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<h2 id="_params">params</h2>
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<h3 id="_purpose">Purpose</h3>
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<p>A mutable multi-dimensional map (hash) of request (CGI) parameters.</p>
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<p>To obtain a request parameter called <code>id</code>:</p>
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<pre class="CodeRay highlight"><code data-lang="groovy"><span class="type">class</span> <span class="class">BookController</span> {
<span class="keyword">def</span> <span class="function">show</span>() {
<span class="keyword">def</span> book = <span class="predefined-type">Book</span>.get(params.id)
}
}</code></pre>
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<p>To perform data binding (see <a href="../../guide/theWebLayer.html#dataBinding">data binding</a> in the user guide):</p>
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<pre class="CodeRay highlight"><code data-lang="groovy"><span class="keyword">def</span> <span class="function">save</span>() {
<span class="keyword">def</span> book = <span class="keyword">new</span> <span class="predefined-type">Book</span>(params) <span class="comment">// bind request parameters onto properties of book</span>
}</code></pre>
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<h3 id="_description">Description</h3>
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<p>The standard Servlet API provides access to parameters with the <code>HttpServletRequest</code> object. Although Grails provides the same capability through the <a href="request.html">request</a> object, it goes a bit further by providing a mutable map of request parameters called <code>params</code>.</p>
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<p>The <code>params</code> object can be indexed into using the array index operator or de-reference operator, so given the URL <code>/hello?foo=bar</code> you can access <code>foo</code> with</p>
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<pre>println params.foo</pre>
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<p>The params object can also be used to bind request parameters onto the properties of a domain class using either the constructor or the <a href="../Domain%20Classes/properties.html">properties</a> property:</p>
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<pre class="CodeRay highlight"><code data-lang="groovy"><span class="keyword">def</span> book = <span class="keyword">new</span> <span class="predefined-type">Book</span>(params)
book = <span class="predefined-type">Book</span>.get(<span class="integer">1</span>)
book.properties = params</code></pre>
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