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<h2>FilterMany </h2>
<p>
This applies a filter on the beans returned for a <code>OneToMany</code> or <code>ManyToMany</code>
relationship.
</p>
<p>
For example, Customer has <em>OneToMany</em> Orders. Instead of fetching <em>ALL</em> the orders for the
customers being fetched we instead only want to fetch the new orders they placed since last week.
</p>
<p>
We use <code>filterMany()</code> to apply the filter to the orders fetched for each customer.
</p>
<h5>filterMany with simple string expression</h5>
<div class="syntax java"><div class="highlight"><pre><span></span><span class="c1">// query customers fetching 'new orders since last week' ...</span>
<span class="n">List</span><span class="o"><</span><span class="n">Customer</span><span class="o">></span> <span class="n">customers</span>
<span class="o">=</span> <span class="k">new</span> <span class="n">QCustomer</span><span class="o">()</span>
<span class="o">.</span><span class="na field">name</span><span class="o">.</span><span class="na">istartsWith</span><span class="o">(</span><span class="s">"Rob"</span><span class="o">)</span>
<span class="o">.</span><span class="na field">orders</span><span class="o">.</span><span class="na">filterMany</span><span class="o">(</span><span class="s">"status = ? and orderDate > ?"</span><span class="o">,</span> <span class="n">Order</span><span class="o">.</span><span class="na field">Status</span><span class="o">.</span><span class="na">COMPLETE</span><span class="o">,</span> <span class="n">lastWeek</span><span class="o">)</span>
<span class="o">.</span><span class="na">findList</span><span class="o">();</span>
</pre></div>
</div>
<p>
In the above example are using a string expression with <code>?</code> as bind parameter
placeholders. This is a relatively easy way to add a simple expression.
</p>
<p>
Below is the same query where instead of using a string expression we create
an <code>ExpressionList</code> to use for the <code>filterMany</code>.
</p>
<h5>filterMany with ExpressionList expression</h5>
<div class="syntax java"><div class="highlight"><pre><span></span><span class="c1">// filter orders - status COMPLETE since last week</span>
<span class="n">ExpressionList</span><span class="o"><</span><span class="n">Order</span><span class="o">></span> <span class="n">filterOrders</span> <span class="o">=</span> <span class="k">new</span> <span class="n">QOrder</span><span class="o">()</span>
<span class="o">.</span><span class="na field">status</span><span class="o">.</span><span class="na">eq</span><span class="o">(</span><span class="n">Order</span><span class="o">.</span><span class="na field">Status</span><span class="o">.</span><span class="na">COMPLETE</span><span class="o">)</span>
<span class="o">.</span><span class="na field">orderDate</span><span class="o">.</span><span class="na">greaterThan</span><span class="o">(</span><span class="n">lastWeek</span><span class="o">)</span>
<span class="o">.</span><span class="na">getExpressionList</span><span class="o">();</span>
<span class="c1">// query customers fetching 'new orders since last week' ...</span>
<span class="n">List</span><span class="o"><</span><span class="n">Customer</span><span class="o">></span> <span class="n">customers</span>
<span class="o">=</span> <span class="k">new</span> <span class="n">QCustomer</span><span class="o">()</span>
<span class="o">.</span><span class="na field">name</span><span class="o">.</span><span class="na">istartsWith</span><span class="o">(</span><span class="s">"Rob"</span><span class="o">)</span> <span class="c1">// (1) filter customers</span>
<span class="o">.</span><span class="na field">orders</span><span class="o">.</span><span class="na">filterMany</span><span class="o">(</span><span class="n">filterOrders</span><span class="o">)</span> <span class="c1">// (2) filter the orders for those customers</span>
<span class="o">.</span><span class="na">findList</span><span class="o">();</span>
</pre></div>
</div>
<h5>Example</h5>
<p>
Find customers and their contacts. Filter the contacts to only the contacts
whose first name starts with 'Rob'.
</p>
<div class="syntax java"><div class="highlight"><pre><span></span><span class="n">List</span><span class="o"><</span><span class="n">Customer</span><span class="o">></span> <span class="n">customers</span> <span class="o">=</span>
<span class="k">new</span> <span class="n">QCustomer</span><span class="o">()</span>
<span class="o">.</span><span class="na field">status</span><span class="o">.</span><span class="na">eq</span><span class="o">(</span><span class="n">Status</span><span class="o">.</span><span class="na">NEW</span><span class="o">)</span>
<span class="o">.</span><span class="na field">contacts</span><span class="o">.</span><span class="na">filterMany</span><span class="o">(</span><span class="s">"firstName istartsWith ?"</span><span class="o">,</span> <span class="s">"Rob"</span><span class="o">)</span>
<span class="o">.</span><span class="na">findList</span><span class="o">();</span>
</pre></div>
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