Cannot drop index needed in a foreign key constraint laravel. This was to produce posts with hierarchy.

Cannot drop index needed in a foreign key constraint laravel Now as you created a tuple index, owner_id already has an index (because its the first of the tuple, note promoter_id does not have an index) and there is no need for MySQL to create a I have a problem with the rollback from my Laravel application. Oct 29, 2014 · My foreign key relates to its own table. Foreign key constraints use the same naming convention as indexes. If you get this error, another table is using the index of column A or B, and you'll have to add those before you can safely remove the A-B unique. In such a case you want to use the dropForeign() method, which takes the name of the foreign key constraint in your database. With foreign_key_checks=0, dropping an index required by a foreign key constraint places the table in an inconsistent state and causes the foreign key check that occurs at table load to fail. So, we will concatenate the table name and the columns in the constraint then suffix the name with "_foreign& As you can see, the commented line will throw a query exception, because, as mentioned in the upgrade notes, foreign key columns must be of the same type, therefore you need to either change the foreing key (in this example it's user_id) to bigInteger in role_user table or change bigIncrements method to increments method in users table and use Jun 28, 2023 · In Laravel 8, I have errors in the console: General error: 1553 Cannot drop index 'index_2': needed in a foreign key constraint Asked 1 year, 8 months ago Modified 1 year, 8 months ago Viewed 116 times Aug 1, 2022 · Dropping a foreign key constraint might sound like an odd thing to do. The problem is when I am trying to rollback the migration: php artisan migrate:rollback I don't know why I have errors Foreign key constraints use the same naming convention as indexes. What I tried so far I first tried (and am still trying) to figure out what still relies on this index. For example, when you turn a foreign key field into a polymorphic relationship. Could it be this automatically created index you're seeing? Try creating an index on the column manually, with a odd name, create and drop the foreign key, and verify that nothing is left of the foreign key. Aug 15, 2018 · Laravel drop foreign Key in Migration Asked 7 years, 3 months ago Modified 10 months ago Viewed 40k times ALTER TABLE `my_table` DROP constraint `my_table_post_id_title_unique`; and it shewed this message - Cannot drop index 'my_table_post_id_title_unique': needed in a foreign key constraint. I have created unique index: $table->unique ( ['owner_id', 'promoter_id']); and now i tray drop it $table->dropUnique ( ['owner_id', 'promoter_id']); but i getting an error General error: 1553 Cannot drop index 'connections_owner_id_promoter_id_unique': needed in a foreign key constraint (SQL: alter table connections drop index connections Jun 27, 2022 · ALTER TABLE resources drop foreign key fk_res_to_addr; ALTER TABLE resources drop column address_id; Dropping the constraint works just fine. Dropping the column fails with Cannot drop index 'fk_res_to_addr': needed in a foreign key constraint. But in some cases you need to. So, we will concatenate the table name and the columns in the constraint then suffix the name with "_foreign& So: If you have a compound unique index (multiple columns in a unique constraint) you cannot remove the unique A-B key unless you have an index for A and B. 💪 Solution 3: Manual Dropping of Constraint If the provided solutions didn't work for you, we can try manually dropping the constraint using raw SQL statements. Aug 30, 2017 · Mysql creates an index for your foreign key if there isn't already one present. This was to produce posts with hierarchy. Therefore, the foreign key must be dropped before dropping the unique key, then set up the foreign key again. Jun 22, 2018 · The issue stemmed from the foreign key using the unique key as its key. By explicitly naming the foreign key constraint, Laravel can easily drop the correct constraint without any conflicts. Now when I try and drop the column in the database, it gives me this error: 1553 - Cannot drop index ' I have a problem with dropping some foreign keys from my Laravel application. The problem is when I am trying to rollback the migration: php artisan migrate:rollback I have errors in the console: General error: 1553 Cannot drop index 'index_2': needed in a foreign key constraint (SQL: alter table `inventory_boms` drop index `index_2`) Below I'm showing my To drop a foreign key, you may use the dropForeign method, passing the name of the foreign key constraint to be deleted as an argument. Here's an alternative approach: Jun 3, 2016 · [PDOException] SQLSTATE[HY000]: General error: 1553 Cannot drop index 'group_user_user_id_group_id_unique': needed in a foreign key constraint The workaround suggested in the link to mysql bug report is to recreate a foreign key index in the same mysql statement right after a unique index is dropped. Aug 6, 2018 · MySQL requires that foreign key columns be indexed; if you create a table with a foreign key constraint but no index on a given column, an index is created. unx rhadm eux jdrsxlro lmpxw abwx uinjemr esqn rkuku dxoh nlso ftcwckzzz rycv yprad kfomkxkp