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 <div class="section" id="whoosh-1-x-release-notes">
<h1>Whoosh 1.x release notes<a class="headerlink" href="#whoosh-1-x-release-notes" title="Permalink to this headline">¶</a></h1>
<div class="section" id="whoosh-1-8-3">
<h2>Whoosh 1.8.3<a class="headerlink" href="#whoosh-1-8-3" title="Permalink to this headline">¶</a></h2>
Whoosh 1.8.3 contains important bugfixes and new functionality. Thanks to all
the mailing list and BitBucket users who helped with the fixes!
Fixed a bad <tt class="docutils literal">Collector</tt> bug where the docset of a Results object did not match
the actual results.
You can now pass a sequence of objects to a keyword argument in <tt class="docutils literal">add_document</tt>
and <tt class="docutils literal">update_document</tt> (currently this will not work for unique fields in
<tt class="docutils literal">update_document</tt>). This is useful for non-text fields such as <tt class="docutils literal">DATETIME</tt>
and <tt class="docutils literal">NUMERIC</tt>, allowing you to index multiple dates/numbers for a document:
<div class="highlight-python"><div class="highlight"><pre>writer.add_document(shoe=u&quot;Saucony Kinvara&quot;, sizes=[10.0, 9.5, 12])
</pre></div>
</div>
This version reverts to using the CDB hash function for hash files instead of
Python&#8217;s <tt class="docutils literal">hash()</tt> because the latter is not meant to be stored externally.
This change maintains backwards compatibility with old files.
The <tt class="docutils literal">Searcher.search</tt> method now takes a <tt class="docutils literal">mask</tt> keyword argument. This is
the opposite of the <tt class="docutils literal">filter</tt> argument. Where the <tt class="docutils literal">filter</tt> specifies the
set of documents that can appear in the results, the <tt class="docutils literal">mask</tt> specifies a
set of documents that must not appear in the results.
Fixed performance problems in <tt class="docutils literal">Searcher.more_like</tt>. This method now also
takes a <tt class="docutils literal">filter</tt> keyword argument like <tt class="docutils literal">Searcher.search</tt>.
Improved documentation.
</div>
<div class="section" id="whoosh-1-8-2">
<h2>Whoosh 1.8.2<a class="headerlink" href="#whoosh-1-8-2" title="Permalink to this headline">¶</a></h2>
Whoosh 1.8.2 fixes some bugs, including a mistyped signature in
Searcher.more_like and a bad bug in Collector that could screw up the
ordering of results given certain parameters.
</div>
<div class="section" id="whoosh-1-8-1">
<h2>Whoosh 1.8.1<a class="headerlink" href="#whoosh-1-8-1" title="Permalink to this headline">¶</a></h2>
Whoosh 1.8.1 includes a few recent bugfixes/improvements:
<ul class="simple">
<li>ListMatcher.skip_to_quality() wasn&#8217;t returning an integer, resulting
in a &#8220;None + int&#8221; error.</li>
<li>Fixed locking and memcache sync bugs in the Google App Engine storage
object.</li>
<li>MultifieldPlugin wasn&#8217;t working correctly with groups.<ul>
<li>The binary matcher trees of Or and And are now generated using a
Huffman-like algorithm instead perfectly balanced. This gives a
noticeable speed improvement because less information has to be passed
up/down the tree.</li>
</ul>
</li>
</ul>
</div>
<div class="section" id="whoosh-1-8">
<h2>Whoosh 1.8<a class="headerlink" href="#whoosh-1-8" title="Permalink to this headline">¶</a></h2>
This release relicensed the Whoosh source code under the Simplified BSD (A.K.A.
&#8220;two-clause&#8221; or &#8220;FreeBSD&#8221;) license. See LICENSE.txt for more information.
</div>
<div class="section" id="whoosh-1-7-7">
<h2>Whoosh 1.7.7<a class="headerlink" href="#whoosh-1-7-7" title="Permalink to this headline">¶</a></h2>
Setting a TEXT field to store term vectors is now much easier. Instead of
having to pass an instantiated whoosh.formats.Format object to the vector=
keyword argument, you can pass True to automatically use the same format and
analyzer as the inverted index. Alternatively, you can pass a Format subclass
and Whoosh will instantiate it for you.
For example, to store term vectors using the same settings as the inverted
index (Positions format and StandardAnalyzer):
<div class="highlight-python"><div class="highlight"><pre>from whoosh.fields import Schema, TEXT

schema = Schema(content=TEXT(vector=Frequency))
</pre></div>
</div>
Note that currently the only place term vectors are used in Whoosh is keyword
extraction/more like this, but they can be useful for expert users with custom
code.
Added <a class="reference internal" href="../api/searching.html#whoosh.searching.Searcher.more_like" title="whoosh.searching.Searcher.more_like"><tt class="xref py py-meth docutils literal">whoosh.searching.Searcher.more_like()</tt></a> and
<a class="reference internal" href="../api/searching.html#whoosh.searching.Hit.more_like_this" title="whoosh.searching.Hit.more_like_this"><tt class="xref py py-meth docutils literal">whoosh.searching.Hit.more_like_this()</tt></a> methods, as shortcuts for doing
keyword extraction yourself. Return a Results object.
&#8220;python setup.py test&#8221; works again, as long as you have nose installed.
The <tt class="xref py py-meth docutils literal">whoosh.searching.Searcher.sort_query_using()</tt> method lets you sort documents matching a given query using an arbitrary function. Note that like &#8220;complex&#8221; searching with the Sorter object, this can be slow on large multi-segment indexes.
</div>
<div class="section" id="whoosh-1-7">
<h2>Whoosh 1.7<a class="headerlink" href="#whoosh-1-7" title="Permalink to this headline">¶</a></h2>
You can once again perform complex sorting of search results (that is, a sort
with some fields ascending and some fields descending).
You can still use the <tt class="docutils literal">sortedby</tt> keyword argument to
<a class="reference internal" href="../api/searching.html#whoosh.searching.Searcher.search" title="whoosh.searching.Searcher.search"><tt class="xref py py-meth docutils literal">whoosh.searching.Searcher.search()</tt></a> to do a simple sort (where all fields
are sorted in the same direction), or you can use the new
<tt class="xref py py-class docutils literal">Sorter</tt> class to do a simple or complex sort:
<div class="highlight-python"><div class="highlight"><pre>searcher = myindex.searcher()
sorter = searcher.sorter()
# Sort first by the group field, ascending
sorter.add_field(&quot;group&quot;)
# Then by the price field, descending
sorter.add_field(&quot;price&quot;, reverse=True)
# Get the Results
results = sorter.sort_query(myquery)
</pre></div>
</div>
See the documentation for the <tt class="xref py py-class docutils literal">Sorter</tt> class for more
information. Bear in mind that complex sorts will be much slower on large
indexes because they can&#8217;t use the per-segment field caches.
You can now get highlighted snippets for a hit automatically using
<a class="reference internal" href="../api/searching.html#whoosh.searching.Hit.highlights" title="whoosh.searching.Hit.highlights"><tt class="xref py py-meth docutils literal">whoosh.searching.Hit.highlights()</tt></a>:
<div class="highlight-python"><div class="highlight"><pre>results = searcher.search(myquery, limit=20)
for hit in results:
 print hit[&quot;title&quot;]
 print hit.highlights(&quot;content&quot;)
</pre></div>
</div>
See <a class="reference internal" href="../api/searching.html#whoosh.searching.Hit.highlights" title="whoosh.searching.Hit.highlights"><tt class="xref py py-meth docutils literal">whoosh.searching.Hit.highlights()</tt></a> for more information.
Added the ability to filter search results so that only hits in a Results
set, a set of docnums, or matching a query are returned. The filter is
cached on the searcher.
<blockquote>
<div># Search within previous results
newresults = searcher.search(newquery, filter=oldresults)
# Search within the &#8220;basics&#8221; chapter
results = searcher.search(userquery, filter=query.Term(&#8220;chapter&#8221;, &#8220;basics&#8221;))
</div></blockquote>
You can now specify a time limit for a search. If the search does not finish
in the given time, a <a class="reference internal" href="../api/searching.html#whoosh.searching.TimeLimit" title="whoosh.searching.TimeLimit"><tt class="xref py py-class docutils literal">whoosh.searching.TimeLimit</tt></a> exception is raised,
but you can still retrieve the partial results from the collector. See the
<tt class="docutils literal">timelimit</tt> and <tt class="docutils literal">greedy</tt> arguments in the
<tt class="xref py py-class docutils literal">whoosh.searching.Collector</tt> documentation.
Added back the ability to set <a class="reference internal" href="../api/analysis.html#whoosh.analysis.StemFilter" title="whoosh.analysis.StemFilter"><tt class="xref py py-class docutils literal">whoosh.analysis.StemFilter</tt></a> to use an
unlimited cache. This is useful for one-shot batch indexing (see
<a class="reference internal" href="../batch.html">Tips for speeding up batch indexing</a>).
The <tt class="docutils literal">normalize()</tt> method of the <tt class="docutils literal">And</tt> and <tt class="docutils literal">Or</tt> queries now merges
overlapping range queries for more efficient queries.
Query objects now have <tt class="docutils literal">__hash__</tt> methods allowing them to be used as
dictionary keys.
The API of the highlight module has changed slightly. Most of the functions
in the module have been converted to classes. However, most old code should
still work. The <tt class="docutils literal">NullFragmeter</tt> is now called <tt class="docutils literal">WholeFragmenter</tt>, but the
old name is still available as an alias.
Fixed MultiPool so it won&#8217;t fill up the temp directory with job files.
Fixed a bug where Phrase query objects did not use their boost factor.
Fixed a bug where a fieldname after an open parenthesis wasn&#8217;t parsed
correctly. The change alters the semantics of certain parsing &#8220;corner cases&#8221;
(such as <tt class="docutils literal">a:b:c:d</tt>).
</div>
<div class="section" id="whoosh-1-6">
<h2>Whoosh 1.6<a class="headerlink" href="#whoosh-1-6" title="Permalink to this headline">¶</a></h2>
The <tt class="docutils literal">whoosh.writing.BatchWriter</tt> class is now called
<a class="reference internal" href="../api/writing.html#whoosh.writing.BufferedWriter" title="whoosh.writing.BufferedWriter"><tt class="xref py py-class docutils literal">whoosh.writing.BufferedWriter</tt></a>. It is similar to the old <tt class="docutils literal">BatchWriter</tt>
class but allows you to search and update the buffered documents as well as the
documents that have been flushed to disk:
<div class="highlight-python"><div class="highlight"><pre>writer = writing.BufferedWriter(myindex)

# You can update (replace) documents in RAM without having to commit them
# to disk
writer.add_document(path=&quot;/a&quot;, text=&quot;Hi there&quot;)
writer.update_document(path=&quot;/a&quot;, text=&quot;Hello there&quot;)

# Search committed and uncommited documents by getting a searcher from the
# writer instead of the index
searcher = writer.searcher()
</pre></div>
</div>
(BatchWriter is still available as an alias for backwards compatibility.)
The <a class="reference internal" href="../api/qparser.html#whoosh.qparser.QueryParser" title="whoosh.qparser.QueryParser"><tt class="xref py py-class docutils literal">whoosh.qparser.QueryParser</tt></a> initialization method now requires a
schema as the second argument. Previously the default was to create a
<tt class="docutils literal">QueryParser</tt> without a schema, which was confusing:
<div class="highlight-python"><div class="highlight"><pre>qp = qparser.QueryParser(&quot;content&quot;, myindex.schema)
</pre></div>
</div>
The <a class="reference internal" href="../api/searching.html#whoosh.searching.Searcher.search" title="whoosh.searching.Searcher.search"><tt class="xref py py-meth docutils literal">whoosh.searching.Searcher.search()</tt></a> method now takes a <tt class="docutils literal">scored</tt>
keyword. If you search with <tt class="docutils literal">scored=False</tt>, the results will be in &#8220;natural&#8221;
order (the order the documents were added to the index). This is useful when
you don&#8217;t need scored results but want the convenience of the Results object.
Added the <a class="reference internal" href="../api/qparser.html#whoosh.qparser.GtLtPlugin" title="whoosh.qparser.GtLtPlugin"><tt class="xref py py-class docutils literal">whoosh.qparser.GtLtPlugin</tt></a> parser plugin to allow greater
than/less as an alternative syntax for ranges:
<div class="highlight-python"><pre>count:&gt;100 tag:&lt;=zebra date:&gt;='29 march 2001'</pre>
</div>
Added the ability to define schemas declaratively, similar to Django models:
<div class="highlight-python"><div class="highlight"><pre>from whoosh import index
from whoosh.fields import SchemaClass, ID, KEYWORD, STORED, TEXT

class MySchema(SchemaClass):
 uuid = ID(stored=True, unique=True)
 path = STORED
 tags = KEYWORD(stored=True)
 content = TEXT

index.create_in(&quot;indexdir&quot;, MySchema)
</pre></div>
</div>
Whoosh 1.6.2: Added <tt class="xref py py-class docutils literal">whoosh.searching.TermTrackingCollector</tt> which tracks
which part of the query matched which documents in the final results.
Replaced the unbounded cache in <a class="reference internal" href="../api/analysis.html#whoosh.analysis.StemFilter" title="whoosh.analysis.StemFilter"><tt class="xref py py-class docutils literal">whoosh.analysis.StemFilter</tt></a> with a
bounded LRU (least recently used) cache. This will make stemming analysis
slightly slower but prevent it from eating up too much memory over time.
Added a simple <tt class="xref py py-class docutils literal">whoosh.analysis.PyStemmerFilter</tt> that works when the
py-stemmer library is installed:
<div class="highlight-python"><div class="highlight"><pre>ana = RegexTokenizer() | PyStemmerFilter(&quot;spanish&quot;)
</pre></div>
</div>
The estimation of memory usage for the <tt class="docutils literal">limitmb</tt> keyword argument to
<tt class="docutils literal">FileIndex.writer()</tt> is more accurate, which should help keep memory usage
memory usage by the sorting pool closer to the limit.
The <tt class="docutils literal">whoosh.ramdb</tt> package was removed and replaced with a single
<tt class="docutils literal">whoosh.ramindex</tt> module.
Miscellaneous bug fixes.
</div>
<div class="section" id="whoosh-1-5">
<h2>Whoosh 1.5<a class="headerlink" href="#whoosh-1-5" title="Permalink to this headline">¶</a></h2>
<div class="admonition note">
Note
Whoosh 1.5 is incompatible with previous indexes. You must recreate
existing indexes with Whoosh 1.5.
</div>
Fixed a bug where postings were not portable across different endian platforms.
New generalized field cache system, using per-reader caches, for much faster
sorting and faceting of search results, as well as much faster multi-term (e.g.
prefix and wildcard) and range queries, especially for large indexes and/or
indexes with multiple segments.
Changed the faceting API. See <a class="reference internal" href="../facets.html">Sorting and faceting</a>.
Faster storage and retrieval of posting values.
Added per-field <tt class="docutils literal">multitoken_query</tt> attribute to control how the query parser
deals with a &#8220;term&#8221; that when analyzed generates multiple tokens. The default
value is <cite>&#8220;first&#8221;</cite> which throws away all but the first token (the previous
behavior). Other possible values are <cite>&#8220;and&#8221;</cite>, <cite>&#8220;or&#8221;</cite>, or <cite>&#8220;phrase&#8221;</cite>.
Added <a class="reference internal" href="../api/analysis.html#whoosh.analysis.DoubleMetaphoneFilter" title="whoosh.analysis.DoubleMetaphoneFilter"><tt class="xref py py-class docutils literal">whoosh.analysis.DoubleMetaphoneFilter</tt></a>,
<a class="reference internal" href="../api/analysis.html#whoosh.analysis.SubstitutionFilter" title="whoosh.analysis.SubstitutionFilter"><tt class="xref py py-class docutils literal">whoosh.analysis.SubstitutionFilter</tt></a>, and
<a class="reference internal" href="../api/analysis.html#whoosh.analysis.ShingleFilter" title="whoosh.analysis.ShingleFilter"><tt class="xref py py-class docutils literal">whoosh.analysis.ShingleFilter</tt></a>.
Added <a class="reference internal" href="../api/qparser.html#whoosh.qparser.CopyFieldPlugin" title="whoosh.qparser.CopyFieldPlugin"><tt class="xref py py-class docutils literal">whoosh.qparser.CopyFieldPlugin</tt></a>.
Added <a class="reference internal" href="../api/query.html#whoosh.query.Otherwise" title="whoosh.query.Otherwise"><tt class="xref py py-class docutils literal">whoosh.query.Otherwise</tt></a>.
Generalized parsing of operators (such as OR, AND, NOT, etc.) in the query
parser to make it easier to add new operators. In intend to add a better API
for this in a future release.
Switched NUMERIC and DATETIME fields to use more compact on-disk
representations of numbers.
Fixed a bug in the porter2 stemmer when stemming the string <cite>&#8220;y&#8221;</cite>.
Added methods to <a class="reference internal" href="../api/searching.html#whoosh.searching.Hit" title="whoosh.searching.Hit"><tt class="xref py py-class docutils literal">whoosh.searching.Hit</tt></a> to make it more like a <cite>dict</cite>.
Short posting lists (by default, single postings) are inline in the term file
instead of written to the posting file for faster retrieval and a small saving
in disk space.
</div>
<div class="section" id="whoosh-1-3">
<h2>Whoosh 1.3<a class="headerlink" href="#whoosh-1-3" title="Permalink to this headline">¶</a></h2>
Whoosh 1.3 adds a more efficient DATETIME field based on the new tiered NUMERIC
field, and the DateParserPlugin. See <a class="reference internal" href="../dates.html">Indexing and parsing dates/times</a>.
</div>
<div class="section" id="whoosh-1-2">
<h2>Whoosh 1.2<a class="headerlink" href="#whoosh-1-2" title="Permalink to this headline">¶</a></h2>
Whoosh 1.2 adds tiered indexing for NUMERIC fields, resulting in much faster
range queries on numeric fields.
</div>
<div class="section" id="whoosh-1-0">
<h2>Whoosh 1.0<a class="headerlink" href="#whoosh-1-0" title="Permalink to this headline">¶</a></h2>
Whoosh 1.0 is a major milestone release with vastly improved performance and
several useful new features.
The index format of this version is not compatibile with indexes created by
previous versions of Whoosh. You will need to reindex your data to use this
version.
Orders of magnitude faster searches for common terms. Whoosh now uses
optimizations similar to those in Xapian to skip reading low-scoring postings.
Faster indexing and ability to use multiple processors (via <tt class="docutils literal">multiprocessing</tt>
module) to speed up indexing.
Flexible Schema: you can now add and remove fields in an index with the
<a class="reference internal" href="../api/writing.html#whoosh.writing.IndexWriter.add_field" title="whoosh.writing.IndexWriter.add_field"><tt class="xref py py-meth docutils literal">whoosh.writing.IndexWriter.add_field()</tt></a> and
<a class="reference internal" href="../api/writing.html#whoosh.writing.IndexWriter.remove_field" title="whoosh.writing.IndexWriter.remove_field"><tt class="xref py py-meth docutils literal">whoosh.writing.IndexWriter.remove_field()</tt></a> methods.
New hand-written query parser based on plug-ins. Less brittle, more robust,
more flexible, and easier to fix/improve than the old pyparsing-based parser.
On-disk formats now use 64-bit disk pointers allowing files larger than 4 GB.
New <tt class="xref py py-class docutils literal">whoosh.searching.Facets</tt> class efficiently sorts results into
facets based on any criteria that can be expressed as queries, for example
tags or price ranges.
New <tt class="xref py py-class docutils literal">whoosh.writing.BatchWriter</tt> class automatically batches up
individual <tt class="docutils literal">add_document</tt> and/or <tt class="docutils literal">delete_document</tt> calls until a certain
number of calls or a certain amount of time passes, then commits them all at
once.
New <a class="reference internal" href="../api/analysis.html#whoosh.analysis.BiWordFilter" title="whoosh.analysis.BiWordFilter"><tt class="xref py py-class docutils literal">whoosh.analysis.BiWordFilter</tt></a> lets you create bi-word indexed
fields a possible alternative to phrase searching.
Fixed bug where files could be deleted before a reader could open them in
threaded situations.
New <a class="reference internal" href="../api/analysis.html#whoosh.analysis.NgramFilter" title="whoosh.analysis.NgramFilter"><tt class="xref py py-class docutils literal">whoosh.analysis.NgramFilter</tt></a> filter,
<a class="reference internal" href="../api/analysis.html#whoosh.analysis.NgramWordAnalyzer" title="whoosh.analysis.NgramWordAnalyzer"><tt class="xref py py-class docutils literal">whoosh.analysis.NgramWordAnalyzer</tt></a> analyzer, and
<a class="reference internal" href="../api/fields.html#whoosh.fields.NGRAMWORDS" title="whoosh.fields.NGRAMWORDS"><tt class="xref py py-class docutils literal">whoosh.fields.NGRAMWORDS</tt></a> field type allow producing n-grams from
tokenized text.
Errors in query parsing now raise a specific <tt class="docutils literal">whoosh.qparse.QueryParserError</tt>
exception instead of a generic exception.
Previously, the query string <tt class="docutils literal">*</tt> was optimized to a
<a class="reference internal" href="../api/query.html#whoosh.query.Every" title="whoosh.query.Every"><tt class="xref py py-class docutils literal">whoosh.query.Every</tt></a> query which matched every document. Now the
<tt class="docutils literal">Every</tt> query only matches documents that actually have an indexed term from
the given field, to better match the intuitive sense of what a query string like
<tt class="docutils literal">tag:*</tt> should do.
New <a class="reference internal" href="../api/searching.html#whoosh.searching.Searcher.key_terms_from_text" title="whoosh.searching.Searcher.key_terms_from_text"><tt class="xref py py-meth docutils literal">whoosh.searching.Searcher.key_terms_from_text()</tt></a> method lets you
extract key words from arbitrary text instead of documents in the index.
Previously the <a class="reference internal" href="../api/searching.html#whoosh.searching.Searcher.key_terms" title="whoosh.searching.Searcher.key_terms"><tt class="xref py py-meth docutils literal">whoosh.searching.Searcher.key_terms()</tt></a> and
<a class="reference internal" href="../api/searching.html#whoosh.searching.Results.key_terms" title="whoosh.searching.Results.key_terms"><tt class="xref py py-meth docutils literal">whoosh.searching.Results.key_terms()</tt></a> methods required that the given
field store term vectors. They now also work if the given field is stored
instead. They will analyze the stored string into a term vector on-the-fly.
The field must still be indexed.
</div>
<div class="section" id="user-api-changes">
<h2>User API changes<a class="headerlink" href="#user-api-changes" title="Permalink to this headline">¶</a></h2>
The default for the <tt class="docutils literal">limit</tt> keyword argument to
<a class="reference internal" href="../api/searching.html#whoosh.searching.Searcher.search" title="whoosh.searching.Searcher.search"><tt class="xref py py-meth docutils literal">whoosh.searching.Searcher.search()</tt></a> is now <tt class="docutils literal">10</tt>. To return all results
in a single <tt class="docutils literal">Results</tt> object, use <tt class="docutils literal">limit=None</tt>.
The <tt class="docutils literal">Index</tt> object no longer represents a snapshot of the index at the time
the object was instantiated. Instead it always represents the index in the
abstract. <tt class="docutils literal">Searcher</tt> and <tt class="docutils literal">IndexReader</tt> objects obtained from the
<tt class="docutils literal">Index</tt> object still represent the index as it was at the time they were
created.
Because the <tt class="docutils literal">Index</tt> object no longer represents the index at a specific
version, several methods such as <tt class="docutils literal">up_to_date</tt> and <tt class="docutils literal">refresh</tt> were removed
from its interface. The Searcher object now has
<tt class="xref py py-meth docutils literal">last_modified()</tt>,
<a class="reference internal" href="../api/searching.html#whoosh.searching.Searcher.up_to_date" title="whoosh.searching.Searcher.up_to_date"><tt class="xref py py-meth docutils literal">up_to_date()</tt></a>, and
<a class="reference internal" href="../api/searching.html#whoosh.searching.Searcher.refresh" title="whoosh.searching.Searcher.refresh"><tt class="xref py py-meth docutils literal">refresh()</tt></a> methods similar to those that used to
be on <tt class="docutils literal">Index</tt>.
The document deletion and field add/remove methods on the <tt class="docutils literal">Index</tt> object now
create a writer behind the scenes to accomplish each call. This means they write
to the index immediately, so you don&#8217;t need to call <tt class="docutils literal">commit</tt> on the <tt class="docutils literal">Index</tt>.
Also, it will be much faster if you need to call them multiple times to create
your own writer instead:
<div class="highlight-python"><div class="highlight"><pre># Don&#39;t do this
for id in my_list_of_ids_to_delete:
 myindex.delete_by_term(&quot;id&quot;, id)
myindex.commit()

# Instead do this
writer = myindex.writer()
for id in my_list_of_ids_to_delete:
 writer.delete_by_term(&quot;id&quot;, id)
writer.commit()
</pre></div>
</div>
The <tt class="docutils literal">postlimit</tt> argument to <tt class="docutils literal">Index.writer()</tt> has been changed to
<tt class="docutils literal">postlimitmb</tt> and is now expressed in megabytes instead of bytes:
<div class="highlight-python"><div class="highlight"><pre>writer = myindex.writer(postlimitmb=128)
</pre></div>
</div>
Instead of having to import <tt class="docutils literal">whoosh.filedb.filewriting.NO_MERGE</tt> or
<tt class="docutils literal">whoosh.filedb.filewriting.OPTIMIZE</tt> to use as arguments to <tt class="docutils literal">commit()</tt>, you
can now simply do the following:
<div class="highlight-python"><div class="highlight"><pre># Do not merge segments
writer.commit(merge=False)

# or

# Merge all segments
writer.commit(optimize=True)
</pre></div>
</div>
The <tt class="docutils literal">whoosh.postings</tt> module is gone. The <tt class="docutils literal">whoosh.matching</tt> module contains
classes for posting list readers.
Whoosh no longer maps field names to numbers for internal use or writing to
disk. Any low-level method that accepted field numbers now accept field names
instead.
Custom Weighting implementations that use the <tt class="docutils literal">final()</tt> method must now
set the <tt class="docutils literal">use_final</tt> attribute to <tt class="docutils literal">True</tt>:
<div class="highlight-python"><div class="highlight"><pre>from whoosh.scoring import BM25F

class MyWeighting(BM25F):
 use_final = True

def final(searcher, docnum, score):
 return score + docnum * 10
</pre></div>
</div>
This disables the new optimizations, forcing Whoosh to score every matching
document.
<a class="reference internal" href="../api/writing.html#whoosh.writing.AsyncWriter" title="whoosh.writing.AsyncWriter"><tt class="xref py py-class docutils literal">whoosh.writing.AsyncWriter</tt></a> now takes an <a class="reference internal" href="../api/index.html#whoosh.index.Index" title="whoosh.index.Index"><tt class="xref py py-class docutils literal">whoosh.index.Index</tt></a>
object as its first argument, not a callable. Also, the keyword arguments to
pass to the index&#8217;s <tt class="docutils literal">writer()</tt> method should now be passed as a dictionary
using the <tt class="docutils literal">writerargs</tt> keyword argument.
Whoosh now stores per-document field length using an approximation rather than
exactly. For low numbers the approximation is perfectly accurate, while high
numbers will be approximated less accurately.
The <tt class="docutils literal">doc_field_length</tt> method on searchers and readers now takes a second
argument representing the default to return if the given document and field
do not have a length (i.e. the field is not scored or the field was not
provided for the given document).
The <a class="reference internal" href="../api/analysis.html#whoosh.analysis.StopFilter" title="whoosh.analysis.StopFilter"><tt class="xref py py-class docutils literal">whoosh.analysis.StopFilter</tt></a> now has a <tt class="docutils literal">maxsize</tt> argument as well
as a <tt class="docutils literal">minsize</tt> argument to its initializer. Analyzers that use the
<tt class="docutils literal">StopFilter</tt> have the <tt class="docutils literal">maxsize</tt> argument in their initializers now also.
The interface of <a class="reference internal" href="../api/writing.html#whoosh.writing.AsyncWriter" title="whoosh.writing.AsyncWriter"><tt class="xref py py-class docutils literal">whoosh.writing.AsyncWriter</tt></a> has changed.
</div>
<div class="section" id="misc">
<h2>Misc<a class="headerlink" href="#misc" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>Because the file backend now writes 64-bit disk pointers and field names
instead of numbers, the size of an index on disk will grow compared to
previous versions.</li>
<li>Unit tests should no longer leave directories and files behind.</li>
</ul>
</div>
</div>

</div>
 </div>
 </div>
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 <div class="sphinxsidebarwrapper">
 <h3><a href="../index.html">Table Of Contents</a></h3>
 <ul>
<li><a class="reference internal" href="#">Whoosh 1.x release notes</a><ul>
<li><a class="reference internal" href="#whoosh-1-8-3">Whoosh 1.8.3</a></li>
<li><a class="reference internal" href="#whoosh-1-8-2">Whoosh 1.8.2</a></li>
<li><a class="reference internal" href="#whoosh-1-8-1">Whoosh 1.8.1</a></li>
<li><a class="reference internal" href="#whoosh-1-8">Whoosh 1.8</a></li>
<li><a class="reference internal" href="#whoosh-1-7-7">Whoosh 1.7.7</a></li>
<li><a class="reference internal" href="#whoosh-1-7">Whoosh 1.7</a></li>
<li><a class="reference internal" href="#whoosh-1-6">Whoosh 1.6</a></li>
<li><a class="reference internal" href="#whoosh-1-5">Whoosh 1.5</a></li>
<li><a class="reference internal" href="#whoosh-1-3">Whoosh 1.3</a></li>
<li><a class="reference internal" href="#whoosh-1-2">Whoosh 1.2</a></li>
<li><a class="reference internal" href="#whoosh-1-0">Whoosh 1.0</a></li>
<li><a class="reference internal" href="#user-api-changes">User API changes</a></li>
<li><a class="reference internal" href="#misc">Misc</a></li>
</ul>
</li>
</ul>

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