I am writing a title formatter for display suite, but title isn't a 'CCK' type. Can anyone help me out with how to define the formatter ?
3 Answers
What do you mean the title isn't a "CCK" type? It should be a Field. Try this module: http://drupal.org/project/custom_formatters

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The title field is different from other fields. Custom formatters can't be used to create formatters for titles. – Nealv Aug 11 '12 at 12:34
Since title is a property, not a field, you cannot use a field formatter.
You'll need to take another approach to solve this problem, for example override the node template file, implement a hook_preprocess function, or implement hook_node_view.
edit: There are lots of discussions about properties versus fields. Here are some links to get you started with some background about why title is still a property, as well as some related modules.
- http://drupal.org/node/557292 - Issue: Convert node title to fields
- http://drupal.org/node/571654 - Issue: Revert node titles as fields
Note: I have not used all these modules and do not endorse them in any way, and don't claim that they address your question. This is just a short listing for your edification:

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There is an issue for the custom formatters module about that: #816924: Custom formatter for title field?

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