Backend DevelopmentPHP TutorialHow to Fix \'Unique Key is Too Long, Even if Specified\' Laravel Migration Error?
Laravel Migration Error: "Unique Key is Too Long, Even if Specified"
Laravel migration errors can arise when creating unique keys for columns that exceed the allowed maximum length. In the given scenario, the user ran into this issue while attempting to migrate a users table with an email column that had a length of 320 characters.
The error message indicates that the specified key (email) is too long, with a maximum key length of 767 bytes. To resolve this issue, the recommended solution is to reduce the length of the email column.
The default length for a string column in Laravel is 250 characters. By setting the email column to this length, the migration should succeed without the unique key length error. Alternatively, the email column can be set to a smaller length based on the specific requirements of the application.
For Laravel 5.4 and above, an additional solution is available. By editing the AppServiceProvider.php file and setting a default string length in the boot method, the maximum length of all string columns can be adjusted.
By setting the Builder::defaultStringLength to a smaller value, such as 191, the error should be resolved, and the migration can proceed successfully.
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