I have this working fine with my postgresql backend. I created an index on the 
User entity. I have a Constraint Distinct on the login attribute. The index is 
named login_idx.

so in my ValidationTemplate.strings file I have:

{
        "UniqueConstraintException.login_idx" = "Please choose a different 
login (It must be unique).";
                
}

This doesn’t seem to work with a MySQL backend or I am not remembering to wire 
something else in. After I ran the migrations, I see the index on the table and 
I see the errors in my console:

EvaluateExpression failed: 
<com.webobjects.jdbcadaptor._MySQLPlugIn$MySQLExpression: "INSERT INTO 
User(unreadcount, website, title, phone, active, story, created, keywords, 
ipaddress, adjusted, status, lastlogin, kind, id, role, language, timezone, 
type, password, email) VALUES (NULL, NULL, ?, NULL, ?, NULL, ?, NULL, NULL, ?, 
NULL, NULL, NULL, ?, NULL, NULL, NULL, NULL, ?, ?)" withBindings: 
1:"User"(title), 2:true(active), 3:2017-01-17 04:09:40(created), 4:2017-01-17 
04:09:40(adjusted), 5:7(id), 6:"SlCWtgVlm5W/+zMGkl9pKcA1MMg="(password), 
7:"[email protected]"(email)>: Next exception:SQL State:23000 -- error code: 1062 -- 
msg: Duplicate entry '[email protected]' for key ‘login_idx'

there it is:
error code: 1062 -- msg: Duplicate entry '[email protected]' for key ‘login_idx'

so Mysql is complaining and i am not catching it correctly. Googling doesn’t 
seem to help here.

Ted
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