Ticket #2495: hack-mysql-TextField-index.patch

django/db/backends/mysql/creation.py

@@ -63 +63 @@
                 field.rel.to._meta.db_table, field.rel.to._meta.pk.column)
             ]
         return table_output, deferred
-        
- No newline at end of file
+        
+    def sql_indexes_for_field(self, model, f, style):
+        """ Hack the return-value of 
+            BaseDatabaseCreation.sql_indexes_for_field() to add a
+            prefix length to the TextField which is currently 
+            represented by MySQL's 'longtext' type -- which requires
+            a prefix-length parameter in order to install an index. 
+
+            All other types are passed unchanged.
+        """
+
+        qn = self.connection.ops.quote_name
+        out = super(DatabaseCreation, self).sql_indexes_for_field(model, f, style)
+
+        if not out or not f.db_type() == self.data_types['TextField']:
+            return out
+
+        field = "%s" % style.SQL_FIELD(qn(f.column))
+
+        newout = []
+        for item in out:
+            # 1000-byte prefix length maximum (apparently), else warning
+            newout = [item.replace(field, "%s(1000)" % field)]
+
+        return newout
+