Suggest don't work like spellcheck

[xing hu <hu...@gmail.com>]

Hi All:
    I'm trying the Suggest Component to provide auto-suggest. But i find a
problem when use it.
First i use the spellcheck component,it's support check the spell and
return the right spell, so i think Suggest Component can also return the
right spell term.
but the Suggest Component seems don't return the right spell. Anybody know
why?
this is my solr-config.xml and search results.

spellcheck component:
    <searchComponent name="spellcheck" class="solr.SpellCheckComponent">
        <!--
        <str name="queryAnalyzerFieldType">textSpell</str>
        -->
        <lst name="spellchecker">
            <!--
            <str name="classname">solr.IndexBaseSpellChecker</str>
            -->
            <str name="name">default</str>
            <str name="field">spu_name</str>
            <str name="spellcheckIndexDir">spellchecker</str>
            <str name="buildOnCommit">true</str>
        </lst>
    </searchComponent>

    <requestHandler name="/spell" class="solr.SearchHandler" startup="lazy">
        <lst name="defaults">
            <str name="spellcheck.onlyMorePopular">false</str>
            <str name="spellcheck.extendedResults">false</str>
            <str name="spellcheck.count">2</str>
            <str name="spellcheck">true</str>
        </lst>
        <arr name="last-components">
        <str>spellcheck</str>
        </arr>
    </requestHandler>

http://localhost:8080/solr/spell?spellcheck.q=iped&rows=0&indent=on&q=*:*
search result :
<response>
<lst name="responseHeader">
<int name="status">0</int>
<int name="QTime">30</int>
</lst>
<result name="response" numFound="4890" start="0"/>
<lst name="spellcheck">
<lst name="suggestions">
<lst name="iped">
<int name="numFound">2</int>
<int name="startOffset">0</int>
<int name="endOffset">4</int>
<arr name="suggestion">
<str>ipad</str>
<str>ipod</str>
</arr>
</lst>
</lst>
</lst>
</response>

Suggest Component:
solr-config.xml:
<searchComponent name = "suggest" class="solr.SpellCheckComponent">
        <lst name="spellchecker">
            <str name="name">suggest</str>
            <str
name="classname">org.apache.solr.spelling.suggest.Suggester</str>
            <str
name="lookupImpl">org.apache.solr.spelling.suggest.fst.FSTLookup</str>
            <str name="field">spu_name</str>
            <float name="threshold">0.005</float>
            <str name="spellcheckIndexDir">spellchecker</str>
            <str name="buildOnCommit">true</str>
        </lst>
    </searchComponent>

    <requestHandler class="solr.SearchHandler"
name="/suggest">
    <lst name="defaults">
      <str name="spellcheck">true</str>
      <str name="spellcheck.dictionary">suggest</str>
      <str name="spellcheck.onlyMorePopular">false</str>
      <str name="spellcheck.count">8</str>
      <str name="spellcheck.collate">true</str>
    </lst>
    <arr name="components">
      <str>suggest</str>
    </arr>
  </requestHandler>

curl "http://localhost:8080/solr/suggest?q=ipe"
search result:
<response>
<lst name="responseHeader">
<int name="status">0</int>
<int name="QTime">0</int>
</lst>
<lst name="spellcheck">
<lst name="suggestions"/>
</lst>
</response>

How to take the Suggest's response like spellcheck? any suggestion?
--
iamxhu
GTalk:huxing1985@gmail.com
my blog:www.colorfuldays.org