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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 `upgrade` fn in crate `map_model`."><meta name="keywords" content="rust, rustlang, rust-lang, upgrade"><title>map_model::edits::compat::upgrade - 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><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../../favicon.svg">
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<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 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><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"><p class="location"><a href="../../index.html">map_model</a>::<wbr><a href="../index.html">edits</a>::<wbr><a href="index.html">compat</a></p><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"><img src="../../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><script src="../../../theme.js"></script><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" class="help-button">?</button>
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<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">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></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/map_model/edits/compat.rs.html#22-94" 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/1.0.62/serde_json/value/enum.Value.html" title="enum serde_json::value::Value">Value</a>, map: &<a class="struct" href="../../../map_model/struct.Map.html" title="struct map_model::Map">Map</a>) -> <a class="type" href="https://docs.rs/anyhow/1.0.38/anyhow/type.Result.html" title="type anyhow::Result">Result</a><<a class="struct" href="../../../map_model/edits/perma/struct.PermanentMapEdits.html" title="struct map_model::edits::perma::PermanentMapEdits">PermanentMapEdits</a>></pre><div class="docblock"><p>When the PermanentMapEdits format changes, add a transformation here to automatically convert
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edits written with the old format.</p>
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<p>This problem is often solved with something like protocol buffers, but the resulting proto
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usually winds up with permanent legacy fields, unless the changes are purely additive. For
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example, protobufs wouldn't have helped with the fix_intersection_ids problem. Explicit
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transformation is easier!</p>
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