@harishreddym/baqend
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Baqend JavaScript SDK
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<h1 class="page-title">Class: Operator<T></h1>
<section>
<header>
<h2><span class="attribs"><span class="type-signature"></span></span>
<span class="ancestors"><a href="query.html">query</a>.</span>Operator<T><span class="signature">(entityManager, resultClass, operator, childs)</span><span class="type-signature"></span></h2>
<div class="class-description"><p>An Operator saves the state of a combined query</p></div>
</header>
<article>
<div class="container-overview">
<h2>Constructor</h2>
<h4 class="name" id="Operator<T>"><span class="type-signature"></span>new Operator<T><span class="signature">(entityManager, resultClass, operator, childs)</span><span class="type-signature"></span></h4>
<h5>Parameters:</h5>
<table class="params table">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>entityManager</code></td>
<td class="type">
<span class="param-type"><a href="EntityManager.html">EntityManager</a></span>
</td>
<td class="description last"><p>The owning entity manager of this query</p></td>
</tr>
<tr>
<td class="name"><code>resultClass</code></td>
<td class="type">
<span class="param-type">Class.<T></span>
</td>
<td class="description last"><p>The query result class</p></td>
</tr>
<tr>
<td class="name"><code>operator</code></td>
<td class="type">
<span class="param-type">string</span>
</td>
<td class="description last"><p>The operator used to join the childs</p></td>
</tr>
<tr>
<td class="name"><code>childs</code></td>
<td class="type">
<span class="param-type">Array.<query.Node.<T>></span>
</td>
<td class="description last"><p>The childs to join</p></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="lib_query_Operator.js.html">lib/query/Operator.js</a>, <a href="lib_query_Operator.js.html#line11">line 11</a>
</li></ul></dd>
</dl>
</div>
<h3 class="subsection-title">Extends</h3>
<ul>
<li><a href="query.Node.html">query.Node</a></li>
</ul>
<h3 class="subsection-title">Members</h3>
<h4 class="name" id="childs"><span class="type-signature">(readonly) </span>childs<span class="type-signature"> :Array.<query.Node.<T>></span></h4>
<div class="description">
<p>The child Node of this query, it is always one</p>
</div>
<h5>Type:</h5>
<ul>
<li>
<span class="param-type">Array.<query.Node.<T>></span>
</li>
</ul>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="lib_query_Operator.js.html">lib/query/Operator.js</a>, <a href="lib_query_Operator.js.html#line33">line 33</a>
</li></ul></dd>
</dl>
<h4 class="name" id="entityManager"><span class="type-signature">(readonly) </span>entityManager<span class="type-signature"> :<a href="EntityManager.html">EntityManager</a></span></h4>
<div class="description">
<p>The owning EntityManager of this query</p>
</div>
<h5>Type:</h5>
<ul>
<li>
<span class="param-type"><a href="EntityManager.html">EntityManager</a></span>
</li>
</ul>
<dl class="details">
<dt class="inherited-from">Inherited From:</dt>
<dd class="inherited-from"><ul class="dummy"><li>
<a href="query.Query.html">query.Query<T>#entityManager</a>
</li></ul></dd>
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="lib_query_Query.js.html">lib/query/Query.js</a>, <a href="lib_query_Query.js.html#line14">line 14</a>
</li></ul></dd>
</dl>
<h4 class="name" id="firstResult"><span class="type-signature">(readonly) </span>firstResult<span class="type-signature"> :number</span></h4>
<div class="description">
<p>The offset how many results should be skipped</p>
</div>
<h5>Type:</h5>
<ul>
<li>
<span class="param-type">number</span>
</li>
</ul>
<dl class="details">
<dt class="inherited-from">Inherited From:</dt>
<dd class="inherited-from"><ul class="dummy"><li>
<a href="query.Node.html">query.Node<T>#firstResult</a>
</li></ul></dd>
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="lib_query_Node.js.html">lib/query/Node.js</a>, <a href="lib_query_Node.js.html#line27">line 27</a>
</li></ul></dd>
</dl>
<h4 class="name" id="maxResults"><span class="type-signature">(readonly) </span>maxResults<span class="type-signature"> :number</span></h4>
<div class="description">
<p>The limit how many objects should be returned</p>
</div>
<h5>Type:</h5>
<ul>
<li>
<span class="param-type">number</span>
</li>
</ul>
<dl class="details">
<dt class="inherited-from">Inherited From:</dt>
<dd class="inherited-from"><ul class="dummy"><li>
<a href="query.Node.html">query.Node<T>#maxResults</a>
</li></ul></dd>
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="lib_query_Node.js.html">lib/query/Node.js</a>, <a href="lib_query_Node.js.html#line34">line 34</a>
</li></ul></dd>
</dl>
<h4 class="name" id="operator"><span class="type-signature">(readonly) </span>operator<span class="type-signature"> :string</span></h4>
<div class="description">
<p>The operator used to join the child queries</p>
</div>
<h5>Type:</h5>
<ul>
<li>
<span class="param-type">string</span>
</li>
</ul>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="lib_query_Operator.js.html">lib/query/Operator.js</a>, <a href="lib_query_Operator.js.html#line26">line 26</a>
</li></ul></dd>
</dl>
<h4 class="name" id="order"><span class="type-signature">(readonly) </span>order<span class="type-signature"> :Object.<string, number></span></h4>
<div class="description">
<p>The properties which should be used sort the result</p>
</div>
<h5>Type:</h5>
<ul>
<li>
<span class="param-type">Object.<string, number></span>
</li>
</ul>
<dl class="details">
<dt class="inherited-from">Inherited From:</dt>
<dd class="inherited-from"><ul class="dummy"><li>
<a href="query.Node.html">query.Node<T>#order</a>
</li></ul></dd>
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="lib_query_Node.js.html">lib/query/Node.js</a>, <a href="lib_query_Node.js.html#line41">line 41</a>
</li></ul></dd>
</dl>
<h4 class="name" id="resultClass"><span class="type-signature">(readonly) </span>resultClass<span class="type-signature"> :Class.<T></span></h4>
<div class="description">
<p>The result class of this query</p>
</div>
<h5>Type:</h5>
<ul>
<li>
<span class="param-type">Class.<T></span>
</li>
</ul>
<dl class="details">
<dt class="inherited-from">Inherited From:</dt>
<dd class="inherited-from"><ul class="dummy"><li>
<a href="query.Query.html">query.Query<T>#resultClass</a>
</li></ul></dd>
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="lib_query_Query.js.html">lib/query/Query.js</a>, <a href="lib_query_Query.js.html#line21">line 21</a>
</li></ul></dd>
</dl>
<h3 class="subsection-title">Methods</h3>
<h4 class="name" id="ascending"><span class="type-signature"></span>ascending<span class="signature">(field)</span><span class="type-signature"> → {this}</span></h4>
<div class="description">
<p>Add an ascending sort for the specified field to this query</p>
</div>
<h5>Parameters:</h5>
<table class="params table">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>field</code></td>
<td class="type">
<span class="param-type">string</span>
</td>
<td class="description last"><p>The field to sort</p></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="inherited-from">Inherited From:</dt>
<dd class="inherited-from"><ul class="dummy"><li>
<a href="query.Query.html">query.Query<T>#ascending</a>
</li></ul></dd>
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="lib_query_Query.js.html">lib/query/Query.js</a>, <a href="lib_query_Query.js.html#line29">line 29</a>
</li></ul></dd>
</dl>
<h5>Returns:</h5>
<div class="param-desc">
<p>The resulting Query</p>
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">this</span>
</dd>
</dl>
<h4 class="name" id="count"><span class="type-signature"></span>count<span class="signature">(doneCallback<span class="signature-attributes">opt</span>, failCallback<span class="signature-attributes">opt</span>)</span><span class="type-signature"> → {Promise.<number>}</span></h4>
<div class="description">
<p>Execute the query that returns the matching objects count.</p>
</div>
<h5>Parameters:</h5>
<table class="params table">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Attributes</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>doneCallback</code></td>
<td class="type">
<span class="param-type"><a href="query.Query.html#~countCallback">query.Query~countCallback</a></span>
</td>
<td class="attributes">
<optional><br>
</td>
<td class="description last"><p>Called when the operation succeed.</p></td>
</tr>
<tr>
<td class="name"><code>failCallback</code></td>
<td class="type">
<span class="param-type"><a href="query.Query.html#~failCallback">query.Query~failCallback</a></span>
</td>
<td class="attributes">
<optional><br>
</td>
<td class="description last"><p>Called when there is a server-side error</p></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="inherited-from">Inherited From:</dt>
<dd class="inherited-from"><ul class="dummy"><li>
<a href="query.Query.html">query.Query<T>#count</a>
</li></ul></dd>
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="lib_query_Query.js.html">lib/query/Query.js</a>, <a href="lib_query_Query.js.html#line272">line 272</a>
</li></ul></dd>
</dl>
<h5>Returns:</h5>
<div class="param-desc">
<p>The total number of matched objects</p>
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">Promise.<number></span>
</dd>
</dl>
<h4 class="name" id="descending"><span class="type-signature"></span>descending<span class="signature">(field)</span><span class="type-signature"> → {this}</span></h4>
<div class="description">
<p>Add an decending sort for the specified field to this query</p>
</div>
<h5>Parameters:</h5>
<table class="params table">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>field</code></td>
<td class="type">
<span class="param-type">string</span>
</td>
<td class="description last"><p>The field to sort</p></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="inherited-from">Inherited From:</dt>
<dd class="inherited-from"><ul class="dummy"><li>
<a href="query.Query.html">query.Query<T>#descending</a>
</li></ul></dd>
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="lib_query_Query.js.html">lib/query/Query.js</a>, <a href="lib_query_Query.js.html#line38">line 38</a>
</li></ul></dd>
</dl>
<h5>Returns:</h5>
<div class="param-desc">
<p>The resulting Query</p>
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">this</span>
</dd>
</dl>
<h4 class="name" id="eventStream"><span class="type-signature"></span>eventStream<span class="signature">(onNext<span class="signature-attributes">opt</span>, onError<span class="signature-attributes">opt</span>, onComplete<span class="signature-attributes">opt</span>)</span><span class="type-signature"> → {Subscription}</span></h4>
<div class="description">
<p>Returns a subscription that handles change events for a real-time query.</p>
<p>The underlying stream object is hidden. To create multiple subscriptions on the same stream, create the stream<br>object first and then subscribe to the stream (see the other signature <code>#eventStream(options)</code>).</p>
</div>
<h5>Parameters:</h5>
<table class="params table">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Attributes</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>onNext</code></td>
<td class="type">
<span class="param-type"><a href="query.Query.html#~nextEventCallback">query.Query~nextEventCallback</a></span>
</td>
<td class="attributes">
<optional><br>
</td>
<td class="description last"><p>Called when an event is received</p></td>
</tr>
<tr>
<td class="name"><code>onError</code></td>
<td class="type">
<span class="param-type"><a href="query.Query.html#~failCallback">query.Query~failCallback</a></span>
</td>
<td class="attributes">
<optional><br>
</td>
<td class="description last"><p>Called when there is a server-side error</p></td>
</tr>
<tr>
<td class="name"><code>onComplete</code></td>
<td class="type">
<span class="param-type"><a href="query.Query.html#~completeCallback">query.Query~completeCallback</a></span>
</td>
<td class="attributes">
<optional><br>
</td>
<td class="description last"><p>Called when the network connection is closed (e.g. because of<br>lost Wi-Fi connection)</p></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="inherited-from">Inherited From:</dt>
<dd class="inherited-from"><ul class="dummy"><li>
<a href="query.Query.html">query.Query<T>#eventStream</a>
</li></ul></dd>
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="lib_query_Query.js.html">lib/query/Query.js</a>, <a href="lib_query_Query.js.html#line189">line 189</a>
</li></ul></dd>
</dl>
<h5>Returns:</h5>
<div class="param-desc">
<p>a real-time query subscription</p>
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">Subscription</span>
</dd>
</dl>
<h4 class="name" id="limit"><span class="type-signature"></span>limit<span class="signature">(limit)</span><span class="type-signature"> → {this}</span></h4>
<div class="description">
<p>Sets the limit of this query, i.e hox many objects should be returnd</p>
</div>
<h5>Parameters:</h5>
<table class="params table">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>limit</code></td>
<td class="type">
<span class="param-type">number</span>
</td>
<td class="description last"><p>The limit of this query</p></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="inherited-from">Inherited From:</dt>
<dd class="inherited-from"><ul class="dummy"><li>
<a href="query.Query.html">query.Query<T>#limit</a>
</li></ul></dd>
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="lib_query_Query.js.html">lib/query/Query.js</a>, <a href="lib_query_Query.js.html#line80">line 80</a>
</li></ul></dd>
<dt class="tag-see">See:</dt>
<dd class="tag-see">
<ul>
<li><a href="http://docs.mongodb.org/manual/reference/method/cursor.limit/">http://docs.mongodb.org/manual/reference/method/cursor.limit/</a></li>
</ul>
</dd>
</dl>
<h5>Returns:</h5>
<div class="param-desc">
<p>The resulting Query</p>
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">this</span>
</dd>
</dl>
<h4 class="name" id="offset"><span class="type-signature"></span>offset<span class="signature">(offset)</span><span class="type-signature"> → {this}</span></h4>
<div class="description">
<p>Sets the offset of the query, i.e. how many elements should be skipped</p>
</div>
<h5>Parameters:</h5>
<table class="params table">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>offset</code></td>
<td class="type">
<span class="param-type">number</span>
</td>
<td class="description last"><p>The offset of this query</p></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="inherited-from">Inherited From:</dt>
<dd class="inherited-from"><ul class="dummy"><li>
<a href="query.Query.html">query.Query<T>#offset</a>
</li></ul></dd>
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="lib_query_Query.js.html">lib/query/Query.js</a>, <a href="lib_query_Query.js.html#line65">line 65</a>
</li></ul></dd>
<dt class="tag-see">See:</dt>
<dd class="tag-see">
<ul>
<li><a href="http://docs.mongodb.org/manual/reference/method/cursor.skip/">http://docs.mongodb.org/manual/reference/method/cursor.skip/</a></li>
</ul>
</dd>
</dl>
<h5>Returns:</h5>
<div class="param-desc">
<p>The resulting Query</p>
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">this</span>
</dd>
</dl>
<h4 class="name" id="resultList"><span class="type-signature"></span>resultList<span class="signature">(doneCallback<span class="signature-attributes">opt</span>, failCallback<span class="signature-attributes">opt</span>)</span><span class="type-signature"> → {Promise.<Array.<T>>}</span></h4>
<div class="description">
<p>Execute the query and return the query results as a List</p>
<p>Note: All local unsaved changes on matching objects, will be discarded.</p>
</div>
<h5>Parameters:</h5>
<table class="params table">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Attributes</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>doneCallback</code></td>
<td class="type">
<span class="param-type"><a href="query.Query.html#~resultListCallback">query.Query~resultListCallback</a></span>
</td>
<td class="attributes">
<optional><br>
</td>
<td class="description last"><p>Called when the operation succeed.</p></td>
</tr>
<tr>
<td class="name"><code>failCallback</code></td>
<td class="type">
<span class="param-type"><a href="query.Query.html#~failCallback">query.Query~failCallback</a></span>
</td>
<td class="attributes">
<optional><br>
</td>
<td class="description last"><p>Called when the operation failed.</p></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="inherited-from">Inherited From:</dt>
<dd class="inherited-from"><ul class="dummy"><li>
<a href="query.Query.html">query.Query<T>#resultList</a>
</li></ul></dd>
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="lib_query_Query.js.html">lib/query/Query.js</a>, <a href="lib_query_Query.js.html#line102">line 102</a>
</li></ul></dd>
</dl>
<h5>Returns:</h5>
<div class="param-desc">
<p>A promise that will be resolved with the query result as a list</p>
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">Promise.<Array.<T>></span>
</dd>
</dl>
<h4 class="name" id="resultStream"><span class="type-signature"></span>resultStream<span class="signature">(onNext<span class="signature-attributes">opt</span>, onError<span class="signature-attributes">opt</span>)</span><span class="type-signature"> → {Subscription}</span></h4>
<div class="description">
<p>Returns a subscription that handles the complete real-time query result</p>
<p>The full result is received initially (i.e. on subscription) and on every change.</p>
<p>The underlying stream object is hidden. To create multiple subscriptions on the same stream, create the stream<br>object first and then subscribe to the stream (see the other signature <code>#resultStream(options)</code>).</p>
<p>As the real-time query will reconnect infinitely often, there is no onComplete callback. (In other words, the<br>observable will never complete.)</p>
</div>
<h5>Parameters:</h5>
<table class="params table">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Attributes</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>onNext</code></td>
<td class="type">
<span class="param-type"><a href="query.Query.html#~nextResultCallback">query.Query~nextResultCallback</a></span>
</td>
<td class="attributes">
<optional><br>
</td>
<td class="description last"><p>Called when the query result changes in any way</p></td>
</tr>
<tr>
<td class="name"><code>onError</code></td>
<td class="type">
<span class="param-type"><a href="query.Query.html#~failCallback">query.Query~failCallback</a></span>
</td>
<td class="attributes">
<optional><br>
</td>
<td class="description last"><p>Called when there is a server-side error</p></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="inherited-from">Inherited From:</dt>
<dd class="inherited-from"><ul class="dummy"><li>
<a href="query.Query.html">query.Query<T>#resultStream</a>
</li></ul></dd>
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="lib_query_Query.js.html">lib/query/Query.js</a>, <a href="lib_query_Query.js.html#line247">line 247</a>
</li></ul></dd>
</dl>
<h5>Returns:</h5>
<div class="param-desc">
<p>a real-time query subscription handling complete query results.</p>
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">Subscription</span>
</dd>
</dl>
<h4 class="name" id="singleResult"><span class="type-signature"></span>singleResult<span class="signature">(doneCallback<span class="signature-attributes">opt</span>, failCallback<span class="signature-attributes">opt</span>)</span><span class="type-signature"> → {Promise.<?T>}</span></h4>
<div class="description">
<p>Execute the query that returns a single result</p>
<p>Note: All local unsaved changes on the matched object, will be discarded.</p>
</div>
<h5>Parameters:</h5>
<table class="params table">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Attributes</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>doneCallback</code></td>
<td class="type">
<span class="param-type"><a href="query.Query.html#~singleResultCallback">query.Query~singleResultCallback</a></span>
</td>
<td class="attributes">
<optional><br>
</td>
<td class="description last"><p>Called when the operation succeed.</p></td>
</tr>
<tr>
<td class="name"><code>failCallback</code></td>
<td class="type">
<span class="param-type"><a href="query.Query.html#~failCallback">query.Query~failCallback</a></span>
</td>
<td class="attributes">
<optional><br>
</td>
<td class="description last"><p>Called when the operation failed.</p></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="inherited-from">Inherited From:</dt>
<dd class="inherited-from"><ul class="dummy"><li>
<a href="query.Query.html">query.Query<T>#singleResult</a>
</li></ul></dd>
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="lib_query_Query.js.html">lib/query/Query.js</a>, <a href=