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                                <h1 id="mutations">Mutations</h1>
<p>La seule fa&#xE7;on de vraiment modifier l&apos;&#xE9;tat dans un store Vuex est d&apos;acter une mutation. Les mutations Vuex sont tr&#xE8;s similaires aux &#xE9;v&#xE8;nements : chaque mutation a un <strong>type</strong> sous forme de chaine de caract&#xE8;res et un <strong>gestionnaire</strong>. La fonction de gestion est en charge de proc&#xE9;der aux v&#xE9;ritables modifications de l&apos;&#xE9;tat, et elle re&#xE7;oit l&apos;&#xE9;tat en premier argument :</p>
<pre class="language-"><code class="lang-js"><span class="token keyword">const</span> store <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Vuex<span class="token punctuation">.</span>Store</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
  state<span class="token punctuation">:</span> <span class="token punctuation">{</span>
    count<span class="token punctuation">:</span> <span class="token number">1</span>
  <span class="token punctuation">}</span><span class="token punctuation">,</span>
  mutations<span class="token punctuation">:</span> <span class="token punctuation">{</span>
    increment <span class="token punctuation">(</span>state<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token comment" spellcheck="true">// muter l&apos;&#xE9;tat</span>
      state<span class="token punctuation">.</span>count<span class="token operator">++</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre>
<p>Vous ne pouvez pas appeler directement un gestionnaire de mutation. Le parti-pris ici est proche de l&apos;abonnement &#xE0; un &#xE9;v&#xE8;nement : &#xAB; Lorsqu&apos;une mutation du type <code>increment</code> est d&#xE9;clench&#xE9;e, appelle ce gestionnaire. &#xBB; Pour invoquer un gestionnaire de mutation, il faut appeler <code>store.commit</code> avec son type :</p>
<pre class="language-"><code class="lang-js">store<span class="token punctuation">.</span><span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">&apos;increment&apos;</span><span class="token punctuation">)</span>
</code></pre>
<h3 id="acter-avec-un-argument-additionnel">Acter avec un argument additionnel</h3>
<p>Vous pouvez donner un argument additionnel (&#xAB; payload &#xBB;) &#xE0; la fonction <code>store.commit</code> lors de la mutation :</p>
<pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// ...</span>
mutations<span class="token punctuation">:</span> <span class="token punctuation">{</span>
  increment <span class="token punctuation">(</span>state<span class="token punctuation">,</span> n<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    state<span class="token punctuation">.</span>count <span class="token operator">+</span><span class="token operator">=</span> n
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<pre class="language-"><code class="lang-js">store<span class="token punctuation">.</span><span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">&apos;increment&apos;</span><span class="token punctuation">,</span> <span class="token number">10</span><span class="token punctuation">)</span>
</code></pre>
<p>Dans la plupart des cas, l&apos;argument additionnel devrait &#xEA;tre un objet, ainsi il peut contenir plusieurs champs, et les mutations enregistr&#xE9;es seront &#xE9;galement plus descriptives :</p>
<pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// ...</span>
mutations<span class="token punctuation">:</span> <span class="token punctuation">{</span>
  increment <span class="token punctuation">(</span>state<span class="token punctuation">,</span> payload<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    state<span class="token punctuation">.</span>count <span class="token operator">+</span><span class="token operator">=</span> payload<span class="token punctuation">.</span>amount
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<pre class="language-"><code class="lang-js">store<span class="token punctuation">.</span><span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">&apos;increment&apos;</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
  amount<span class="token punctuation">:</span> <span class="token number">10</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre>
<h3 id="acter-avec-un-objet">Acter avec un objet</h3>
<p>Une m&#xE9;thode alternative pour acter une mutation est d&apos;utiliser directement un objet qui a une propri&#xE9;t&#xE9; <code>type</code> :</p>
<pre class="language-"><code class="lang-js">store<span class="token punctuation">.</span><span class="token function">commit</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
  type<span class="token punctuation">:</span> <span class="token string">&apos;increment&apos;</span><span class="token punctuation">,</span>
  amount<span class="token punctuation">:</span> <span class="token number">10</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre>
<p>Lors de l&apos;utilisation d&apos;un objet pour acter, c&apos;est l&apos;objet lui-m&#xEA;me qui ferra office d&apos;argument pour aux gestionnaires de mutation, le gestionnaire reste donc inchang&#xE9; :</p>
<pre class="language-"><code class="lang-js">mutations<span class="token punctuation">:</span> <span class="token punctuation">{</span>
  increment <span class="token punctuation">(</span>state<span class="token punctuation">,</span> payload<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    state<span class="token punctuation">.</span>count <span class="token operator">+</span><span class="token operator">=</span> payload<span class="token punctuation">.</span>amount
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<h3 id="les-mutations-suivent-les-r&#xE8;gles-de-r&#xE9;activit&#xE9;-de-vue">Les mutations suivent les r&#xE8;gles de r&#xE9;activit&#xE9; de Vue</h3>
<p>Puisqu&apos;un &#xE9;tat de store de Vuex est rendu r&#xE9;actif par Vue, lorsque nous mutons l&apos;&#xE9;tat, les composants Vue observant cet &#xE9;tat seront automatiquement mis &#xE0; jour. Cela signifie &#xE9;galement que les mutations Vuex sont sujettes aux m&#xEA;mes limitations qu&apos;avec l&apos;utilisation de Vue seul :</p>
<ol>
<li><p>Initialisez de pr&#xE9;f&#xE9;rence le store initial de votre &#xE9;tat avec tous les champs d&#xE9;sir&#xE9;s auparavant.</p>
</li>
<li><p>Lorsque vous ajoutez de nouvelles propri&#xE9;t&#xE9;s &#xE0; un objet, vous devriez soit :</p>
<ul>
<li><p>Utiliser <code>Vue.set(obj, &apos;newProp&apos;, 123)</code>, ou</p>
</li>
<li><p>Remplacer cet objet par un nouvel objet. Par exemple, en utilisant <a href="https://developer.mozilla.org/fr/docs/Web/JavaScript/Reference/Op%C3%A9rateurs/Op%C3%A9rateur_de_d%C3%A9composition" target="_blank">op&#xE9;rateur de d&#xE9;composition</a> (stage-2), il est possible d&apos;&#xE9;crire :</p>
<pre class="language-"><code class="lang-js">state<span class="token punctuation">.</span>obj <span class="token operator">=</span> <span class="token punctuation">{</span> <span class="token operator">...</span>state<span class="token punctuation">.</span>obj<span class="token punctuation">,</span> newProp<span class="token punctuation">:</span> <span class="token number">123</span> <span class="token punctuation">}</span>
</code></pre>
</li>
</ul>
</li>
</ol>
<h3 id="utilisation-de-constante-pour-les-types-de-mutation">Utilisation de constante pour les types de mutation</h3>
<p>C&apos;est une fa&#xE7;on de faire r&#xE9;guli&#xE8;re que d&apos;utiliser des constantes pour les types de mutations dans diverses impl&#xE9;mentations de Flux. Cela permet au code de b&#xE9;n&#xE9;ficier d&apos;outils comme les linters (des outils d&apos;aide &#xE0; l&apos;analyse syntaxique), et &#xE9;crire toutes ces constantes dans un seul fichier permet &#xE0; vos collaborateurs d&apos;avoir un aper&#xE7;u de quelles mutations sont possibles dans toute l&apos;application :</p>
<pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// mutation-types.js</span>
<span class="token keyword">export</span> <span class="token keyword">const</span> SOME_MUTATION <span class="token operator">=</span> <span class="token string">&apos;SOME_MUTATION&apos;</span>
</code></pre>
<pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// store.js</span>
<span class="token keyword">import</span> Vuex <span class="token keyword">from</span> <span class="token string">&apos;vuex&apos;</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> SOME_MUTATION <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">&apos;./mutation-types&apos;</span>

<span class="token keyword">const</span> store <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Vuex<span class="token punctuation">.</span>Store</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
  state<span class="token punctuation">:</span> <span class="token punctuation">{</span> <span class="token operator">...</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>
  mutations<span class="token punctuation">:</span> <span class="token punctuation">{</span>
    <span class="token comment" spellcheck="true">// nous pouvons utiliser la fonctionnalit&#xE9; de nom de propri&#xE9;t&#xE9; calcul&#xE9;e</span>
    <span class="token comment" spellcheck="true">// pour utiliser une constante en tant que nom de fonction</span>
    <span class="token punctuation">[</span>SOME_MUTATION<span class="token punctuation">]</span> <span class="token punctuation">(</span>state<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token comment" spellcheck="true">// muter l&apos;&#xE9;tat</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre>
<p>Utiliser les constantes ou non rel&#xE8;ve de la pr&#xE9;f&#xE9;rence personnelle. Cela peut &#xEA;tre b&#xE9;n&#xE9;fique sur un gros projet avec beaucoup de d&#xE9;veloppeurs, mais c&apos;est totalement optionnel si vous n&apos;aimez pas cette pratique.</p>
<h3 id="les-mutations-doivent-&#xEA;tre-synchrones">Les mutations doivent &#xEA;tre synchrones</h3>
<p>Une r&#xE8;gle importante &#xE0; retenir est que <strong>les fonctions de gestion des mutations doivent &#xEA;tre synchrones</strong>. Pourquoi ? Consid&#xE9;rons l&apos;exemple suivant :</p>
<pre class="language-"><code class="lang-js">mutations<span class="token punctuation">:</span> <span class="token punctuation">{</span>
  someMutation <span class="token punctuation">(</span>state<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    api<span class="token punctuation">.</span><span class="token function">callAsyncMethod</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
      state<span class="token punctuation">.</span>count<span class="token operator">++</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>Maintenant imaginons que nous d&#xE9;boguons l&apos;application et que nous regardons dans les logs de mutation des outils de d&#xE9;veloppement (&#xAB; devtools &#xBB;). Pour chaque mutation enregistr&#xE9;e, le devtool aura besoin de capturer un instantan&#xE9; de l&apos;&#xE9;tat &#xAB; avant &#xBB; et un instantan&#xE9; &#xAB; apr&#xE8;s &#xBB;. Cependant, la fonction de rappel asynchrone de l&apos;exemple ci-dessus rend l&apos;op&#xE9;ration impossible : la fonction de rappel n&apos;est pas encore appel&#xE9;e lorsque la mutation est act&#xE9;e, et il n&apos;y a aucun moyen pour le devtool de savoir quand la fonction de rappel sera v&#xE9;ritablement appel&#xE9;e. Toute mutation d&apos;&#xE9;tat effectu&#xE9;e dans la fonction de rappel est essentiellement intra&#xE7;able !</p>
<h3 id="acter-des-mutations-dans-les-composants">Acter des mutations dans les composants</h3>
<p>Vous pouvez acter des mutations dans les composants avec <code>this.$store.commit(&apos;xxx&apos;)</code>, ou en utilisant la fonction utilitaire <code>mapMutations</code> qui attache les m&#xE9;thodes du composant aux appels de <code>store.commit</code> (n&#xE9;cessite l&apos;injection de <code>store</code> &#xE0; la racine) :</p>
<pre class="language-"><code class="lang-js"><span class="token keyword">import</span> <span class="token punctuation">{</span> mapMutations <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">&apos;vuex&apos;</span>

<span class="token keyword">export</span> <span class="token keyword">default</span> <span class="token punctuation">{</span>
  <span class="token comment" spellcheck="true">// ...</span>
  methods<span class="token punctuation">:</span> <span class="token punctuation">{</span>
    <span class="token operator">...</span><span class="token function">mapMutations</span><span class="token punctuation">(</span><span class="token punctuation">[</span>
      <span class="token string">&apos;increment&apos;</span> <span class="token comment" spellcheck="true">// attacher `this.increment()` &#xE0; `this.$store.commit(&apos;increment&apos;)`</span>

      <span class="token comment" spellcheck="true">// `mapMutations` supporte &#xE9;galement les param&#xE8;tres additionnels :</span>
      <span class="token string">&apos;incrementBy&apos;</span> <span class="token comment" spellcheck="true">// attacher `this.incrementBy(amount)` &#xE0; `this.$store.commit(&apos;incrementBy&apos;, amount)`</span>
    <span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token operator">...</span><span class="token function">mapMutations</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
      add<span class="token punctuation">:</span> <span class="token string">&apos;increment&apos;</span> <span class="token comment" spellcheck="true">// attacher `this.add()` &#xE0; `this.$store.commit(&apos;increment&apos;)`</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<h3 id="en-avant-vers-les-actions">En avant vers les actions</h3>
<p>L&apos;asynchronisme combin&#xE9; &#xE0; la mutation de l&apos;&#xE9;tat peut rendre votre programme tr&#xE8;s difficile &#xE0; comprendre. Par exemple, lorsque vous appelez deux m&#xE9;thodes avec toutes les deux des fonctions de rappel asynchrones qui changent l&apos;&#xE9;tat, comment savez-vous quelle fonction de rappel est appel&#xE9;e en premi&#xE8;re ? C&apos;est exactement la raison pour laquelle nous voulons s&#xE9;parer les deux concepts. Avec Vuex, <strong>les mutations sont des transactions synchrones</strong> :</p>
<pre class="language-"><code class="lang-js">store<span class="token punctuation">.</span><span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">&apos;increment&apos;</span><span class="token punctuation">)</span>
<span class="token comment" spellcheck="true">// n&apos;importe quel changement d&apos;&#xE9;tat de &#xAB; increment &#xBB; par mutation</span>
<span class="token comment" spellcheck="true">// devrait &#xEA;tre faite de mani&#xE8;re synchrone.</span>
</code></pre>
<p>Pour g&#xE9;rer les op&#xE9;rations asynchrones, tournons-nous vers les <a href="actions.html">Actions</a>.</p>

                                
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