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                  <a href="https://github.com/WoltLab/docs.woltlab.com/edit/5.4/docs/migration/wsc31/like.md" title="Edit this page" class="md-content__button md-icon">
                    <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M20.71 7.04c.39-.39.39-1.04 0-1.41l-2.34-2.34c-.37-.39-1.02-.39-1.41 0l-1.84 1.83 3.75 3.75M3 17.25V21h3.75L17.81 9.93l-3.75-3.75L3 17.25z"/></svg>
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                <h1 id="migrating-from-wsc-31-like-system">Migrating from WSC 3.1 - Like System<a class="headerlink" href="#migrating-from-wsc-31-like-system" title="Permanent link">#</a></h1>
<h2 id="introduction">Introduction<a class="headerlink" href="#introduction" title="Permanent link">#</a></h2>
<p>With version 5.2 of WoltLab Suite Core the like system was completely replaced by the new reactions system. This makes it necessary to make some adjustments to existing code so that your plugin integrates completely into the new system. However, we have kept these adjustments as small as possible so that it is possible to use the reaction system with slight restrictions even without adjustments. </p>
<h2 id="limitations-if-no-adjustments-are-made-to-the-existing-code">Limitations if no adjustments are made to the existing code<a class="headerlink" href="#limitations-if-no-adjustments-are-made-to-the-existing-code" title="Permanent link">#</a></h2>
<p>If no adjustments are made to the existing code, the following functions are not available: 
* Notifications about reactions/likes
* Recent Activity Events for reactions/likes</p>
<h2 id="migration">Migration<a class="headerlink" href="#migration" title="Permanent link">#</a></h2>
<h3 id="notifications">Notifications<a class="headerlink" href="#notifications" title="Permanent link">#</a></h3>
<h4 id="mark-notification-as-compatible">Mark notification as compatible<a class="headerlink" href="#mark-notification-as-compatible" title="Permanent link">#</a></h4>
<p>Since there are no more likes with the new version, it makes no sense to send notifications about it. Instead of notifications about likes, notifications about reactions are now sent. However, this only changes the notification text and not the notification itself. To update the notification, we first add the interface <code>\wcf\data\reaction\object\IReactionObject</code> to the <code>\wcf\data\like\object\ILikeObject</code> object (e.g. in WoltLab Suite Forum we added the interface to the class <code>\wbb\data\post\LikeablePost</code>). After that the object is marked as "compatible with WoltLab Suite Core 5.2" and notifications about reactions are sent again. </p>
<h4 id="language-variables">Language Variables<a class="headerlink" href="#language-variables" title="Permanent link">#</a></h4>
<p>Next, to display all reactions for the current notification in the notification text, we include the trait <code>\wcf\system\user\notification\event\TReactionUserNotificationEvent</code> in the user notification event class (typically named like <code>*LikeUserNotificationEvent</code>). These trait provides a new function that reads out and groups the reactions. The result of this function must now only be passed to the language variable. The name "reactions" is typically used as the variable name for the language variable. </p>
<p>As a final step, we only need to change the language variables themselves. To ensure a consistent usability, the same formulations should be used as in the WoltLab Suite Core. </p>
<h5 id="english">English<a class="headerlink" href="#english" title="Permanent link">#</a></h5>
<p><code>{prefix}.like.title</code>
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal">1</span></pre></div></td><td class="code"><div class="highlight"><pre><span></span><code>Reaction to a {objectName}
</code></pre></div>
</td></tr></table></p>
<p><code>{prefix}.like.title.stacked</code></p>
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal">1</span></pre></div></td><td class="code"><div class="highlight"><pre><span></span><code>{#$count} users reacted to your {objectName}
</code></pre></div>
</td></tr></table>
<p><code>{prefix}.like.message</code>
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal">1</span></pre></div></td><td class="code"><div class="highlight"><pre><span></span><code>{@$author-&gt;getAnchorTag()} reacted to your {objectName} ({implode from=$reactions key=reactionID item=count}{@$__wcf-&gt;getReactionHandler()-&gt;getReactionTypeByID($reactionID)-&gt;renderIcon()}×{#$count}{/implode}).
</code></pre></div>
</td></tr></table></p>
<p><code>{prefix}.like.message.stacked</code></p>
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal">1</span></pre></div></td><td class="code"><div class="highlight"><pre><span></span><code>{if $count &lt; 4}{@$authors[0]-&gt;getAnchorTag()}{if $count == 2} and {else}, {/if}{@$authors[1]-&gt;getAnchorTag()}{if $count == 3} and {@$authors[2]-&gt;getAnchorTag()}{/if}{else}{@$authors[0]-&gt;getAnchorTag()} and {#$others} others{/if} reacted to your {objectName} ({implode from=$reactions key=reactionID item=count}{@$__wcf-&gt;getReactionHandler()-&gt;getReactionTypeByID($reactionID)-&gt;renderIcon()}×{#$count}{/implode}).
</code></pre></div>
</td></tr></table>
<p><code>wcf.user.notification.{objectTypeName}.like.notification.like</code>
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal">1</span></pre></div></td><td class="code"><div class="highlight"><pre><span></span><code>Notify me when someone reacted to my {objectName}
</code></pre></div>
</td></tr></table></p>
<h5 id="german">German<a class="headerlink" href="#german" title="Permanent link">#</a></h5>
<p><code>{prefix}.like.title</code>
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal">1</span></pre></div></td><td class="code"><div class="highlight"><pre><span></span><code>Reaktion auf einen {objectName}
</code></pre></div>
</td></tr></table></p>
<p><code>{prefix}.like.title.stacked</code></p>
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal">1</span></pre></div></td><td class="code"><div class="highlight"><pre><span></span><code>{#$count} Benutzern haben auf {if LANGUAGE_USE_INFORMAL_VARIANT}dein(en){else}Ihr(en){/if} {objectName} reagiert
</code></pre></div>
</td></tr></table>
<p><code>{prefix}.like.message</code>
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal">1</span></pre></div></td><td class="code"><div class="highlight"><pre><span></span><code>{@$author-&gt;getAnchorTag()} hat auf {if LANGUAGE_USE_INFORMAL_VARIANT}dein(en){else}Ihr(en){/if} {objectName} reagiert ({implode from=$reactions key=reactionID item=count}{@$__wcf-&gt;getReactionHandler()-&gt;getReactionTypeByID($reactionID)-&gt;renderIcon()}×{#$count}{/implode}).
</code></pre></div>
</td></tr></table></p>
<p><code>{prefix}.like.message.stacked</code></p>
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal">1</span></pre></div></td><td class="code"><div class="highlight"><pre><span></span><code>{if $count &lt; 4}{@$authors[0]-&gt;getAnchorTag()}{if $count == 2} und {else}, {/if}{@$authors[1]-&gt;getAnchorTag()}{if $count == 3} und {@$authors[2]-&gt;getAnchorTag()}{/if}{else}{@$authors[0]-&gt;getAnchorTag()} und {#$others} weitere{/if} haben auf {if LANGUAGE_USE_INFORMAL_VARIANT}dein(en){else}Ihr(en){/if} {objectName} reagiert ({implode from=$reactions key=reactionID item=count}{@$__wcf-&gt;getReactionHandler()-&gt;getReactionTypeByID($reactionID)-&gt;renderIcon()}×{#$count}{/implode}).
</code></pre></div>
</td></tr></table>
<p><code>wcf.user.notification.{object_type_name}.like.notification.like</code>
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal">1</span></pre></div></td><td class="code"><div class="highlight"><pre><span></span><code>Jemandem hat auf {if LANGUAGE_USE_INFORMAL_VARIANT}dein(en){else}Ihr(en){/if} {objectName} reagiert
</code></pre></div>
</td></tr></table></p>
<h3 id="recent-activity">Recent Activity<a class="headerlink" href="#recent-activity" title="Permanent link">#</a></h3>
<p>To adjust entries in the Recent Activity, only three small steps are necessary. First we pass the concrete reaction to the language variable, so that we can use the reaction object there. To do this, we add the following variable to the text of the <code>\wcf\system\user\activity\event\IUserActivityEvent</code> object: <code>$event-&gt;reactionType</code>. Typically we name the variable <code>reactionType</code>. In the second step, we mark the event as compatible. Therefore we set the parameter <code>supportsReactions</code> in the <a href="../../../package/pip/object-type/"><code>objectType.xml</code></a> to <code>1</code>. So for example the entry looks like this:</p>
<div class="titledCodeBox">
    <div class="codeBoxTitle"><code>objectType.xml</code></div>
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal">1</span>
<span class="normal">2</span>
<span class="normal">3</span>
<span class="normal">4</span>
<span class="normal">5</span>
<span class="normal">6</span></pre></div></td><td class="code"><div class="highlight"><pre><span></span><code><span class="nt">&lt;type&gt;</span>
    <span class="nt">&lt;name&gt;</span>com.woltlab.example.likeableObject.recentActivityEvent<span class="nt">&lt;/name&gt;</span>
    <span class="nt">&lt;definitionname&gt;</span>com.woltlab.wcf.user.recentActivityEvent<span class="nt">&lt;/definitionname&gt;</span>
    <span class="nt">&lt;classname&gt;</span>wcf\system\user\activity\event\LikeableObjectUserActivityEvent<span class="nt">&lt;/classname&gt;</span>
    <span class="nt">&lt;supportsReactions&gt;</span>1<span class="nt">&lt;/supportsReactions&gt;</span>
<span class="nt">&lt;/type&gt;</span>
</code></pre></div>
</td></tr></table>
</div>

<p>Finally we modify our language variable. To ensure a consistent usability, the same formulations should be used as in the WoltLab Suite Core.</p>
<h4 id="english_1">English<a class="headerlink" href="#english_1" title="Permanent link">#</a></h4>
<p><code>wcf.user.recentActivity.{object_type_name}.recentActivityEvent</code>
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal">1</span></pre></div></td><td class="code"><div class="highlight"><pre><span></span><code>Reaction ({objectName})
</code></pre></div>
</td></tr></table></p>
<p><em>Your language variable for the recent activity text</em>
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal">1</span></pre></div></td><td class="code"><div class="highlight"><pre><span></span><code>Reacted with &lt;span title=&quot;{$reactionType-&gt;getTitle()}&quot; class=&quot;jsTooltip&quot;&gt;{@$reactionType-&gt;renderIcon()}&lt;/span&gt; to the {objectName}.
</code></pre></div>
</td></tr></table></p>
<h4 id="german_1">German<a class="headerlink" href="#german_1" title="Permanent link">#</a></h4>
<p><code>wcf.user.recentActivity.{objectTypeName}.recentActivityEvent</code>
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal">1</span></pre></div></td><td class="code"><div class="highlight"><pre><span></span><code>Reaktion ({objectName})
</code></pre></div>
</td></tr></table></p>
<p><em>Your language variable for the recent activity text</em>
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal">1</span></pre></div></td><td class="code"><div class="highlight"><pre><span></span><code>Hat mit &lt;span title=&quot;{$reactionType-&gt;getTitle()}&quot; class=&quot;jsTooltip&quot;&gt;{@$reactionType-&gt;renderIcon()}&lt;/span&gt; auf {objectName} reagiert.
</code></pre></div>
</td></tr></table></p>
<h3 id="comments">Comments<a class="headerlink" href="#comments" title="Permanent link">#</a></h3>
<p>If comments send notifications, they must also be updated. The language variables are changed in the same way as described in the section <a href="./#Language-Variables">Notifications / Language</a>. After that comment must be marked as compatible. Therefore we set the parameter <code>supportsReactions</code> in the <a href="../../../package/pip/object-type/"><code>objectType.xml</code></a> to <code>1</code>. So for example the entry looks like this: </p>
<div class="titledCodeBox">
    <div class="codeBoxTitle"><code>objectType.xml</code></div>
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal">1</span>
<span class="normal">2</span>
<span class="normal">3</span>
<span class="normal">4</span>
<span class="normal">5</span>
<span class="normal">6</span>
<span class="normal">7</span>
<span class="normal">8</span></pre></div></td><td class="code"><div class="highlight"><pre><span></span><code><span class="nt">&lt;type&gt;</span>
    <span class="nt">&lt;name&gt;</span>com.woltlab.wcf.objectComment.response.like.notification<span class="nt">&lt;/name&gt;</span>
    <span class="nt">&lt;definitionname&gt;</span>com.woltlab.wcf.notification.objectType<span class="nt">&lt;/definitionname&gt;</span>
    <span class="nt">&lt;classname&gt;</span>wcf\system\user
otification\object  ype\LikeUserNotificationObjectType<span class="nt">&lt;/classname&gt;</span>
    <span class="nt">&lt;category&gt;</span>com.woltlab.example<span class="nt">&lt;/category&gt;</span>
    <span class="nt">&lt;supportsReactions&gt;</span>1<span class="nt">&lt;/supportsReactions&gt;</span>
<span class="nt">&lt;/type&gt;</span>
</code></pre></div>
</td></tr></table>
</div>

<h2 id="forward-compatibility">Forward Compatibility<a class="headerlink" href="#forward-compatibility" title="Permanent link">#</a></h2>
<p>So that these changes also work in older versions of WoltLab Suite Core, the used classes and traits were backported with WoltLab Suite Core 3.0.22 and WoltLab Suite Core 3.1.10.</p>
                
                  
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