====== Django Models ====== ===== Models ===== [[https://docs.djangoproject.com/en/4.0/topics/db/models/|Models]] ===== Field ===== [[https://docs.djangoproject.com/en/4.0/ref/models/fields/|Model field reference]] ==== Field options ==== === Field.null === True면 null허용 - Database에 Null값저장여부 === Field.blank === 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. === Field.choices ===


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

=== Filed.db_column === Database column의 이름 === Field.db_index === True면 필드에 대한 database index를 생성한다. === Field.db_tablespace === 이 field의 index에 대한 tablespace name === Field.default === default값 === Field.editable === False면 Admin, ModelForm에 보여지지 않는다. model validation또한 skip. default로 True. === Field.error_messages === The error_messages argument lets you override the default messages that the field will raise. === Field.help_text === Form field에 extra help === Field.primary_key === True - primary key === Field.unique === If True, this field must be unique throughout the table. === Field.unique_for_date === Set this to the name of a DateField or DateTimeField to require that this field be unique for the value of the date field. === Field.unique_for_month === Like unique_for_date, but requires the field to be unique with respect to the month. === Field.unique_for_year === Like unique_for_date and unique_for_month. === Field.verbose_name === A human-readable name for the field. === Field.validators === A list of validators to run for this field. ==== Field types ==== 쓸데없이 왜 이렇게 많은 거야! === AutoField === === BigAutoField === === BigIntegerField === === CharField === * CharField.max_length * DecimalField.decimal_places === DateField === === DateTimeField === === DecimalField === * DecimalField.max_digits === IntegerField === === TextField === === TimeField === ==== Relationship fields ==== === ForeignKey === * 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)

=== ManyToManyField === === OneToOneField === ==== Field API reference ==== === deconstruct() === Returns a 4-tuple with enough information to recreate the field: - The name of the field on the model. - 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. - A list of positional arguments. - A dict of keyword arguments. This method must be added to fields prior to 1.7 to migrate its data using Migrations. ==== Field attribute reference ==== === Attributes for fields === * Field.auto_created * Field.concrete * Field.hidden * Field.is_relation * Field.model === Attributes for fields with relations === * 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.