Models

Model field reference

True면 null허용 - Database에 Null값저장여부

True면 blank허용, Field.null은 False True 인 경우 필드를 비워 둘 수 있습니다. 이것은 null과 다른데요. null은 순전히 데이터베이스와 관련이있는 반면 blank는 유효성 검사와 관련됩니다.

YEAR_IN_SCHOOL_CHOICES = [
    ('FR', 'Freshman'),
    ('SO', 'Sophomore'),
    ('JR', 'Junior'),
    ('SR', 'Senior'),
    ('GR', 'Graduate'),
]

Database column의 이름

True면 필드에 대한 database index를 생성한다.

이 field의 index에 대한 tablespace name

default값

False면 Admin, ModelForm에 보여지지 않는다. model validation또한 skip. default로 True.

The error_messages argument lets you override the default messages that the field will raise.

Form field에 extra help

True - primary key

If True, this field must be unique throughout the table.

Set this to the name of a DateField or DateTimeField to require that this field be unique for the value of the date field.

Like unique_for_date, but requires the field to be unique with respect to the month.

Like unique_for_date and unique_for_month.

A human-readable name for the field.

A list of validators to run for this field.

쓸데없이 왜 이렇게 많은 거야!

• CharField.max_length
• DecimalField.decimal_places

• DecimalField.max_digits

• to_field
• on_delete

            if field.name == 'code_kind':
                print(f"{field.name} <- MARO_DOMAIN_CD")
                print(f"{field.attname} <- attname")
                print("ForeignKey : {}.".format(isinstance(field, models.ForeignKey)))
                print("ManyToManyField : {}.".format(isinstance(field, models.ManyToManyField)))
                print("OneToOneField : {}.".format(isinstance(field, models.OneToOneField)))
                print("Field : {}.".format(isinstance(field, models.Field)))
                if isinstance(field, models.ForeignKey):
                    print(f"field.deconstruct 3:{ field.deconstruct()[3] }")
                    print(item.code_kind.__class__.objects.get(code_kind='MARO_DOMAIN_CD'))
                    print(item.code_kind.__class__.objects.get(code_kind='LANG_CD'))
                    print(f"field.deconstruct:{ field.deconstruct() }")
                    print(f"target_field:{ field.target_field }")
                    print(f"db_constraint:{ field.db_constraint }")
                    print(f"field.db_column(현 테이블의 column명):{ field.db_column }")
                    pass
                print(field.key)
                print(item.code_kind)
                print(type(item.code_kind))
                print(item.code_kind.objects.get(code_kind='MARO_DOMAIN_CD'))
 
                item.code_kind = 'MARO_DOMAIN_CD'
            else:
                print(field.name)

Returns a 4-tuple with enough information to recreate the field:

1. The name of the field on the model.
2. The import path of the field (e.g. “django.db.models.IntegerField”). This should be the most portable version, so less specific may be better.
3. A list of positional arguments.
4. A dict of keyword arguments.

This method must be added to fields prior to 1.7 to migrate its data using Migrations.

• Field.auto_created
• Field.concrete
• Field.hidden
• Field.is_relation
• Field.model

• Field.many_to_many
• Field.many_to_one
• Field.one_to_many
• Field.one_to_one
• Field.related_model - Points to the model the field relates to.