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shaib committed 1b996a5

MSSQL: Create UNIQUE constraint when necessary in alter_column

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Files changed (1)

south/db/sql_server/pyodbc.py

         ret_val = super(DatabaseOperations, self).alter_column(table_name, name, field, explicit_name, ignore_constraints=True)
         
         if not ignore_constraints:
+            unique_field_handled = False
             for cname, (ctype,args) in constraints.items():
                 params = dict(table = table,
                               constraint = qn(cname))
                 if ctype=='UNIQUE':
-                    #TODO: This preserves UNIQUE constraints, but does not yet create them when necessary
+                    if len(args)==1:
+                        unique_field_handled = True # 
                     if len(args)>1 or field.unique:
                         params['columns'] = ", ".join(map(qn,args))
                         sql = self.create_unique_sql % params
+                    else:
+                        continue
                 elif ctype=='PRIMARY KEY':
                     params['columns'] = ", ".join(map(qn,args))
                     sql = self.create_primary_key_string % params
                 else:
                     raise NotImplementedError("Don't know how to handle constraints of type "+ type)                    
                 self.execute(sql, [])
+            # Create unique constraint if necessary
+            if field.unique and not unique_field_handled:
+                self.create_unique(table_name, (name,))
             # Create foreign key if necessary
             if field.rel and self.supports_foreign_keys:
                 self.execute(
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