("aquamarine", "aquamarine")
    aqua = ("aqua", "aqua")
    beige = ("beige", "beige")  
    yellow = ("yellow", "yellow")
    green = ("green", "green")
    blue = ("blue", "blue")

class ChatModel(models.Model):
    chat_styles = models.CharField(max_length=10, choices=ChatStyleModel.choices, default=ChatStyleModel.purple)

Answer 2

max length should be 10, because aquamarine is the biggest string and has 10 characters. try this: chat_styles = models.CharField(max_length=10, choices=CHAT_STYLES, default='purple')