why django haystack spelling_suggestion() is always None

Question

I need to integrate spell check mechanism in Django application. I found that Haystack has "Spelling Suggestions" method to use it. So I have installed latest dev version(2.0.0 beta) of haysatck with Django(1.4.1).

I have downloaded apache-solr-3.6.0 and configured as like in doc.

schema.xml

./manage.py build_solr_schema > solr-3.6.0/example/solr/conf/schema.xml

myapps/mysearch_index.py

from haystack import indexes

class MovieIndex(indexes.SearchIndex, indexes.Indexable):
    text = indexes.CharField(document=True,use_template=True)
    # other field definition
    suggestions = indexes.FacetCharField()

    def prepare(self, obj):
        prepared_data = super(NoteIndex, self).prepare(obj)
        prepared_data['suggestions'] = prepared_data['text']
        return prepared_data

solrconfig.xml

<searchComponent name="spellcheck" class="solr.SpellCheckComponent">
    <str name="queryAnalyzerFieldType">textSpell</str>
    <lst name="spellchecker">
        <str name="name">default</str>
        <str name="field">suggestions</str>
        <str name="spellcheckIndexDir">./spellchecker</str>
        <str name="accuracy">0.7</str>
        <str name="buildOnCommit">true</str>
    </lst>
</searchComponent>
<requestHandler name="/spell" class="solr.SearchHandler">
    <lst name="defaults">
        <str name="spellcheck.dictionary">default</str>
        <str name="spellcheck.onlyMorePopular">false</str>
        <str name="spellcheck.extendedResults">false</str>
        <str name="spellcheck.count">1</str>
    </lst>
    <arr name="last-components">
        <str>spellcheck</str>
    </arr>
</requestHandler>

settings.py

HAYSTACK_CONNECTIONS = {
  'default': {
    'ENGINE': 'haystack.backends.solr_backend.SolrEngine',
    'URL': 'http://127.0.0.1:8983/solr',
    'TIMEOUT': 60 * 5,
    'INCLUDE_SPELLING': True,
  },
}

Restart the solr search engine

cd examples/solr
java -jar start.jar

Rebuild the index

python manage.py rebuild_index
# 9905 entries indexed

Testing through django shell

In [1]: from haystack.query import SearchQuerySet
In [2]: len(SearchQuerySet())
Out[3]: 9905
In [4]: sqs = SearchQuerySet().auto_query('spider')
In [5]: suggestion = sqs.spelling_suggestion()
In [6]: print suggestion
None
In [7]:

I have gone though several bolgs and forum and tried of lot of settings, But spelling_suggestion is always None.

Can anyone help me?

Thanks for reading this post

Rohan Rohan · Accepted Answer · 2013-01-11T21:02:12

You have to enable spellcheck for your default request handler in solr config. The step is mentioned in the haystack doc also that you mentioned in your question.

<requestHandler name="standard" class="solr.StandardRequestHandler" default="true">
    <arr name="last-components">
        <str>spellcheck</str>
    </arr>
</requestHandler>

If this is not done then this should fix it. If you still face problem or this step is also done then I think you should try querying solr directly in browser to check if suggestions are working there as this will ensure that your solr is setup properly.

Please let me know if you still face problem and I'll try it personally.

why django haystack spelling_suggestion() is always None

1 Answers