180 lines
9.1 KiB
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180 lines
9.1 KiB
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<section id='main' class="content">
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<h1 class='fqn'><span class='in-band'>Function <a href='index.html'>serde_json</a>::<wbr><a class="fn" href=''>to_value</a></span><span class='out-of-band'><span id='render-detail'>
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[<span class='inner'>−</span>]
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</a>
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</span><a class='srclink' href='../src/serde_json/value/mod.rs.html#1078-1083' title='goto source code'>[src]</a></span></h1>
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<pre class='rust fn'>pub fn to_value<T>(value: T) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="enum" href="../serde_json/value/enum.Value.html" title="enum serde_json::value::Value">Value</a>, <a class="struct" href="../serde_json/error/struct.Error.html" title="struct serde_json::error::Error">Error</a>> <span class="where fmt-newline">where<br> T: <a class="trait" href="../serde/ser/trait.Serialize.html" title="trait serde::ser::Serialize">Serialize</a>, </span></pre><div class='docblock'><p>Convert a <code>T</code> into <code>serde_json::Value</code> which is an enum that can represent
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any valid JSON data.</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">serde</span>;
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<span class="attribute">#[<span class="ident">macro_use</span>]</span>
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<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">serde_derive</span>;
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<span class="attribute">#[<span class="ident">macro_use</span>]</span>
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<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">serde_json</span>;
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">error</span>::<span class="ident">Error</span>;
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<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Serialize</span>)]</span>
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<span class="kw">struct</span> <span class="ident">User</span> {
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<span class="ident">fingerprint</span>: <span class="ident">String</span>,
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<span class="ident">location</span>: <span class="ident">String</span>,
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}
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<span class="kw">fn</span> <span class="ident">compare_json_values</span>() <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">Box</span><span class="op"><</span><span class="ident">Error</span><span class="op">>></span> {
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<span class="kw">let</span> <span class="ident">u</span> <span class="op">=</span> <span class="ident">User</span> {
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<span class="ident">fingerprint</span>: <span class="string">"0xF9BA143B95FF6D82"</span>.<span class="ident">to_owned</span>(),
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<span class="ident">location</span>: <span class="string">"Menlo Park, CA"</span>.<span class="ident">to_owned</span>(),
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};
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<span class="comment">// The type of `expected` is `serde_json::Value`</span>
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<span class="kw">let</span> <span class="ident">expected</span> <span class="op">=</span> <span class="macro">json</span><span class="macro">!</span>({
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<span class="string">"fingerprint"</span>: <span class="string">"0xF9BA143B95FF6D82"</span>,
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<span class="string">"location"</span>: <span class="string">"Menlo Park, CA"</span>,
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});
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<span class="kw">let</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">serde_json</span>::<span class="ident">to_value</span>(<span class="ident">u</span>).<span class="ident">unwrap</span>();
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="ident">expected</span>);
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<span class="prelude-val">Ok</span>(())
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}</pre>
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<h1 id="errors" class="section-header"><a href="#errors">Errors</a></h1>
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<p>This conversion can fail if <code>T</code>'s implementation of <code>Serialize</code> decides to
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fail, or if <code>T</code> contains a map with non-string keys.</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">serde_json</span>;
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">BTreeMap</span>;
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<span class="kw">fn</span> <span class="ident">main</span>() {
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<span class="comment">// The keys in this map are vectors, not strings.</span>
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">map</span> <span class="op">=</span> <span class="ident">BTreeMap</span>::<span class="ident">new</span>();
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<span class="ident">map</span>.<span class="ident">insert</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="number">32</span>, <span class="number">64</span>], <span class="string">"x86"</span>);
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<span class="macro">println</span><span class="macro">!</span>(<span class="string">"{}"</span>, <span class="ident">serde_json</span>::<span class="ident">to_value</span>(<span class="ident">map</span>).<span class="ident">unwrap_err</span>());
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}</pre>
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