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- <h1 id="モジュール">モジュール</h1>
- <p>単一ステートツリーを使うため、アプリケーションの全ての状態は、一つの大きなストアオブジェクトに内包されます。しかしながら、アプリケーションが大きくなるにつれて、ストアオブジェクトは膨れ上がってきます。</p>
- <p>そのような場合に役立てるため Vuex ではストアを<strong>モジュール</strong>に分割できるようになっています。それぞれのモジュールは、モジュール自身の状態(state)、ミューテーション、アクション、ゲッター、モジュールさえも内包できます(モジュールをネストできます)- トップからボトムまでフラクタル構造です:</p>
- <pre class="language-"><code class="lang-js"><span class="token keyword">const</span> moduleA <span class="token operator">=</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 operator">...</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>
- actions<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>
- getters<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>
- <span class="token keyword">const</span> moduleB <span class="token operator">=</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 operator">...</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>
- actions<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>
- <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>
- modules<span class="token punctuation">:</span> <span class="token punctuation">{</span>
- a<span class="token punctuation">:</span> moduleA<span class="token punctuation">,</span>
- b<span class="token punctuation">:</span> moduleB
- <span class="token punctuation">}</span>
- <span class="token punctuation">}</span><span class="token punctuation">)</span>
- store<span class="token punctuation">.</span>state<span class="token punctuation">.</span>a <span class="token comment" spellcheck="true">// -> `moduleA` のステート</span>
- store<span class="token punctuation">.</span>state<span class="token punctuation">.</span>b <span class="token comment" spellcheck="true">// -> `moduleB` のステート</span>
- </code></pre>
- <h3 id="モジュールのローカルステート">モジュールのローカルステート</h3>
- <p>モジュールのミューテーションやゲッターの中では、渡される第1引数は<strong>モジュールのローカルステート</strong>です。</p>
- <pre class="language-"><code class="lang-js"><span class="token keyword">const</span> moduleA <span class="token operator">=</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">0</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">// `state` はモジュールのローカルステート</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>
- getters<span class="token punctuation">:</span> <span class="token punctuation">{</span>
- doubleCount <span class="token punctuation">(</span>state<span class="token punctuation">)</span> <span class="token punctuation">{</span>
- <span class="token keyword">return</span> state<span class="token punctuation">.</span>count <span class="token operator">*</span> <span class="token number">2</span>
- <span class="token punctuation">}</span>
- <span class="token punctuation">}</span>
- <span class="token punctuation">}</span>
- </code></pre>
- <p>同様に、モジュールのアクションの中では <code>context.state</code> はローカルステートにアクセスでき、ルートのステートは <code>context.rootState</code> でアクセスできます:</p>
- <pre class="language-"><code class="lang-js"><span class="token keyword">const</span> moduleA <span class="token operator">=</span> <span class="token punctuation">{</span>
- <span class="token comment" spellcheck="true">// ...</span>
- actions<span class="token punctuation">:</span> <span class="token punctuation">{</span>
- incrementIfOddOnRootSum <span class="token punctuation">(</span><span class="token punctuation">{</span> state<span class="token punctuation">,</span> commit<span class="token punctuation">,</span> rootState <span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
- <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token punctuation">(</span>state<span class="token punctuation">.</span>count <span class="token operator">+</span> rootState<span class="token punctuation">.</span>count<span class="token punctuation">)</span> <span class="token operator">%</span> <span class="token number">2</span> <span class="token operator">===</span> <span class="token number">1</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
- <span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">'increment'</span><span class="token punctuation">)</span>
- <span class="token punctuation">}</span>
- <span class="token punctuation">}</span>
- <span class="token punctuation">}</span>
- <span class="token punctuation">}</span>
- </code></pre>
- <p>また、モジュールのゲッターの中では、ルートのステートは第3引数でアクセスできます:</p>
- <pre class="language-"><code class="lang-js"><span class="token keyword">const</span> moduleA <span class="token operator">=</span> <span class="token punctuation">{</span>
- <span class="token comment" spellcheck="true">// ...</span>
- getters<span class="token punctuation">:</span> <span class="token punctuation">{</span>
- sumWithRootCount <span class="token punctuation">(</span>state<span class="token punctuation">,</span> getters<span class="token punctuation">,</span> rootState<span class="token punctuation">)</span> <span class="token punctuation">{</span>
- <span class="token keyword">return</span> state<span class="token punctuation">.</span>count <span class="token operator">+</span> rootState<span class="token punctuation">.</span>count
- <span class="token punctuation">}</span>
- <span class="token punctuation">}</span>
- <span class="token punctuation">}</span>
- </code></pre>
- <h3 id="名前空間">名前空間</h3>
- <p>デフォルトでは、アクション、ミューテーション、そしてゲッター内部のモジュールは<strong>グローバル名前空間</strong>の元で登録されます - これにより、複数のモジュールが同じミューテーション/アクションタイプに反応することができます。</p>
- <p>モジュールをより自己完結型にまた再利用可能なものにしたい場合は、それを <code>namespaced: true</code> によって名前空間に分けることができます。モジュールが登録されると、そのゲッター、アクション、およびミューテーションのすべてが、モジュールが登録されているパスに基づいて自動的に名前空間に入れられます。例えば:</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>
- modules<span class="token punctuation">:</span> <span class="token punctuation">{</span>
- account<span class="token punctuation">:</span> <span class="token punctuation">{</span>
- namespaced<span class="token punctuation">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
- <span class="token comment" spellcheck="true">// モジュールのアセット</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> <span class="token comment" spellcheck="true">// モジュールステートはすでにネストされており、名前空間のオプションによって影響を受けません</span>
- getters<span class="token punctuation">:</span> <span class="token punctuation">{</span>
- isAdmin <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token operator">...</span> <span class="token punctuation">}</span> <span class="token comment" spellcheck="true">// -> getters['account/isAdmin']</span>
- <span class="token punctuation">}</span><span class="token punctuation">,</span>
- actions<span class="token punctuation">:</span> <span class="token punctuation">{</span>
- login <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token operator">...</span> <span class="token punctuation">}</span> <span class="token comment" spellcheck="true">// -> dispatch('account/login')</span>
- <span class="token punctuation">}</span><span class="token punctuation">,</span>
- mutations<span class="token punctuation">:</span> <span class="token punctuation">{</span>
- login <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token operator">...</span> <span class="token punctuation">}</span> <span class="token comment" spellcheck="true">// -> commit('account/login')</span>
- <span class="token punctuation">}</span><span class="token punctuation">,</span>
- <span class="token comment" spellcheck="true">// ネストされたモジュール</span>
- modules<span class="token punctuation">:</span> <span class="token punctuation">{</span>
- <span class="token comment" spellcheck="true">// 親モジュールから名前空間を継承する</span>
- myPage<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>
- getters<span class="token punctuation">:</span> <span class="token punctuation">{</span>
- profile <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token operator">...</span> <span class="token punctuation">}</span> <span class="token comment" spellcheck="true">// -> getters['account/profile']</span>
- <span class="token punctuation">}</span>
- <span class="token punctuation">}</span><span class="token punctuation">,</span>
- <span class="token comment" spellcheck="true">// さらに名前空間をネストする</span>
- posts<span class="token punctuation">:</span> <span class="token punctuation">{</span>
- namespaced<span class="token punctuation">:</span> <span class="token boolean">true</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>
- getters<span class="token punctuation">:</span> <span class="token punctuation">{</span>
- popular <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token operator">...</span> <span class="token punctuation">}</span> <span class="token comment" spellcheck="true">// -> getters['account/posts/popular']</span>
- <span class="token punctuation">}</span>
- <span class="token punctuation">}</span>
- <span class="token punctuation">}</span>
- <span class="token punctuation">}</span>
- <span class="token punctuation">}</span>
- <span class="token punctuation">}</span><span class="token punctuation">)</span>
- </code></pre>
- <p>名前空間のゲッターとアクションは、ローカライズされた <code>getters</code>、<code>dispatch</code>、<code>commit</code> を受け取ります。言い換えれば、同じモジュールに接頭辞 (prefix) を書き込まずに、モジュールアセットを使用することができます。名前空間オプションの切り替えは、モジュール内のコードには影響しません。</p>
- <h4 id="名前空間付きモジュールでのグローバルアセットへのアクセス">名前空間付きモジュールでのグローバルアセットへのアクセス</h4>
- <p>グローバルステートとゲッターを使いたい場合、<code>rootState</code> と <code>rootGetters</code> はゲッター関数の第3引数と第4引数として渡され、アクション関数に渡される <code>context</code> オブジェクトのプロパティとしても公開されます。</p>
- <p>アクションをディスパッチするか、グローバル名前空間にミューテーションをコミットするには、<code>dispatch</code> と <code>commit</code> の3番目の引数として <code>{root: true}</code> を渡します。</p>
- <pre class="language-"><code class="lang-js">modules<span class="token punctuation">:</span> <span class="token punctuation">{</span>
- foo<span class="token punctuation">:</span> <span class="token punctuation">{</span>
- namespaced<span class="token punctuation">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
- getters<span class="token punctuation">:</span> <span class="token punctuation">{</span>
- <span class="token comment" spellcheck="true">// `getters` はこのモジュールのゲッターにローカライズされています</span>
- <span class="token comment" spellcheck="true">// ゲッターの第4引数経由で rootGetters を使うことができます</span>
- someGetter <span class="token punctuation">(</span>state<span class="token punctuation">,</span> getters<span class="token punctuation">,</span> rootState<span class="token punctuation">,</span> rootGetters<span class="token punctuation">)</span> <span class="token punctuation">{</span>
- getters<span class="token punctuation">.</span>someOtherGetter <span class="token comment" spellcheck="true">// -> 'foo/someOtherGetter'</span>
- rootGetters<span class="token punctuation">.</span>someOtherGetter <span class="token comment" spellcheck="true">// -> 'someOtherGetter'</span>
- <span class="token punctuation">}</span><span class="token punctuation">,</span>
- someOtherGetter<span class="token punctuation">:</span> state <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">{</span> <span class="token operator">...</span> <span class="token punctuation">}</span>
- <span class="token punctuation">}</span><span class="token punctuation">,</span>
- actions<span class="token punctuation">:</span> <span class="token punctuation">{</span>
- <span class="token comment" spellcheck="true">// ディスパッチとコミットもこのモジュール用にローカライズされています</span>
- <span class="token comment" spellcheck="true">// ルートディスパッチ/コミットの `root` オプションを受け入れます</span>
- someAction <span class="token punctuation">(</span><span class="token punctuation">{</span> dispatch<span class="token punctuation">,</span> commit<span class="token punctuation">,</span> getters<span class="token punctuation">,</span> rootGetters <span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
- getters<span class="token punctuation">.</span>someGetter <span class="token comment" spellcheck="true">// -> 'foo/someGetter'</span>
- rootGetters<span class="token punctuation">.</span>someGetter <span class="token comment" spellcheck="true">// -> 'someGetter'</span>
- <span class="token function">dispatch</span><span class="token punctuation">(</span><span class="token string">'someOtherAction'</span><span class="token punctuation">)</span> <span class="token comment" spellcheck="true">// -> 'foo/someOtherAction'</span>
- <span class="token function">dispatch</span><span class="token punctuation">(</span><span class="token string">'someOtherAction'</span><span class="token punctuation">,</span> <span class="token keyword">null</span><span class="token punctuation">,</span> <span class="token punctuation">{</span> root<span class="token punctuation">:</span> <span class="token boolean">true</span> <span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token comment" spellcheck="true">// -> 'someOtherAction'</span>
- <span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">'someMutation'</span><span class="token punctuation">)</span> <span class="token comment" spellcheck="true">// -> 'foo/someMutation'</span>
- <span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">'someMutation'</span><span class="token punctuation">,</span> <span class="token keyword">null</span><span class="token punctuation">,</span> <span class="token punctuation">{</span> root<span class="token punctuation">:</span> <span class="token boolean">true</span> <span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token comment" spellcheck="true">// -> 'someMutation'</span>
- <span class="token punctuation">}</span><span class="token punctuation">,</span>
- someOtherAction <span class="token punctuation">(</span>ctx<span class="token punctuation">,</span> payload<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>
- <span class="token punctuation">}</span>
- <span class="token punctuation">}</span>
- </code></pre>
- <h4 id="名前空間によるバインディングヘルパー">名前空間によるバインディングヘルパー</h4>
- <p><code>mapState</code>、<code>mapGetters</code>、<code>mapActions</code>、そして <code>mapMutations</code> ヘルパーを使って名前空間付きモジュールをコンポーネントにバインディングするとき、少し冗長になります:</p>
- <pre class="language-"><code class="lang-js">computed<span class="token punctuation">:</span> <span class="token punctuation">{</span>
- <span class="token operator">...</span><span class="token function">mapState</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
- a<span class="token punctuation">:</span> state <span class="token operator">=</span><span class="token operator">></span> state<span class="token punctuation">.</span>some<span class="token punctuation">.</span>nested<span class="token punctuation">.</span>module<span class="token punctuation">.</span>a<span class="token punctuation">,</span>
- b<span class="token punctuation">:</span> state <span class="token operator">=</span><span class="token operator">></span> state<span class="token punctuation">.</span>some<span class="token punctuation">.</span>nested<span class="token punctuation">.</span>module<span class="token punctuation">.</span>b
- <span class="token punctuation">}</span><span class="token punctuation">)</span>
- <span class="token punctuation">}</span><span class="token punctuation">,</span>
- methods<span class="token punctuation">:</span> <span class="token punctuation">{</span>
- <span class="token operator">...</span><span class="token function">mapActions</span><span class="token punctuation">(</span><span class="token punctuation">[</span>
- <span class="token string">'some/nested/module/foo'</span><span class="token punctuation">,</span>
- <span class="token string">'some/nested/module/bar'</span>
- <span class="token punctuation">]</span><span class="token punctuation">)</span>
- <span class="token punctuation">}</span>
- </code></pre>
- <p>このような場合は、第1引数としてモジュールの名前空間文字列をヘルパーに渡すことで、そのモジュールをコンテキストとして使用してすべてのバインディングを行うことができます。上記は次のように単純化できます。</p>
- <pre class="language-"><code class="lang-js">computed<span class="token punctuation">:</span> <span class="token punctuation">{</span>
- <span class="token operator">...</span><span class="token function">mapState</span><span class="token punctuation">(</span><span class="token string">'some/nested/module'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
- a<span class="token punctuation">:</span> state <span class="token operator">=</span><span class="token operator">></span> state<span class="token punctuation">.</span>a<span class="token punctuation">,</span>
- b<span class="token punctuation">:</span> state <span class="token operator">=</span><span class="token operator">></span> state<span class="token punctuation">.</span>b
- <span class="token punctuation">}</span><span class="token punctuation">)</span>
- <span class="token punctuation">}</span><span class="token punctuation">,</span>
- methods<span class="token punctuation">:</span> <span class="token punctuation">{</span>
- <span class="token operator">...</span><span class="token function">mapActions</span><span class="token punctuation">(</span><span class="token string">'some/nested/module'</span><span class="token punctuation">,</span> <span class="token punctuation">[</span>
- <span class="token string">'foo'</span><span class="token punctuation">,</span>
- <span class="token string">'bar'</span>
- <span class="token punctuation">]</span><span class="token punctuation">)</span>
- <span class="token punctuation">}</span>
- </code></pre>
- <p>さらに、<code>createNamespacedHelpers</code> を使用することによって名前空間付けされたヘルパーを作成できます。指定された名前空間の値にバインドされた新しいコンポーネントバインディングヘルパーを持つオブジェクトを返します:</p>
- <pre class="language-"><code class="lang-js"><span class="token keyword">import</span> <span class="token punctuation">{</span> createNamespacedHelpers <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'vuex'</span>
- <span class="token keyword">const</span> <span class="token punctuation">{</span> mapState<span class="token punctuation">,</span> mapActions <span class="token punctuation">}</span> <span class="token operator">=</span> <span class="token function">createNamespacedHelpers</span><span class="token punctuation">(</span><span class="token string">'some/nested/module'</span><span class="token punctuation">)</span>
- <span class="token keyword">export</span> <span class="token keyword">default</span> <span class="token punctuation">{</span>
- computed<span class="token punctuation">:</span> <span class="token punctuation">{</span>
- <span class="token comment" spellcheck="true">// `some/nested/module` を調べます</span>
- <span class="token operator">...</span><span class="token function">mapState</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
- a<span class="token punctuation">:</span> state <span class="token operator">=</span><span class="token operator">></span> state<span class="token punctuation">.</span>a<span class="token punctuation">,</span>
- b<span class="token punctuation">:</span> state <span class="token operator">=</span><span class="token operator">></span> state<span class="token punctuation">.</span>b
- <span class="token punctuation">}</span><span class="token punctuation">)</span>
- <span class="token punctuation">}</span><span class="token punctuation">,</span>
- methods<span class="token punctuation">:</span> <span class="token punctuation">{</span>
- <span class="token comment" spellcheck="true">// `some/nested/module` を調べます</span>
- <span class="token operator">...</span><span class="token function">mapActions</span><span class="token punctuation">(</span><span class="token punctuation">[</span>
- <span class="token string">'foo'</span><span class="token punctuation">,</span>
- <span class="token string">'bar'</span>
- <span class="token punctuation">]</span><span class="token punctuation">)</span>
- <span class="token punctuation">}</span>
- <span class="token punctuation">}</span>
- </code></pre>
- <h4 id="プラグイン開発者向けの注意事項">プラグイン開発者向けの注意事項</h4>
- <p>モジュールを提供する<a href="plugins.html">プラグイン</a>を作成し、ユーザーがそれらを Vuex ストアに追加できるようにすると、モジュールの予測できない名前空間が気になるかもしれません。あなたのモジュールは、プラグインユーザーが名前空間付きモジュールの元にモジュールを追加すると、その名前空間に属するようになります。この状況に適応するには、プラグインオプションを使用して名前空間の値を受け取る必要があります。</p>
- <pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// プラグインオプションで名前空間値を取得し、</span>
- <span class="token comment" spellcheck="true">// そして、Vuex プラグイン関数を返す</span>
- <span class="token keyword">export</span> <span class="token keyword">function</span> createPlugin <span class="token punctuation">(</span>options <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>
- <span class="token keyword">return</span> <span class="token keyword">function</span> <span class="token punctuation">(</span>store<span class="token punctuation">)</span> <span class="token punctuation">{</span>
- <span class="token comment" spellcheck="true">/// 名前空間をプラグインモジュールの型に追加する</span>
- <span class="token keyword">const</span> namespace <span class="token operator">=</span> options<span class="token punctuation">.</span>namespace <span class="token operator">||</span> <span class="token string">''</span>
- store<span class="token punctuation">.</span><span class="token function">dispatch</span><span class="token punctuation">(</span>namespace <span class="token operator">+</span> <span class="token string">'pluginAction'</span><span class="token punctuation">)</span>
- <span class="token punctuation">}</span>
- <span class="token punctuation">}</span>
- </code></pre>
- <h3 id="動的にモジュールを登録する">動的にモジュールを登録する</h3>
- <p>ストアが作られた<strong>後</strong>に <code>store.registerModule</code> メソッドを使って、モジュールを登録できます:</p>
- <pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// `myModule` モジュールを登録します</span>
- store<span class="token punctuation">.</span><span class="token function">registerModule</span><span class="token punctuation">(</span><span class="token string">'myModule'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
- <span class="token comment" spellcheck="true">// ...</span>
- <span class="token punctuation">}</span><span class="token punctuation">)</span>
- <span class="token comment" spellcheck="true">// ネストされた `nested/myModule` モジュールを登録します</span>
- store<span class="token punctuation">.</span><span class="token function">registerModule</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token string">'nested'</span><span class="token punctuation">,</span> <span class="token string">'myModule'</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
- <span class="token comment" spellcheck="true">// ...</span>
- <span class="token punctuation">}</span><span class="token punctuation">)</span>
- </code></pre>
- <p>モジュールのステートには <code>store.state.myModule</code> と <code>store.state.nested.myModule</code> でアクセスします。</p>
- <p>動的なモジュール登録があることで、他の Vue プラグインが、モジュールをアプリケーションのストアに付属させることで、状態の管理に Vuex を活用できます。例えば <a href="https://github.com/vuejs/vuex-router-sync" target="_blank"><code>vuex-router-sync</code></a> ライブラリは、動的に付属させたモジュール内部でアプリケーションのルーティングのステートを管理することで vue-router と vuex を統合しています。</p>
- <p><code>store.unregisterModule(moduleName)</code> を呼び出せば、動的に登録したモジュールを削除できます。ただしストア作成(store creation)の際に宣言された、静的なモジュールはこのメソッドで削除できないことに注意してください。</p>
- <p>サーバサイドレンダリングされたアプリケーションから状態を保持するなど、新しいモジュールを登録するときに、以前の状態を保持したい場合があります。<code>preserveState</code> オプション(<code>store.registerModule('a', module, { preserveState: true })</code>)でこれを実現できます。</p>
- <h3 id="モジュールの再利用">モジュールの再利用</h3>
- <p>時どき、モジュールの複数インスタンスを作成する必要があるかもしれません。例えば:</p>
- <ul>
- <li>同じモジュールを使用する複数のストアを作成する;</li>
- <li>同じストアに同じモジュールを複数回登録する</li>
- </ul>
- <p>モジュールの状態を宣言するために単純なオブジェクトを使用すると、その状態オブジェクトは参照によって共有され、変更時にクロスストア/モジュールの状態汚染を引き起こします。(例: <code>runInNewContext</code> オプションが <code>false</code> または <code>'once'</code> のとき、<a href="https://ssr.vuejs.org/ja/structure.html#ステートフルなシングルトンの回避" target="_blank">SSR ではステートフルなシングルトンは避けます</a>。)</p>
- <p>これは、実際には Vue コンポーネント内部の <code>data</code> と全く同じ問題です。従って解決策も同じです。モジュールの状態を宣言するために関数を使用してください (2.3.0 以降でサポートされます):</p>
- <pre class="language-"><code class="lang-js"><span class="token keyword">const</span> MyReusableModule <span class="token operator">=</span> <span class="token punctuation">{</span>
- state <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
- <span class="token keyword">return</span> <span class="token punctuation">{</span>
- foo<span class="token punctuation">:</span> <span class="token string">'bar'</span>
- <span class="token punctuation">}</span>
- <span class="token punctuation">}</span><span class="token punctuation">,</span>
- <span class="token comment" spellcheck="true">// ミューテーション、アクション、ゲッター...</span>
- <span class="token punctuation">}</span>
- </code></pre>
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