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<h2>
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<a name="change-log" class="anchor" href="#change-log"><span class="octicon octicon-link"></span></a>Change log</h2>
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<h3>
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<a name="423" class="anchor" href="#423"><span class="octicon octicon-link"></span></a>4.2.3</h3>
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<ul>
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<li>Fixed <code>attr_accessible?</code> error introduced in 4.2.2 (<a href="https://github.com/mceachen/closure_tree/issues/66">issue 66</a>).</li>
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<li>Switched to use new WithAdvisoryLock::DatabaseAdapterSupport (in v0.0.9) to add Postgis support</li>
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</ul><h3>
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<a name="422" class="anchor" href="#422"><span class="octicon octicon-link"></span></a>4.2.2</h3>
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<ul>
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<li>Support attr_accessible and strong_attributes even if you're on Rails 4</li>
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</ul><h3>
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<a name="421" class="anchor" href="#421"><span class="octicon octicon-link"></span></a>4.2.1</h3>
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<ul>
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<li>Deleting from NumericDeterministicOrdering doesn't create sort order gaps anymore.</li>
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</ul><h3>
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<a name="420" class="anchor" href="#420"><span class="octicon octicon-link"></span></a>4.2.0</h3>
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<ul>
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<li>Added <code>with_ancestor(*ancestors)</code>. Thanks for the idea, <a href="https://github.com/mgornick">Matt</a>!</li>
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<li>Applied <a href="https://github.com/leonelgalan">Leonel Galan</a>'s fix for Strong Attribute support</li>
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<li>
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<code>find_or_create_by</code> now uses passed-in attributes as both selection and creation criteria.
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Thanks for the help, <a href="https://github.com/juddblair">Judd Blair</a>!
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<strong>Please note that this changes prior behavior—test your code with this new version!</strong>
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</li>
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<li>
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<code>ct_advisory_lock</code> was moved into the <code>_ct</code> support class, to reduce model method pollution</li>
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<li>Moved a bunch of code into more focused piles of module mixins</li>
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</ul><h3>
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<a name="410" class="anchor" href="#410"><span class="octicon octicon-link"></span></a>4.1.0</h3>
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<ul>
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<li>Added support for Rails 4.0.0.rc1 and Ruby 2.0.0 (while maintaining backward compatibility with Rails 3, BOOYA)</li>
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<li>Added <code>#to_dot_digraph</code>, suitable for Graphviz rendering</li>
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</ul><h3>
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<a name="401" class="anchor" href="#401"><span class="octicon octicon-link"></span></a>4.0.1</h3>
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<ul>
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<li><p>Numeric, deterministically ordered siblings will always be <a href="previously,%20the%20sort%20order%20might%20use%20negative%20values,%20which%20broke%20the%20preordering">0..#{self_and_siblings.count}</a>.
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Resolves <a href="https://github.com/mceachen/closure_tree/issues/49">issue 49</a>. Thanks for the help,
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<a href="https://github.com/leonelgalan">Leonel Galan</a>, <a href="https://github.com/elhoyos">Juan Hoyos</a>, and
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<a href="https://github.com/elfassy">Michael Elfassy</a>!</p></li>
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<li><p>The <code>order</code> option can be a symbol now. Resolves <a href="https://github.com/mceachen/closure_tree/issues/46">issue 46</a>.</p></li>
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</ul><h3>
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<a name="400" class="anchor" href="#400"><span class="octicon octicon-link"></span></a>4.0.0</h3>
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<ul>
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<li>
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<p>Moved all of closure_tree's implementation-detail methods into a <code>ClosureTree::Support</code>
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instance, which removes almost all of the namespace pollution in your models that wasn't
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for normal consumption. If you were using any of these methods, they're now available through
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the "_ct" class and instance member.</p>
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<p><em>This change may break consumers</em>, so I incremented the major version number, even though no new
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functionality was released.</p>
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</li>
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</ul><h3>
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<a name="3102" class="anchor" href="#3102"><span class="octicon octicon-link"></span></a>3.10.2</h3>
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<ul>
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<li><p>Prevent faulty SQL statement when <code>#siblings</code> is called on an unsaved records.
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Resolves <a href="https://github.com/mceachen/closure_tree/pull/52">issue 52</a>. Perfect pull
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request by <a href="https://github.com/garygreyling">Gary Greyling</a>.</p></li>
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<li><p>The <code>.roots</code> class method now correctly respects the <code>:order</code> option.
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Resolves <a href="https://github.com/mceachen/closure_tree/issues/53">issue 53</a>.
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Thanks for finding this, <a href="https://github.com/brendon">Brendon Muir</a>!</p></li>
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</ul><h3>
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<a name="3101" class="anchor" href="#3101"><span class="octicon octicon-link"></span></a>3.10.1</h3>
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<ul>
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<li><p>Multipart constant names like "Admin::PageHierarchy" are now supported.
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Resolves <a href="https://github.com/mceachen/closure_tree/issues/47">issue 47</a>.
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Thanks for the perfect pull request, <a href="https://github.com/fd">Simon Menke</a>!</p></li>
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<li><p>Committing transactions involving large numbers of hierarchy model classes was very slow due
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to hash collisions in the hierarchy class. A better hash implementation addressed
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<a href="https://github.com/mceachen/closure_tree/issues/48">issue 48</a>.
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Thanks, <a href="https://github.com/jturkel">Joel Turkel</a>!</p></li>
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</ul><h3>
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<a name="3100" class="anchor" href="#3100"><span class="octicon octicon-link"></span></a>3.10.0</h3>
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<ul>
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<li>Added <code>#roots_and_descendants_preordered</code>.
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Thanks for the suggestion, <a href="https://github.com/leonelgalan">Leonel Galan</a>!</li>
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</ul><h3>
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<a name="390" class="anchor" href="#390"><span class="octicon octicon-link"></span></a>3.9.0</h3>
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<ul>
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<li>Added <code>.child_ids</code>.</li>
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<li>Removed <code>dependent =&gt; destroy</code> on the descendant_hierarchy and ancestor_hierarchy collections
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(they were a mistake).</li>
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<li>Clarified documentation for creation and child associations.
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Because <code>Tag.create!(:parent =&gt; ...)</code> requires a <code>.reload</code>, I removed it as an example.</li>
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</ul><p>All three of these improvements were suggested by Andrew Bromwich. Thanks!</p>
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<h3>
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<a name="382" class="anchor" href="#382"><span class="octicon octicon-link"></span></a>3.8.2</h3>
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<ul>
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<li>find_by_path uses 1 SELECT now. BOOM.</li>
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</ul><h3>
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<a name="381" class="anchor" href="#381"><span class="octicon octicon-link"></span></a>3.8.1</h3>
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<ul>
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<li>Double-check locking for find_or_create_by_path</li>
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</ul><h3>
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<a name="380" class="anchor" href="#380"><span class="octicon octicon-link"></span></a>3.8.0</h3>
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<ul>
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<li>Support for preordered descendants. This requires a numeric sort order column.
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Resolves <a href="https://github.com/mceachen/closure_tree/issues/38">feature request 38</a>.</li>
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<li>Moved modules from <code>acts_as_tree</code> into separate files</li>
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</ul><h3>
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<a name="373" class="anchor" href="#373"><span class="octicon octicon-link"></span></a>3.7.3</h3>
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<p>Due to MySQL's inability to lock rows properly, I've switched to advisory_locks for
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all write paths. This will prevent deadlocks, addressing
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<a href="https://github.com/mceachen/closure_tree/issues/41">issue 41</a>.</p>
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<h3>
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<a name="372" class="anchor" href="#372"><span class="octicon octicon-link"></span></a>3.7.2</h3>
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<ul>
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<li>Support for UUID primary keys. Addresses
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<a href="https://github.com/mceachen/closure_tree/issues/40">issue 40</a>. Thanks for the pull request,
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<a href="https://github.com/calexicoz">Julien</a>!</li>
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</ul><h3>
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<a name="371" class="anchor" href="#371"><span class="octicon octicon-link"></span></a>3.7.1</h3>
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<ul>
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<li>Moved requires into ActiveSupport.on_load</li>
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<li>Added <code>require 'with_advisory_lock'</code>
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</li>
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</ul><h3>
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<a name="370" class="anchor" href="#370"><span class="octicon octicon-link"></span></a>3.7.0</h3>
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<p><strong>Thread safety!</strong></p>
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<ul>
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<li>
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<a href="https://github.com/mceachen/with_advisory_lock">Advisory locks</a> were
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integrated with the class-level <code>find_or_create_by_path</code> and <code>rebuild!</code>.</li>
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<li>Pessimistic locking is used by the instance-level <code>find_or_create_by_path</code>.</li>
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</ul><h3>
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<a name="369" class="anchor" href="#369"><span class="octicon octicon-link"></span></a>3.6.9</h3>
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<ul>
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<li>
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<a href="https://github.com/elskwid">Don Morrison</a> massaged the <a href="#nested-hashes">#hash_tree</a> query to
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be more efficient, and found a bug in <code>hash_tree</code>'s query that resulted in duplicate rows,
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wasting time on the ruby side.</li>
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</ul><h3>
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<a name="367" class="anchor" href="#367"><span class="octicon octicon-link"></span></a>3.6.7</h3>
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<ul>
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<li>Added workaround for ActiveRecord::Observer usage pre-db-creation. Addresses
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<a href="https://github.com/mceachen/closure_tree/issues/32">issue 32</a>.
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Thanks, <a href="https://github.com/elskwid">Don Morrison</a>!</li>
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</ul><h3>
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<a name="366" class="anchor" href="#366"><span class="octicon octicon-link"></span></a>3.6.6</h3>
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<ul>
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<li>Added support for Rails 4's <a href="https://github.com/rails/strong_parameters">strong parameter</a>.
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Thanks, <a href="https://github.com/bensie">James Miller</a>!</li>
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</ul><h3>
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<a name="365" class="anchor" href="#365"><span class="octicon octicon-link"></span></a>3.6.5</h3>
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<ul>
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<li>Use <code>quote_table_name</code> instead of <code>quote_column_name</code>. Addresses
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<a href="https://github.com/mceachen/closure_tree/issues/29">issue 29</a>. Thanks,
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<a href="https://github.com/vjt">Marcello Barnaba</a>!</li>
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</ul><h3>
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<a name="364" class="anchor" href="#364"><span class="octicon octicon-link"></span></a>3.6.4</h3>
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<ul>
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<li>Use <code>.pluck</code> when available for <code>.ids_from</code>. Addresses
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<a href="https://github.com/mceachen/closure_tree/issues/26">issue 26</a>. Thanks,
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<a href="https://github.com/sturgill">Chris Sturgill</a>!</li>
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</ul><h3>
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<a name="363" class="anchor" href="#363"><span class="octicon octicon-link"></span></a>3.6.3</h3>
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<ul>
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<li>Fixed <a href="https://github.com/mceachen/closure_tree/issues/24">issue 24</a>, which optimized <code>#hash_tree</code>
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for roots. Thanks, <a href="https://github.com/rewritten">Saverio Trioni</a>!</li>
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</ul><h3>
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<a name="362" class="anchor" href="#362"><span class="octicon octicon-link"></span></a>3.6.2</h3>
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<ul>
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<li>Fixed <a href="https://github.com/mceachen/closure_tree/issues/23">issue 23</a>, which added support for <code>#siblings</code>
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when sort_order wasn't specified. Thanks, <a href="https://github.com/garygreyling">Gary Greyling</a>!</li>
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</ul><h3>
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<a name="361" class="anchor" href="#361"><span class="octicon octicon-link"></span></a>3.6.1</h3>
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<ul>
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<li>Fixed <a href="https://github.com/mceachen/closure_tree/issues/20">issue 20</a>, which affected
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deterministic ordering when siblings where different STI classes. Thanks, <a href="https://github.com/edwinramirez">edwinramirez</a>!</li>
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</ul><h3>
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<a name="360" class="anchor" href="#360"><span class="octicon octicon-link"></span></a>3.6.0</h3>
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<p>Added support for:</p>
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<ul>
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<li>
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<code>:hierarchy_class_name</code> as an option</li>
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<li>ActiveRecord::Base.table_name_prefix</li>
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<li>ActiveRecord::Base.table_name_suffix</li>
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</ul><p>This addresses <a href="https://github.com/mceachen/closure_tree/issues/21">issue 21</a>. Thanks, <a href="https://github.com/juddblair">Judd Blair</a>!</p>
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<h3>
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<a name="352" class="anchor" href="#352"><span class="octicon octicon-link"></span></a>3.5.2</h3>
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<ul>
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<li>Added <code>find_all_by_generation</code>
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for <a href="https://github.com/mceachen/closure_tree/issues/17">feature request 17</a>.</li>
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</ul><h3>
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<a name="342" class="anchor" href="#342"><span class="octicon octicon-link"></span></a>3.4.2</h3>
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<ul>
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<li>Fixed <a href="https://github.com/mceachen/closure_tree/issues/18">issue 18</a>, which affected
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append_node/prepend_node ordering when the first node didn't have an explicit order_by value</li>
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</ul><h3>
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<a name="341" class="anchor" href="#341"><span class="octicon octicon-link"></span></a>3.4.1</h3>
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<ul>
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<li>Reverted .gemspec mistake that changed add_development_dependency to add_runtime_dependency</li>
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</ul><h3>
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<a name="340" class="anchor" href="#340"><span class="octicon octicon-link"></span></a>3.4.0</h3>
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<p>Fixed <a href="https://github.com/mceachen/closure_tree/issues/15">issue 15</a>:</p>
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<ul>
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<li>"parent" is now attr_accessible, which adds support for constructor-provided parents.</li>
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<li>updated readme accordingly</li>
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</ul><h3>
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<a name="332" class="anchor" href="#332"><span class="octicon octicon-link"></span></a>3.3.2</h3>
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<ul>
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<li>Merged calebphillips' patch for a more efficient leaves query</li>
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</ul><h3>
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<a name="331" class="anchor" href="#331"><span class="octicon octicon-link"></span></a>3.3.1</h3>
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<ul>
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<li>Added support for partially-unsaved hierarchies <a href="https://github.com/mceachen/closure_tree/issues/13">issue 13</a>:
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<code>
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a = Tag.new(name: "a")
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b = Tag.new(name: "b")
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a.children &lt;&lt; b
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a.save
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</code>
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</li>
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</ul><h3>
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<a name="330" class="anchor" href="#330"><span class="octicon octicon-link"></span></a>3.3.0</h3>
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<ul>
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<li>Added <a href="#nested-hashes"><code>hash_tree</code></a>.</li>
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</ul><h3>
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<a name="321" class="anchor" href="#321"><span class="octicon octicon-link"></span></a>3.2.1</h3>
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<ul>
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<li>Added <code>ancestor_ids</code>, <code>descendant_ids</code>, and <code>sibling_ids</code>
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</li>
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<li>Added example spec to solve <a href="https://github.com/mceachen/closure_tree/issues/9">issue 9</a>
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</li>
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</ul><h3>
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<a name="320" class="anchor" href="#320"><span class="octicon octicon-link"></span></a>3.2.0</h3>
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<ul>
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<li>Added support for deterministic ordering of nodes.</li>
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</ul><h3>
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<a name="310" class="anchor" href="#310"><span class="octicon octicon-link"></span></a>3.1.0</h3>
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<ul>
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<li>Switched to using <code>has_many :though</code> rather than <code>has_and_belongs_to_many</code>
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</li>
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</ul><h3>
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<a name="304" class="anchor" href="#304"><span class="octicon octicon-link"></span></a>3.0.4</h3>
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<ul>
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<li>Merged <a href="https://github.com/mceachen/closure_tree/pull/8">pull request</a> to fix <code>.siblings</code> and <code>.self_and_siblings</code>
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(Thanks, <a href="https://github.com/eljojo">eljojo</a>!)</li>
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</ul><h3>
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<a name="303" class="anchor" href="#303"><span class="octicon octicon-link"></span></a>3.0.3</h3>
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<ul>
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<li>Added support for ActiveRecord's whitelist_attributes
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(Make sure you read <a href="http://guides.rubyonrails.org/security.html">the Rails Security Guide</a>, and
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enable <code>config.active_record.whitelist_attributes</code> in your <code>config/application.rb</code> ASAP!)</li>
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</ul><h3>
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<a name="302" class="anchor" href="#302"><span class="octicon octicon-link"></span></a>3.0.2</h3>
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<ul>
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<li>Fix for ancestry-loop detection (performed by a validation, not through raising an exception in before_save)</li>
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</ul><h3>
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<a name="301" class="anchor" href="#301"><span class="octicon octicon-link"></span></a>3.0.1</h3>
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<ul>
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<li>Support 3.2.0's fickle deprecation of InstanceMethods (Thanks, <a href="https://github.com/mceachen/closure_tree/pull/5">jheiss</a>)!</li>
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</ul><h3>
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<a name="300" class="anchor" href="#300"><span class="octicon octicon-link"></span></a>3.0.0</h3>
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<p>See <a href="https://github.com/mceachen/closure_tree/blob/master/CHANGELOG.md">https://github.com/mceachen/closure_tree/blob/master/CHANGELOG.md</a></p>
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<ul>
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<li>Support for polymorphic trees</li>
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<li>
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<code>find_by_path</code> and <code>find_or_create_by_path</code> signatures changed to support constructor attributes</li>
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<li>tested against Rails 3.1.3</li>
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</ul><h3>
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<a name="200" class="anchor" href="#200"><span class="octicon octicon-link"></span></a>2.0.0</h3>
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<ul>
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<li>Had to increment the major version, as rebuild! will need to be called by prior consumers to support the new <code>leaves</code> class and instance methods.</li>
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<li>Tag deletion is supported now along with <code>:dependent =&gt; :destroy</code> and <code>:dependent =&gt; :delete_all</code>
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</li>
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<li>Switched from default rails plugin directory structure to rspec</li>
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<li>Support for running specs under different database engines: <code>export DB ; for DB in sqlite3 mysql postgresql ; do rake ; done</code>
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</li>
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</ul><h2>
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<h2>
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<a name="thanks-to" class="anchor" href="#thanks-to"><span class="octicon octicon-link"></span></a>Thanks to</h2>
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<ul>

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