GaramX

이 문서는 읽기 전용입니다. 원본을 볼 수는 있지만 바꿀 수는 없습니다. 문제가 있다고 생각하면 관리자에게 문의하세요.
====== 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 ===
<code python>
YEAR_IN_SCHOOL_CHOICES = [
    ('FR', 'Freshman'),
    ('SO', 'Sophomore'),
    ('JR', 'Junior'),
    ('SR', 'Senior'),
    ('GR', 'Graduate'),
]
</code>

=== 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

<code python>
            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)
</code>
=== 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.
GaramX

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