下拉单选框的数据库中存储了什么？ （姜戈）

Question

I have the Dropdown Single Select Box "Month" with 3 options "January", "February" and "March" as shown below:

This is the code for the Dropdown Single Select Box "Month" in "Date" class below:

# "store/models.py"

from django.db import models

class Date(models.Model):
    class Months(models.TextChoices):
        JANUARY  = 'JAN', 'January'
        FEBRUARY = 'FEB', 'February'
        MARCH    = 'MAR', 'March'
    
    month = models.CharField(max_length=100, choices=Months.choices)

And, this is the old version code for the Dropdown Single Select Box "Month" in "Date" class below which is equivalent to the above code:

# "store/models.py"

from django.db import models

class Date(models.Model):
    JANUARY  = 'JAN'
    FEBRUARY = 'FEB'
    MARCH    = 'MAR'

    MANTHS = [
        (JANUARY,  'January'),
        (FEBRUARY, 'February'),
        (MARCH,    'March')
    ]

    month = models.CharField(max_length=100, choices=MANTHS)

Now, if I choose "February" and click on "SAVE" , what is stored in database? "FEBRUARY" ? "FEB" ? or "February" ?

Answer 1

"FEB" is stored in database. Actually as shown below, "FEBRUARY" is just a variable and "FEB" is the value stored in DB(Database) and "February" is the option displayed in the Dropdown Single Select Box "Month" on "Add date" page of Django Admin(GUI) :

# "store/models.py"

from django.db import models

class Date(models.Model):
    class Months(models.TextChoices):
     # |Variable|  | DB | | Option |
        JANUARY  = 'JAN', 'January'
        FEBRUARY = 'FEB', 'February'
        MARCH    = 'MAR', 'March'
    
    month = models.CharField(max_length=100, choices=Months.choices)

For the old version code below:

# "store/models.py"

from django.db import models

class Date(models.Model):
 # |Variable|  | DB | 
    JANUARY  = 'JAN'
    FEBRUARY = 'FEB'
    MARCH    = 'MAR'

    MANTHS = [
      # |Variable| | Option |
        (JANUARY,  'January'),
        (FEBRUARY, 'February'),
        (MARCH,    'March')
    ]

    month = models.CharField(max_length=100, choices=MANTHS)

And as shown below, "FEB" is stored in database(SQLite)

In addition, by adding this code below to "Date" class :

def __str__(self):
    return self.month

You can check what is stored in database on "Select date to change" page of Django Admin(GUI) as shown below:

This is the full code below:

# "store/models.py"

from django.db import models

class Date(models.Model):
    class Months(models.TextChoices):
     # |Variable|  | DB | | Option |
        JANUARY  = 'JAN', 'January'
        FEBRUARY = 'FEB', 'February'
        MARCH    = 'MAR', 'March'
    
    month = models.CharField(max_length=100, choices=Months.choices)

    def __str__(self):
        return self.month

And, this is the full code for the old version below:

# "store/models.py"

from django.db import models

class Date(models.Model):
 # |Variable|  | DB | 
    JANUARY  = 'JAN'
    FEBRUARY = 'FEB'
    MARCH    = 'MAR'

    MANTHS = [
      # |Variable| | Option |
        (JANUARY,  'January'),
        (FEBRUARY, 'February'),
        (MARCH,    'March')
    ]

    month = models.CharField(max_length=100, choices=MANTHS)

    def __str__(self):
        return self.month