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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `Params` struct in crate `actix_web`."><meta name="keywords" content="rust, rustlang, rust-lang, Params"><title>actix_web::dev::Params - Rust</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script src="../../storage.js"></script></head><body class="rustdoc struct"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><p class='location'>Struct Params</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#methods">Methods</a><div class="sidebar-links"><a href="#method.is_empty">is_empty</a><a href="#method.len">len</a><a href="#method.get">get</a><a href="#method.unprocessed">unprocessed</a><a href="#method.query">query</a><a href="#method.iter">iter</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Debug">Debug</a><a href="#impl-Clone">Clone</a><a href="#impl-Index%3C%26%27a%20str%3E">Index<&'a str></a><a href="#impl-Index%3Cusize%3E">Index<usize></a></div><a class="sidebar-title" href="#synthetic-implementations">Auto Trait Implementations</a><div class="sidebar-links"><a href="#impl-Send">!Send</a><a href="#impl-Sync">!Sync</a></div></div><p class='location'><a href='../index.html'>actix_web</a>::<wbr><a href='index.html'>dev</a></p><script>window.sidebarCurrent = {name: 'Params', ty: 'struct', relpath: ''};</script><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><a id="settings-menu" href="../../settings.html"><img src="../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><span class='in-band'>Struct <a href='../index.html'>actix_web</a>::<wbr><a href='index.html'>dev</a>::<wbr><a class="struct" href=''>Params</a></span><span class='out-of-band'><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>−</span>]</a></span><a class='srclink' href='../../src/actix_web/param.rs.html#33-37' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><pre class='rust struct'>pub struct Params { /* fields omitted */ }</pre></div><div class='docblock'><p>Route match information</p>
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<p>If resource path contains variable patterns, <code>Params</code> stores this variables.</p>
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</div>
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<h2 id='methods' class='small-section-header'>
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Methods<a href='#methods' class='anchor'></a>
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</h2>
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<h3 id='impl' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="struct" href="../../actix_web/dev/struct.Params.html" title="struct actix_web::dev::Params">Params</a></code><a href='#impl' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/actix_web/param.rs.html#39-140' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.is_empty' class="method"><span id='is_empty.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.is_empty' class='fnname'>is_empty</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/actix_web/param.rs.html#78-80' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Check if there are any matched patterns</p>
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</div><h4 id='method.len' class="method"><span id='len.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.len' class='fnname'>len</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/actix_web/param.rs.html#83-85' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Check number of extracted parameters</p>
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</div><h4 id='method.get' class="method"><span id='get.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.get' class='fnname'>get</a>(&self, key: &<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><&<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/actix_web/param.rs.html#88-104' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Get matched parameter by name without type conversion</p>
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</div><h4 id='method.unprocessed' class="method"><span id='unprocessed.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.unprocessed' class='fnname'>unprocessed</a>(&self) -> &<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/actix_web/param.rs.html#107-109' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Get unprocessed part of path</p>
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</div><h4 id='method.query' class="method"><span id='query.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.query' class='fnname'>query</a><T: <a class="trait" href="../../actix_web/dev/trait.FromParam.html" title="trait actix_web::dev::FromParam">FromParam</a>>(&self, key: &<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <T as <a class="trait" href="../../actix_web/dev/trait.FromParam.html" title="trait actix_web::dev::FromParam">FromParam</a>>::<a class="type" href="../../actix_web/dev/trait.FromParam.html#associatedtype.Err" title="type actix_web::dev::FromParam::Err">Err</a>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/actix_web/param.rs.html#125-131' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Get matched <code>FromParam</code> compatible parameter by name.</p>
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<p>If keyed parameter is not available empty string is used as default
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value.</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">fn</span> <span class="ident">index</span>(<span class="ident">req</span>: <span class="ident">HttpRequest</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">String</span><span class="op">></span> {
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<span class="kw">let</span> <span class="ident">ivalue</span>: <span class="ident">isize</span> <span class="op">=</span> <span class="ident">req</span>.<span class="ident">match_info</span>().<span class="ident">query</span>(<span class="string">"val"</span>)<span class="question-mark">?</span>;
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<span class="prelude-val">Ok</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">"isuze value: {:?}"</span>, <span class="ident">ivalue</span>))
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}</pre>
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</div><h4 id='method.iter' class="method"><span id='iter.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.iter' class='fnname'>iter</a>(&self) -> ParamsIter</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/actix_web/param.rs.html#134-139' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Return iterator to items in parameter container</p>
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</div></div>
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<h2 id='implementations' class='small-section-header'>
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Trait Implementations<a href='#implementations' class='anchor'></a>
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</h2>
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<div id='implementations-list'><h3 id='impl-Debug' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="../../actix_web/dev/struct.Params.html" title="struct actix_web::dev::Params">Params</a></code><a href='#impl-Debug' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/actix_web/param.rs.html#32' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.fmt' class="method"><span id='fmt.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&self, f: &mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -> <a class="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/actix_web/param.rs.html#32' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
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</div></div><h3 id='impl-Clone' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> for <a class="struct" href="../../actix_web/dev/struct.Params.html" title="struct actix_web::dev::Params">Params</a></code><a href='#impl-Clone' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/actix_web/param.rs.html#32' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.clone' class="method"><span id='clone.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#tymethod.clone' class='fnname'>clone</a>(&self) -> <a class="struct" href="../../actix_web/dev/struct.Params.html" title="struct actix_web::dev::Params">Params</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/actix_web/param.rs.html#32' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Returns a copy of the value. <a href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#tymethod.clone">Read more</a></p>
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</div><h4 id='method.clone_from' class="method"><span id='clone_from.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#method.clone_from' class='fnname'>clone_from</a>(&mut self, source: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>Self)</code></span></td><td><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/clone.rs.html#130-132' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Performs copy-assignment from <code>source</code>. <a href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#method.clone_from">Read more</a></p>
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</div></div><h3 id='impl-Index%3C%26%27a%20str%3E' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<'a> <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/index/trait.Index.html" title="trait core::ops::index::Index">Index</a><&'a <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>> for <a class="struct" href="../../actix_web/dev/struct.Params.html" title="struct actix_web::dev::Params">Params</a></code><a href='#impl-Index%3C%26%27a%20str%3E' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/actix_web/param.rs.html#168-175' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='associatedtype.Output' class="type"><span id='Output.t' class='invisible'><code>type <a href='https://doc.rust-lang.org/nightly/core/ops/index/trait.Index.html#associatedtype.Output' class="type">Output</a> = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a></code></span></h4>
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<div class='docblock'><p>The returned type after indexing.</p>
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</div><h4 id='method.index' class="method"><span id='index.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/ops/index/trait.Index.html#tymethod.index' class='fnname'>index</a>(&self, name: &'a <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>) -> &<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/actix_web/param.rs.html#171-174' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Performs the indexing (<code>container[index]</code>) operation.</p>
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</div></div><h3 id='impl-Index%3Cusize%3E' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/index/trait.Index.html" title="trait core::ops::index::Index">Index</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>> for <a class="struct" href="../../actix_web/dev/struct.Params.html" title="struct actix_web::dev::Params">Params</a></code><a href='#impl-Index%3Cusize%3E' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/actix_web/param.rs.html#177-186' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='associatedtype.Output-1' class="type"><span id='Output.t-1' class='invisible'><code>type <a href='https://doc.rust-lang.org/nightly/core/ops/index/trait.Index.html#associatedtype.Output' class="type">Output</a> = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a></code></span></h4>
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<div class='docblock'><p>The returned type after indexing.</p>
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</div><h4 id='method.index-1' class="method"><span id='index.v-1' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/ops/index/trait.Index.html#tymethod.index' class='fnname'>index</a>(&self, idx: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -> &<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/actix_web/param.rs.html#180-185' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Performs the indexing (<code>container[index]</code>) operation.</p>
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</div></div></div>
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<h2 id='synthetic-implementations' class='small-section-header'>
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Auto Trait Implementations<a href='#synthetic-implementations' class='anchor'></a>
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</h2>
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<div id='synthetic-implementations-list'>
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<h3 id='impl-Send' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl !<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="../../actix_web/dev/struct.Params.html" title="struct actix_web::dev::Params">Params</a></code><a href='#impl-Send' class='anchor'></a></span></td><td><span class='out-of-band'></span></td></tr></tbody></table></h3><div class='impl-items'></div><h3 id='impl-Sync' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl !<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="../../actix_web/dev/struct.Params.html" title="struct actix_web::dev::Params">Params</a></code><a href='#impl-Sync' class='anchor'></a></span></td><td><span class='out-of-band'></span></td></tr></tbody></table></h3><div class='impl-items'></div></div></section><section id="search" class="content hidden"></section><section class="footer"></section><aside id="help" class="hidden"><div><h1 class="hidden">Help</h1><div class="shortcuts"><h2>Keyboard Shortcuts</h2><dl><dt><kbd>?</kbd></dt><dd>Show this help dialog</dd><dt><kbd>S</kbd></dt><dd>Focus the search field</dd><dt><kbd>↑</kbd></dt><dd>Move up in search results</dd><dt><kbd>↓</kbd></dt><dd>Move down in search results</dd><dt><kbd>↹</kbd></dt><dd>Switch tab</dd><dt><kbd>⏎</kbd></dt><dd>Go to active search result</dd><dt><kbd>+</kbd></dt><dd>Expand all sections</dd><dt><kbd>-</kbd></dt><dd>Collapse all sections</dd></dl></div><div class="infos"><h2>Search Tricks</h2><p>Prefix searches with a type followed by a colon (e.g. <code>fn:</code>) to restrict the search to a given type.</p><p>Accepted types are: <code>fn</code>, <code>mod</code>, <code>struct</code>, <code>enum</code>, <code>trait</code>, <code>type</code>, <code>macro</code>, and <code>const</code>.</p><p>Search functions by type signature (e.g. <code>vec -> usize</code> or <code>* -> vec</code>)</p><p>Search multiple things at once by splitting your query with comma (e.g. <code>str,u8</code> or <code>String,struct:Vec,test</code>)</p></div></div></aside><script>window.rootPath = "../../";window.currentCrate = "actix_web";</script><script src="../../aliases.js"></script><script src="../../main.js"></script><script defer src="../../search-index.js"></script></body></html>
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