"""

Models can have a ``managed`` attribute, which specifies whether the SQL code

is generated for the table on various manage.py operations.

"""

from django.db import models

#  All of these models are created in the database by Django.

class A01(models.Model):

    f_a = models.CharField(max_length=10, db_index=True)

    f_b = models.IntegerField()

    class Meta:

        db_table = "a01"

class B01(models.Model):

    fk_a = models.ForeignKey(A01, models.CASCADE)

    f_a = models.CharField(max_length=10, db_index=True)

    f_b = models.IntegerField()

    class Meta:

        db_table = "b01"

        # 'managed' is True by default. This tests we can set it explicitly.

        managed = True

class C01(models.Model):

    mm_a = models.ManyToManyField(A01, db_table="d01")

    f_a = models.CharField(max_length=10, db_index=True)

    f_b = models.IntegerField()

    class Meta:

        db_table = "c01"

# All of these models use the same tables as the previous set (they are shadows

# of possibly a subset of the columns). There should be no creation errors,

# since we have told Django they aren't managed by Django.

class A02(models.Model):

    f_a = models.CharField(max_length=10, db_index=True)

    class Meta:

        db_table = "a01"

        managed = False

class B02(models.Model):

    class Meta:

        db_table = "b01"

        managed = False

    fk_a = models.ForeignKey(A02, models.CASCADE)

    f_a = models.CharField(max_length=10, db_index=True)

    f_b = models.IntegerField()

# To re-use the many-to-many intermediate table, we need to manually set up

# things up.

class C02(models.Model):

    mm_a = models.ManyToManyField(A02, through="Intermediate")

    f_a = models.CharField(max_length=10, db_index=True)

    f_b = models.IntegerField()

    class Meta:

        db_table = "c01"

        managed = False

class Intermediate(models.Model):

    a02 = models.ForeignKey(A02, models.CASCADE, db_column="a01_id")

    c02 = models.ForeignKey(C02, models.CASCADE, db_column="c01_id")

    class Meta:

        db_table = "d01"

        managed = False

# These next models test the creation (or not) of many to many join tables

# between managed and unmanaged models. A join table between two unmanaged

# models shouldn't be automatically created (see #10647).

#

# Firstly, we need some models that will create the tables, purely so that the

# tables are created. This is a test setup, not a requirement for unmanaged

# models.

class Proxy1(models.Model):

    class Meta:

        db_table = "unmanaged_models_proxy1"

class Proxy2(models.Model):

    class Meta:

        db_table = "unmanaged_models_proxy2"

class Unmanaged1(models.Model):

    class Meta:

        managed = False

        db_table = "unmanaged_models_proxy1"

# Unmanaged with an m2m to unmanaged: the intermediary table won't be created.

class Unmanaged2(models.Model):

    mm = models.ManyToManyField(Unmanaged1)

    class Meta:

        managed = False

        db_table = "unmanaged_models_proxy2"

# Here's an unmanaged model with an m2m to a managed one; the intermediary

# table *will* be created (unless given a custom `through` as for C02 above).

class Managed1(models.Model):

    mm = models.ManyToManyField(Unmanaged1)