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7635e7e9c4
Author: Fedor Katurov <gotham48@gmail.com>
Date: Thu Nov 10 16:57:58 2022 +0600
fixed UIButtons
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_theme_toggle_1km9a_23"><span></span></button><!--[--><!--[--><main class="_content_1gz79_1"><!--[--><h1>Apollo Client Pagination</h1><article><div><p><!--[-->Say, we have <code><!--[-->gql<!--]--></code> response like this and we wan't to have pagination with it. Let's merge it as it specified in <a href="https://www.apollographql.com/docs/react/caching/cache-field-behavior/#the-merge-function" rel="nofollow" target="_blank"><!--[-->official documentation<!--]--></a><!--]--></p><div class="_wrapper_1pe7v_1"><button class="_language_1pe7v_9"><span class="_icon_1pe7v_5"><svg xmlns="http://www.w3.org/2000/svg" height="12" viewbox="0 0 24 24" width="12" fill="currentColor"><path d="M0 0h24v24H0z" fill="none"></path><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"></path></svg></span><span>graphql</span></button><!--[--><pre><code><span class="line"><span class="ct-442bef">query</span><span class="ct-3ff40f"> </span><span class="ct-d9ba7d">listItems</span><span class="ct-3ff40f">(</span></span><span class="line"><span class="ct-c2910e"> </span><span class="ct-2b3ada">filter</span><span class="ct-c2910e">: </span><span class="ct-7f01ad">Filter</span><span class="ct-c2910e">, </span></span><span class="line"><span class="ct-c2910e"> </span><span class="ct-2b3ada">sort</span><span class="ct-c2910e">: </span><span class="ct-7f01ad">String</span><span class="ct-c2910e">,</span></span><span class="line"><span class="ct-c2910e"> </span><span class="ct-2b3ada">limit</span><span class="ct-c2910e">: </span><span class="ct-7f01ad">Number</span><span class="ct-c2910e">,</span></span><span class="line"><span class="ct-c2910e"> </span><span class="ct-2b3ada">offset</span><span class="ct-c2910e">: </span><span class="ct-7f01ad">Number</span><span class="ct-c2910e">,</span></span><span class="line"><span class="ct-3ff40f">): </span><span class="ct-d9ba7d">ItemList</span><span class="ct-3ff40f">!</span></span><span class="line"></span><span class="line"><span class="ct-442bef">input</span><span class="ct-3ff40f"> </span><span class="ct-4b9c52">Filter</span><span class="ct-3ff40f"> {</span></span><span class="line"><span class="ct-c2910e"> </span><span class="ct-2b3ada">name</span><span class="ct-c2910e">: </span><span class="ct-7f01ad">String</span><span class="ct-24583e">!</span></span><span class="line"><span class="ct-c2910e"> </span><span class="ct-2b3ada">type</span><span class="ct-c2910e">: </span><span class="ct-7f01ad">String</span><span class="ct-24583e">!</span></span><span class="line"><span class="ct-3ff40f">}</span></span><span class="line"></span><span class="line"><span class="ct-442bef">type</span><span class="ct-3ff40f"> </span><span class="ct-4b9c52">ItemList</span><span class="ct-3ff40f"> {</span></span><span class="line"><span class="ct-c2910e"> </span><span class="ct-2b3ada">items</span><span class="ct-c2910e">: [</span><span class="ct-7f01ad">Item</span><span class="ct-24583e">!</span><span class="ct-c2910e">]</span><span class="ct-24583e">!</span></span><span class="line"><span class="ct-c2910e"> </span><span class="ct-2b3ada">totalCount</span><span class="ct-c2910e">: </span><span class="ct-7f01ad">Int</span><span class="ct-24583e">!</span></span><span class="line"><span class="ct-3ff40f">}</span></span></code></pre><!--]--></div><p><!--[-->We will setup <code><!--[-->ApolloClient<!--]--></code> with <code><!--[-->typePolicies<!--]--></code> to merge incoming data in cache:<!--]--></p><div class="_wrapper_1pe7v_1"><button class="_language_1pe7v_9"><span class="_icon_1pe7v_5"><svg xmlns="http://www.w3.org/2000/svg" height="12" viewbox="0 0 24 24" width="12" fill="currentColor"><path d="M0 0h24v24H0z" fill="none"></path><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"></path></svg></span><span>typescript</span></button><!--[--><pre><code><span class="line"><span class="ct-442bef">import</span><span class="ct-3ff40f"> { </span><span class="ct-c701b5">ApolloClient</span><span class="ct-3ff40f">, </span><span class="ct-c701b5">InMemoryCache</span><span class="ct-3ff40f"> } </span><span class="ct-442bef">from</span><span class="ct-3ff40f"> </span><span class="ct-828902">'@apollo/client'</span><span class="ct-3ff40f">;</span></span><span class="line"></span><span class="line"><span class="ct-4ffdbe">const</span><span class="ct-3ff40f"> </span><span class="ct-6e3261">client</span><span class="ct-3ff40f"> </span><span class="ct-442bef">=</span><span class="ct-3ff40f"> </span><span class="ct-442bef">new</span><span class="ct-3ff40f"> </span><span class="ct-d9ba7d">ApolloClient</span><span class="ct-3ff40f">({</span></span><span class="line"><span class="ct-3ff40f"> </span><span class="ct-0e12f8">// ...</span></span><span class="line"><span class="ct-3ff40f"> cache: </span><span class="ct-442bef">new</span><span class="ct-3ff40f"> </span><span class="ct-d9ba7d">InMemoryCache</span><span class="ct-3ff40f">({ </span><span class="ct-c701b5">typePolicies</span><span class="ct-3ff40f"> }),</span></span><span class="line"><span class="ct-3ff40f"> </span><span class="ct-0e12f8">// ...</span></span><span class="line"><span class="ct-3ff40f">});</span></span><span class="line"></span><span class="line"><span class="ct-442bef">export</span><span class="ct-3ff40f"> </span><span class="ct-4ffdbe">const</span><span class="ct-3ff40f"> </span><span class="ct-6e3261">typePolicies</span><span class="ct-442bef">:</span><span class="ct-3ff40f"> </span><span class="ct-58bdb8">TypePolicies</span><span class="ct-3ff40f"> </span><span class="ct-442bef">=</span><span class="ct-3ff40f"> {</span></span><span class="line"><span class="ct-3ff40f"> Query: {</span></span><span class="line"><span class="ct-3ff40f"> fields: {</span></span><span class="line"><span class="ct-3ff40f"> </span><span class="ct-0e12f8">// query name</span></span><span class="line"><span class="ct-3ff40f"> listItems: {</span></span><span class="line"><span class="ct-3ff40f"> </span><span class="ct-0e12f8">// apollo will serialize and use keyArgs as unique</span></span><span class="line"><span class="ct-3ff40f"> </span><span class="ct-0e12f8">// identifier in cache for every query</span></span><span class="line"><span class="ct-3ff40f"> </span><span class="ct-0e12f8">// consider choosing the right fields, </span></span><span class="line"><span class="ct-3ff40f"> </span><span class="ct-0e12f8">// i.e. limit and offset won't work here</span></span><span class="line"><span class="ct-3ff40f"> keyArgs: [</span></span><span class="line"><span class="ct-3ff40f"> </span><span class="ct-828902">'sort'</span><span class="ct-3ff40f">, </span><span class="ct-0e12f8">// primitive type</span></span><span class="line"><span class="ct-3ff40f"> </span><span class="ct-828902">'filter'</span><span class="ct-3ff40f">, [</span><span class="ct-828902">'name'</span><span class="ct-3ff40f">, </span><span class="ct-828902">'type'</span><span class="ct-3ff40f">] </span><span class="ct-0e12f8">// nested fields of `filter`</span></span><span class="line"><span class="ct-3ff40f"> ],</span></span><span class="line"><span class="ct-3ff40f"> merge: </span><span class="ct-c701b5">mergeItemsWithTotalCount</span><span class="ct-3ff40f">,</span></span><span class="line"><span class="ct-3ff40f"> },</span></span><span class="line"><span class="ct-3ff40f"> }</span></span><span class="line"><span class="ct-3ff40f">}</span></span></code></pre><!--]--></div><p><!--[-->We will need merge function <code><!--[-->mergeItemsWithTotalCount<!--]--></code>, which will join results of query and cached data for specific key:<!--]--></p><div class="_wrapper_1pe7v_1"><button class="_language_1pe7v_9"><span class="_icon_1pe7v_5"><svg xmlns="http://www.w3.org/2000/svg" height="12" viewbox="0 0 24 24" width="12" fill="currentColor"><path d="M0 0h24v24H0z" fill="none"></path><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"></path></svg></span><span>typescript</span></button><!--[--><pre><code><span class="line"><span class="ct-0e12f8">/** merges all sources with { items: unknown[], totalCount: number } */</span></span><span class="line"><span class="ct-c056a1">const</span><span class="ct-c2910e"> </span><span class="ct-b4c75c">mergeItemsWithTotalCount</span><span class="ct-c2910e"> </span><span class="ct-24583e">=</span><span class="ct-c2910e"> (</span><span class="ct-2b3ada">existing</span><span class="ct-c2910e">, </span><span class="ct-2b3ada">incoming</span><span class="ct-c2910e">, { </span><span class="ct-2b3ada">args</span><span class="ct-c2910e"> }) </span><span class="ct-c056a1">=></span><span class="ct-c2910e"> {</span></span><span class="line"><span class="ct-3ff40f"> </span><span class="ct-0e12f8">// no existing data</span></span><span class="line"><span class="ct-3ff40f"> </span><span class="ct-442bef">if</span><span class="ct-3ff40f"> (</span><span class="ct-442bef">!</span><span class="ct-c701b5">existing</span><span class="ct-3ff40f"> </span><span class="ct-442bef">||</span><span class="ct-3ff40f"> </span><span class="ct-442bef">!</span><span class="ct-c701b5">args</span><span class="ct-3ff40f">?.</span><span class="ct-c701b5">offset</span><span class="ct-3ff40f"> </span><span class="ct-442bef">||</span><span class="ct-3ff40f"> </span><span class="ct-c701b5">args</span><span class="ct-3ff40f">.</span><span class="ct-c701b5">offset</span><span class="ct-3ff40f"> </span><span class="ct-442bef"><</span><span class="ct-3ff40f"> </span><span class="ct-c701b5">existing</span></span><span class="line"><span class="ct-3ff40f"> </span><span class="ct-442bef">return</span><span class="ct-3ff40f"> </span><span class="ct-c701b5">incoming</span><span class="ct-3ff40f"> </span><span class="ct-442bef">||</span><span class="ct-3ff40f"> [];</span></span><span class="line"><span class="ct-3ff40f"> }</span></span><span class="line"></span><span class="line"><span class="ct-3ff40f"> </span><span class="ct-0e12f8">// If hook was called multiple times</span></span><span class="line"><span class="ct-3ff40f"> </span><span class="ct-442bef">if</span><span class="ct-3ff40f"> (</span><span class="ct-c701b5">existing</span><span class="ct-3ff40f">?.</span><span class="ct-c701b5">items</span><span class="ct-3ff40f">?.</span></span><span class="line"><span class="ct-3ff40f"> </span><span class="ct-442bef">return</span><span class="ct-3ff40f"> </span><span class="ct-c701b5">existing</span><span class="ct-3ff40f"> </span><span class="ct-442bef">||</span><span class="ct-3ff40f"> [];</span></span><span class="line"><span class="ct-3ff40f"> }</span></span><span class="line"></span><span class="line"><span class="ct-3ff40f"> </span><span class="ct-0e12f8">// merge cache and incoming data</span></span><span class="line"><span class="ct-3ff40f"> </span><span class="ct-4ffdbe">const</span><span class="ct-3ff40f"> </span><span class="ct-6e3261">items</span><span class="ct-3ff40f"> </span><span class="ct-442bef">=</span><span class="ct-3ff40f"> [</span><span class="ct-442bef">...</span><span class="ct-3ff40f">(</span><span class="ct-c701b5">existing</span><span class="ct-3ff40f">?.</span><span class="ct-c701b5">items</span><span class="ct-3ff40f"> </span><span class="ct-442bef">||</span><span class="ct-3ff40f"> </span></span><span class="line"></span><span class="line"><span class="ct-3ff40f"> </span><span class="ct-0e12f8">// apply latest result for totalCount</span></span><span class="line"><span class="ct-3ff40f"> </span><span class="ct-4ffdbe">const</span><span class="ct-3ff40f"> </span><span class="ct-6e3261">totalCount</span><span class="ct-3ff40f"> </span><span class="ct-442bef">=</span><span class="ct-3ff40f"> </span><span class="ct-c701b5">incoming</span><span class="ct-3ff40f">?.</span><span class="ct-c701b5">totalCount</span><span class="ct-3ff40f"> </span><span class="ct-442bef">||</span><span class="ct-3ff40f"> </span><span class="ct-c701b5">existing</span><span class="ct-3ff40f">?.</span><span class="ct-c701b5">totalCount</span><span class="ct-3ff40f">;</span></span><span class="line"></span><span class="line"><span class="ct-3ff40f"> </span><span class="ct-442bef">return</span><span class="ct-3ff40f"> {</span></span><span class="line"><span class="ct-3ff40f"> </span><span class="ct-442bef">...</span><span class="ct-3ff40f">(</span><span class="ct-c701b5">incoming</span><span class="ct-3ff40f"> </span><span class="ct-442bef">||</span><span class="ct-3ff40f"> </span></span><span class="line"><span class="ct-3ff40f"> </span><span class="ct-c701b5">items</span><span class="ct-3ff40f">,</span></span><span class="line"><span class="ct-3ff40f"> </span><span class="ct-c701b5">totalCount</span><span class="ct-3ff40f">,</span></span><span class="line"><span class="ct-3ff40f"> };</span></span><span class="line"><span class="ct-3ff40f"> };</span></span></code></pre><!--]--></div><style>.ct-b4c75c{color:#D2A8FF}.ct-c056a1{color:#FF7B72}.ct-58bdb8{color:#FFA657}.ct-0e12f8{color:#8B949E}.ct-6e3261{color:#79C0FF}.ct-4ffdbe{color:#FF7B72}.ct-828902{color:#A5D6FF}.ct-c701b5{color:#C9D1D9}.ct-24583e{color:#FF7B72}.ct-4b9c52{color:#79C0FF}.ct-7f01ad{color:#79C0FF}.ct-2b3ada{color:#FFA657}.ct-c2910e{color:#C9D1D9}.ct-d9ba7d{color:#D2A8FF}.ct-3ff40f{color:#C9D1D9}.ct-442bef{color:#FF7B72}.light .ct-442bef{color:#859900}.light .ct-3ff40f{color:#657B83}.light .ct-d9ba7d{color:#268BD2}.light .ct-c2910e{color:#657B83}.light .ct-2b3ada{color:#657B83}.light .ct-7f01ad{color:#859900}.light .ct-4b9c52{color:#859900}.light .ct-24583e{color:#859900}.light .ct-c701b5{color:#268BD2}.light .ct-828902{color:#2AA198}.light .ct-4ffdbe{color:#073642}.light .ct-6e3261{color:#268BD2}.light .ct-0e12f8{color:#93A1A1}.light .ct-58bdb8{color:#268BD2}.light .ct-c056a1{color:#073642}.light 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