Query Manipulation Server 25.3
Query Manipulation Server Help

# Filter Results

In some cases, you might want to restrict the results that a user receives as suggestions. You can apply filters to the TypeAhead action, depending on the mode that you are using.

- In Index mode, you can use a SecurityInfo string with the TypeAhead action. QMS forwards this string to the Content component index, and returns only terms that occur in documents that the user is permitted to see.

- In Index, Dictionary, and Answerbank modes, you can provide a Lua script that filters the suggestions that the TypeAhead action returns.

## Use a SecurityInfo String

When you are using the data index to provide suggestions, you can use the Knowledge Discovery security functionality to ensure that users see only suggestions that occur in at least one document that they are permitted to see.

You can set the SecurityInfo parameter in the TypeAhead action. QMS forwards this value to the Content component, which filters the results according to user permissions. You can generate the `SecurityInfo` string for a user by using the `UserRead` action for the Community component. For more information, refer to the Community Component Help.

## Use a Lua Script to Filter Results

You can configure and use a Lua script to filter the suggestions according to your own filtering criteria.

The Lua script that you create to filter results must contain a valid Lua function named `typeahead_filter` that accepts a string value and returns a Boolean value.

QMS calls the Lua script once for each suggestion that the TypeAhead action returns. It passes the suggestion to the `prefix` argument of the `typeahead_filter` function. The following script is a very simple example, which filters out the suggestion gold, if it returns from QMS:

    function typeahead_filter (prefix)
       if prefix == "gold" then
          return false
       end
       return true
    end

When you have a script configured, the TypeAhead action returns only suggestions for which the `typeahead_filter` function returns `True`. In the example above, the suggestion gold returns `False`, so QMS does not show it in the response for the TypeAhead action.

You can use the Knowledge Discovery Lua libraries in your Lua scripts. For more information about the available functions and methods, see Lua Functions and Methods Reference.

To configure QMS to use a Lua script for filtering

1. Open the QMS configuration file in a text editor.

2. Find the `[TypeAhead]` configuration section, or create one if it does not exist.

3. Set the Script parameter to the name of the script file that you want to use. For example:

       [TypeAhead]
       Script=filter_script.lua

4. Save and close the QMS configuration file. Restart QMS for your changes to take effect.

Copyright 2025 Open Text
Version 25.3 | Last updated July 2025

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Product: Knowledge Discovery Query Manipulation Server 25.3

Topic Title: Filter Results