abstreet/rustdoc/map_model/edits/compat/fn.upgrade.html
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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="When the PermanentMapEdits format changes, add a transformation here to automatically convert edits written with the old format."><meta name="keywords" content="rust, rustlang, rust-lang, upgrade"><title>upgrade in map_model::edits::compat - 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="../../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../../ayu.css" disabled ><script id="default-settings" ></script><script src="../../../storage.js"></script><script src="../../../crates.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><style type="text/css">#crate-search{background-image:url("../../../down-arrow.svg");}</style></head><body class="rustdoc fn"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu" role="button">&#9776;</div><a href='../../../map_model/index.html'><div class='logo-container rust-logo'><img src='../../../rust-logo.png' alt='logo'></div></a><div class="sidebar-elems"><h2 class="location">Other items in<br><a href="../../index.html">map_model</a>::<wbr><a href="../index.html">edits</a>::<wbr><a href="index.html">compat</a></h2><div id="sidebar-vars" data-name="upgrade" data-ty="fn" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="18" height="18" alt="Pick another theme!" src="../../../brush.svg"></button><div id="theme-choices" role="menu"></div></div><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input"name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press S to search, ? for more options…" type="search"></div><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../../../settings.html" title="settings"><img width="18" height="18" alt="Change settings" src="../../../wheel.svg"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><span class="in-band">Function <a href="../../index.html">map_model</a>::<wbr><a href="../index.html">edits</a>::<wbr><a href="index.html">compat</a>::<wbr><a class="fn" href="#">upgrade</a><button id="copy-path" onclick="copy_path(this)" title="copy path"><img src="../../../clipboard.svg" width="19" height="18" alt="Copy item import" title="Copy item import to clipboard"></button></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">&#x2212;</span>]</a></span><a class="srclink" href="../../../src/map_model/edits/compat.rs.html#23-116" title="goto source code">[src]</a></span></h1><pre class="rust fn">pub fn upgrade(value: <a class="enum" href="https://docs.rs/serde_json/1.0.64/serde_json/value/enum.Value.html" title="enum serde_json::value::Value">Value</a>, map: &amp;<a class="struct" href="../../struct.Map.html" title="struct map_model::Map">Map</a>) -&gt; <a class="type" href="https://docs.rs/anyhow/1.0.41/anyhow/type.Result.html" title="type anyhow::Result">Result</a>&lt;<a class="struct" href="../perma/struct.PermanentMapEdits.html" title="struct map_model::edits::perma::PermanentMapEdits">PermanentMapEdits</a>&gt;</pre><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>When the PermanentMapEdits format changes, add a transformation here to automatically convert
edits written with the old format.</p>
<p>This problem is often solved with something like protocol buffers, but the resulting proto
usually winds up with permanent legacy fields, unless the changes are purely additive. For
example, protobufs wouldnt have helped with the fix_intersection_ids problem. Explicit
transformation is easier!</p>
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