[Solved]-Django – How to prevent database foreign key constraint creation


django development version has a db_constraint field for ForeignKey model field – docs.



If you set managed=False (Django docs) in your model’s Meta class, Django will not create the table when you run syncdb.

class AssessmentLocation(models.Model):
    name = models.CharField(max_length=150)
    org  = models.ForeignKey(OrgCode)

    class Meta:
        managed = False

Django has a hook to provide initial sql data. We can (ab?)use this to get Django to create the table immediately after running syncdb.

Create a file myapp/sql/assessmentlocation.sql, containing the create table statement:

CREATE TABLE [main_assessmentlocation] (
    [id] int IDENTITY (1, 1) NOT NULL PRIMARY KEY,
    [name] nvarchar(150) NOT NULL,
    [org] int, -- NO FK CONSTRAINT ANYMORE --

If you have other models with foreign keys to the AssessmentLocation model, you may have problems if Django tries to apply the foreign key constraint before executing the custom sql to create the table. Otherwise, I think this approach will work.

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