无法添加或更新子行：Django生成的MySQL表上的外键约束失败

Question

I am working on a django based project which created two tables table1 and table2 with a foreign key from table2 to table1 . I need to insert some values manually into table2 . On trying to do so in MySQL I get the constraint failure error. I checked thoroughly, corresponding entries required for a foreign key constraint already exist in table1 . I looked into some previous questions on SO but could not find an appropriate solution.

Table1 Schema:

+------------+---------------+------+-----+---------+----------------+
| Field      | Type          | Null | Key | Default | Extra          |
+------------+---------------+------+-----+---------+----------------+
| id         | int(11)       | NO   | PRI | NULL    | auto_increment |
| email      | varchar(100)  | NO   |     | NULL    |                |

Table 2:

+-------------+---------------+------+-----+---------+----------------+
| Field       | Type          | Null | Key | Default | Extra          |
+-------------+---------------+------+-----+---------+----------------+
| id          | int(11)       | NO   | PRI | NULL    | auto_increment |
| km          | varchar(1000) | YES  |     | NULL    |                |
| owner_id    | int(11)       | NO   | MUL | NULL    |                |
| receiver_id | int(11)       | NO   | MUL | NULL    |                |
+-------------+---------------+------+-----+---------+----------------+

The insert statement insert into crest_recipient values(id,owner_id=5,receiver_id=5,km="hello world"); or similar ones fail with the exact error as

Cannot add or update a child row: a foreign key constraint fails (crest.crest_recipient CONSTRAINT crest_recipient_owner_id_4943116a1387be04_fk_crest_user_id FOREIGN KEY (owner_id) REFERENCES crest_user (id))

Answer 1

You are trying to insert a row in child table crest_recipient which does not exist in parent table crest_user.

So first insert corresponding row in master table then you can insert in child table.

Answer 2

You are attempting to update or insert a row in crest.crest_recipient table, a value in column owner_id

that does not exist in crest_user column id

Edit

make it look like this

insert crest_recipient (km,owner_id,receiver_id) values ('test',5,1)

'test',5,1 are whatever you want.

Skip the id column. Don't specify it, don't supply the value for it. It is an auto_increment PK most likely (basically there is nothing else it can be). The db engine chooses it for you. Specifying it will just screw things up 99% of the time.

Focus on parameter 2 for now (the 5)