Drupal 6.x strings and integers

The Problem

Drupal 6.x ships Solr config files with a known bug: numeric and floating-point values are wrapped in <str> tags instead of <int> and <float> tags. Solr expects the correct XML types and will throw errors or behave unpredictably when it gets strings where it expects numbers.

What Is Wrong

In solrconfig_extra.xml (and possibly other Drupal config files), you will find entries like this:

<!-- WRONG: integers and floats wrapped as strings -->
<str name="accuracy">0.5</str>
<str name="maxEdits">2</str>
<str name="minPrefix">1</str>
<str name="maxInspections">5</str>
<str name="minQueryLength">4</str>
<str name="maxQueryFrequency">0.01</str>
<str name="thresholdTokenFrequency">.01</str>

These should use the correct XML types based on their values:

<!-- CORRECT: proper types for each value -->
<float name="accuracy">0.5</float>
<int name="maxEdits">2</int>
<int name="minPrefix">1</int>
<int name="maxInspections">5</int>
<int name="minQueryLength">4</int>
<float name="maxQueryFrequency">0.01</float>
<float name="thresholdTokenFrequency">.01</float>

How to Fix It

1. Open your Opensolr Index Control Panel
2. Go to the Config Files Editor
3. Select solrconfig_extra.xml
4. Find all <str> tags that contain numeric values
5. Change <str> to <int> for whole numbers and <float> for decimal numbers
6. Save and Reload your Opensolr Index

Also check other Drupal config files (solrconfig.xml, schema_extra_types.xml) for the same issue — this bug may appear in multiple places across different Drupal Solr versions.

Quick Reference

Need help fixing Drupal config files? Reach out to us at support@opensolr.com — we can correct these issues for you instantly.