Show friendly errors instead of exceptions

[AndreaLopezLozano]

Show a friendly error message when it's not possible to delete a content because it has other contents related.

[ablunier]

After researching about this, we found out that the only way to do it is capturing the Illuminate\Database\QueryException and checking the SQLSTATE number and the error number obtaining them from the Exception instance errorInfo property ($e->errorInfo).

Which SQL errors should crud capture and show as user friendly messages?

• Error: 1451 SQLSTATE: 23000 (ER_ROW_IS_REFERENCED_2)
  Message: Cannot delete or update a parent row: a foreign key constraint fails (%s)
• Error: 1452 SQLSTATE: 23000 (ER_NO_REFERENCED_ROW_2)
  Message: Cannot add or update a child row: a foreign key constraint fails (%s)