on delete 3dmodels cascade

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Fabian
23 Jan 2017
1There are seven possible actions to take when such event occurs:
2
3CASCADE: When the referenced object is deleted, also delete the objects that have references to it 
4  (when you remove a blog post for instance, you might want to delete comments as well). 
5  SQL equivalent: CASCADE.
6      
7PROTECT: Forbid the deletion of the referenced object. 
8  To delete it you will have to delete all objects that reference it manually. 
9  SQL equivalent: RESTRICT.
10    
11RESTRICT: (introduced in Django 3.1) Similar behavior as PROTECT that matches SQL's RESTRICT more accurately. (See django documentation example)
12SET_NULL: Set the reference to NULL (requires the field to be nullable). 
13  For instance, when you delete a User, you might want to keep the comments he posted on blog posts, 
14  but say it was posted by an anonymous (or deleted) user. 
15  SQL equivalent: SET NULL.
16    
17SET_DEFAULT: Set the default value. SQL equivalent: SET DEFAULT.
18    
19SET(...): Set a given value. This one is not part of the SQL standard and is entirely handled by Django.
20  
21DO_NOTHING: Probably a very bad idea since this would create integrity issues in your database 
22  (referencing an object that actually doesn't exist). SQL equivalent: NO ACTION.
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Erik
10 Jan 2017
1on_delete=models.CASCADE will delete anything created by the admin if
2the admin user is deleted.
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Gian
18 Mar 2016
1CREATE TABLE child_table
2(
3  column1 datatype [ NULL | NOT NULL ],
4  column2 datatype [ NULL | NOT NULL ],
5  ...
6
7  CONSTRAINT fk_name
8    FOREIGN KEY (child_col1, child_col2, ... child_col_n)
9    REFERENCES parent_table (parent_col1, parent_col2, ... parent_col_n)
10    ON DELETE CASCADE
11    [ ON UPDATE { NO ACTION | CASCADE | SET NULL | SET DEFAULT } ] 
12);
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