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a125b2591d
Author: Fedor Katurov <gotham48@gmail.com>
Date: Thu Nov 10 14:33:09 2022 +0600
fixed appearance on mobile devices
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<head><title>Apollo Client Pagination • Obsidian Garden</title><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1"><meta name="description" content="Say, we have gql response like this and we wan't to have pagination with it. 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class="_link_192pu_66">MySQL And MariaDB Setup</a></div><div class="_row_192pu_24"><a href="/sql/postgress-setup" class="_link_192pu_66">Postgress Setup</a></div><!--]--></div></div></div><div class="_row_fvpir_25"><div class="_container_192pu_1"><div class="_heading_192pu_48">Typescript</div><div class="_children_192pu_86"><!--[--><div class="_row_192pu_24"><a href="/typescript/add-global-variable-to-window" class="_link_192pu_66">Add Global Variable To Window</a></div><div class="_row_192pu_24"><a href="/typescript/flatten-object-with-periods" class="_link_192pu_66">Flatten Object With Periods</a></div><div class="_row_192pu_24"><a href="/typescript/type-guards" class="_link_192pu_66">Type Guards</a></div><!--]--></div></div></div><!--]--></nav></div></div><div class="_main_4vjki_17"><div class="_content_4vjki_106"><div class="_wrapper_1km9a_1" hastransition="true"><div class="_content_1km9a_13"><button class="_theme_toggle_1km9a_23 _button_jz7in_1 _theme_toggle_1km9a_23"><span></span></button><!--[--><!--[--><main><!--[--><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-caf1a4">query</span><span class="ct-57ca2c"> </span><span class="ct-827d04">listItems</span><span class="ct-57ca2c">(</span></span><span class="line"><span class="ct-4a487d"> </span><span class="ct-61392d">filter</span><span class="ct-4a487d">: </span><span class="ct-34999c">Filter</span><span class="ct-4a487d">, </span></span><span class="line"><span class="ct-4a487d"> </span><span class="ct-61392d">sort</span><span class="ct-4a487d">: </span><span class="ct-34999c">String</span><span class="ct-4a487d">,</span></span><span class="line"><span class="ct-4a487d"> </span><span class="ct-61392d">limit</span><span class="ct-4a487d">: </span><span class="ct-34999c">Number</span><span class="ct-4a487d">,</span></span><span class="line"><span class="ct-4a487d"> </span><span class="ct-61392d">offset</span><span class="ct-4a487d">: </span><span class="ct-34999c">Number</span><span class="ct-4a487d">,</span></span><span class="line"><span class="ct-57ca2c">): </span><span class="ct-827d04">ItemList</span><span class="ct-57ca2c">!</span></span><span class="line"></span><span class="line"><span class="ct-caf1a4">input</span><span class="ct-57ca2c"> </span><span class="ct-8e972d">Filter</span><span class="ct-57ca2c"> {</span></span><span class="line"><span class="ct-4a487d"> </span><span class="ct-61392d">name</span><span class="ct-4a487d">: </span><span class="ct-34999c">String</span><span class="ct-607dcd">!</span></span><span class="line"><span class="ct-4a487d"> </span><span class="ct-61392d">type</span><span class="ct-4a487d">: </span><span class="ct-34999c">String</span><span class="ct-607dcd">!</span></span><span class="line"><span class="ct-57ca2c">}</span></span><span class="line"></span><span class="line"><span class="ct-caf1a4">type</span><span class="ct-57ca2c"> </span><span class="ct-8e972d">ItemList</span><span class="ct-57ca2c"> {</span></span><span class="line"><span class="ct-4a487d"> </span><span class="ct-61392d">items</span><span class="ct-4a487d">: [</span><span class="ct-34999c">Item</span><span class="ct-607dcd">!</span><span class="ct-4a487d">]</span><span class="ct-607dcd">!</span></span><span class="line"><span class="ct-4a487d"> </span><span class="ct-61392d">totalCount</span><span class="ct-4a487d">: </span><span class="ct-34999c">Int</span><span class="ct-607dcd">!</span></span><span class="line"><span class="ct-57ca2c">}</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-caf1a4">import</span><span class="ct-57ca2c"> { </span><span class="ct-f65462">ApolloClient</span><span class="ct-57ca2c">, </span><span class="ct-f65462">InMemoryCache</span><span class="ct-57ca2c"> } </span><span class="ct-caf1a4">from</span><span class="ct-57ca2c"> </span><span class="ct-5f4917">'@apollo/client'</span><span class="ct-57ca2c">;</span></span><span class="line"></span><span class="line"><span class="ct-22da4b">const</span><span class="ct-57ca2c"> </span><span class="ct-ee7923">client</span><span class="ct-57ca2c"> </span><span class="ct-caf1a4">=</span><span class="ct-57ca2c"> </span><span class="ct-caf1a4">new</span><span class="ct-57ca2c"> </span><span class="ct-827d04">ApolloClient</span><span class="ct-57ca2c">({</span></span><span class="line"><span class="ct-57ca2c"> </span><span class="ct-3cef97">// ...</span></span><span class="line"><span class="ct-57ca2c"> cache: </span><span class="ct-caf1a4">new</span><span class="ct-57ca2c"> </span><span class="ct-827d04">InMemoryCache</span><span class="ct-57ca2c">({ </span><span class="ct-f65462">typePolicies</span><span class="ct-57ca2c"> }),</span></span><span class="line"><span class="ct-57ca2c"> </span><span class="ct-3cef97">// ...</span></span><span class="line"><span class="ct-57ca2c">});</span></span><span class="line"></span><span class="line"><span class="ct-caf1a4">export</span><span class="ct-57ca2c"> </span><span class="ct-22da4b">const</span><span class="ct-57ca2c"> </span><span class="ct-ee7923">typePolicies</span><span class="ct-caf1a4">:</span><span class="ct-57ca2c"> </span><span class="ct-62a297">TypePolicies</span><span class="ct-57ca2c"> </span><span class="ct-caf1a4">=</span><span class="ct-57ca2c"> {</span></span><span class="line"><span class="ct-57ca2c"> Query: {</span></span><span class="line"><span class="ct-57ca2c"> fields: {</span></span><span class="line"><span class="ct-57ca2c"> </span><span class="ct-3cef97">// query name</span></span><span class="line"><span class="ct-57ca2c"> listItems: {</span></span><span class="line"><span class="ct-57ca2c"> </span><span class="ct-3cef97">// apollo will serialize and use keyArgs as unique</span></span><span class="line"><span class="ct-57ca2c"> </span><span class="ct-3cef97">// identifier in cache for every query</span></span><span class="line"><span class="ct-57ca2c"> </span><span class="ct-3cef97">// consider choosing the right fields, </span></span><span class="line"><span class="ct-57ca2c"> </span><span class="ct-3cef97">// i.e. limit and offset won't work here</span></span><span class="line"><span class="ct-57ca2c"> keyArgs: [</span></span><span class="line"><span class="ct-57ca2c"> </span><span class="ct-5f4917">'sort'</span><span class="ct-57ca2c">, </span><span class="ct-3cef97">// primitive type</span></span><span class="line"><span class="ct-57ca2c"> </span><span class="ct-5f4917">'filter'</span><span class="ct-57ca2c">, [</span><span class="ct-5f4917">'name'</span><span class="ct-57ca2c">, </span><span class="ct-5f4917">'type'</span><span class="ct-57ca2c">] </span><span class="ct-3cef97">// nested fields of `filter`</span></span><span class="line"><span class="ct-57ca2c"> ],</span></span><span class="line"><span class="ct-57ca2c"> merge: </span><span class="ct-f65462">mergeItemsWithTotalCount</span><span class="ct-57ca2c">,</span></span><span class="line"><span class="ct-57ca2c"> },</span></span><span class="line"><span class="ct-57ca2c"> }</span></span><span class="line"><span class="ct-57ca2c">}</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-3cef97">/** merges all sources with { items: unknown[], totalCount: number } */</span></span><span class="line"><span class="ct-822241">const</span><span class="ct-4a487d"> </span><span class="ct-d83b24">mergeItemsWithTotalCount</span><span class="ct-4a487d"> </span><span class="ct-607dcd">=</span><span class="ct-4a487d"> (</span><span class="ct-61392d">existing</span><span class="ct-4a487d">, </span><span class="ct-61392d">incoming</span><span class="ct-4a487d">, { </span><span class="ct-61392d">args</span><span class="ct-4a487d"> }) </span><span class="ct-822241">=></span><span class="ct-4a487d"> {</span></span><span class="line"><span class="ct-57ca2c"> </span><span class="ct-3cef97">// no existing data</span></span><span class="line"><span class="ct-57ca2c"> </span><span class="ct-caf1a4">if</span><span class="ct-57ca2c"> (</span><span class="ct-caf1a4">!</span><span class="ct-f65462">existing</span><span class="ct-57ca2c"> </span><span class="ct-caf1a4">||</span><span class="ct-57ca2c"> </span><span class="ct-caf1a4">!</span><span class="ct-f65462">args</span><span class="ct-57ca2c">?.</span><span class="ct-f65462">offset</span><span class="ct-57ca2c"> </span><span class="ct-caf1a4">||</span><span class="ct-57ca2c"> </span><span class="ct-f65462">args</span><span class="ct-57ca2c">.</span><span class="ct-f65462">offset</span><span class="ct-57ca2c"> </span><span class="ct-caf1a4"><</span><span class="ct-57ca2c"> </span><span class="ct-f65462">existing</span></span><span class="line"><span class="ct-57ca2c"> </span><span class="ct-caf1a4">return</span><span class="ct-57ca2c"> </span><span class="ct-f65462">incoming</span><span class="ct-57ca2c"> </span><span class="ct-caf1a4">||</span><span class="ct-57ca2c"> [];</span></span><span class="line"><span class="ct-57ca2c"> }</span></span><span class="line"></span><span class="line"><span class="ct-57ca2c"> </span><span class="ct-3cef97">// If hook was called multiple times</span></span><span class="line"><span class="ct-57ca2c"> </span><span class="ct-caf1a4">if</span><span class="ct-57ca2c"> (</span><span class="ct-f65462">existing</span><span class="ct-57ca2c">?.</span><span class="ct-f65462">items</span><span class="ct-57ca2c">?.</span></span><span class="line"><span class="ct-57ca2c"> </span><span class="ct-caf1a4">return</span><span class="ct-57ca2c"> </span><span class="ct-f65462">existing</span><span class="ct-57ca2c"> </span><span class="ct-caf1a4">||</span><span class="ct-57ca2c"> [];</span></span><span class="line"><span class="ct-57ca2c"> }</span></span><span class="line"></span><span class="line"><span class="ct-57ca2c"> </span><span class="ct-3cef97">// merge cache and incoming data</span></span><span class="line"><span class="ct-57ca2c"> </span><span class="ct-22da4b">const</span><span class="ct-57ca2c"> </span><span class="ct-ee7923">items</span><span class="ct-57ca2c"> </span><span class="ct-caf1a4">=</span><span class="ct-57ca2c"> [</span><span class="ct-caf1a4">...</span><span class="ct-57ca2c">(</span><span class="ct-f65462">existing</span><span class="ct-57ca2c">?.</span><span class="ct-f65462">items</span><span class="ct-57ca2c"> </span><span class="ct-caf1a4">||</span><span class="ct-57ca2c"> </span></span><span class="line"></span><span class="line"><span class="ct-57ca2c"> </span><span class="ct-3cef97">// apply latest result for totalCount</span></span><span class="line"><span class="ct-57ca2c"> </span><span class="ct-22da4b">const</span><span class="ct-57ca2c"> </span><span class="ct-ee7923">totalCount</span><span class="ct-57ca2c"> </span><span class="ct-caf1a4">=</span><span class="ct-57ca2c"> </span><span class="ct-f65462">incoming</span><span class="ct-57ca2c">?.</span><span class="ct-f65462">totalCount</span><span class="ct-57ca2c"> </span><span class="ct-caf1a4">||</span><span class="ct-57ca2c"> </span><span class="ct-f65462">existing</span><span class="ct-57ca2c">?.</span><span class="ct-f65462">totalCount</span><span class="ct-57ca2c">;</span></span><span class="line"></span><span class="line"><span class="ct-57ca2c"> </span><span class="ct-caf1a4">return</span><span class="ct-57ca2c"> {</span></span><span class="line"><span class="ct-57ca2c"> </span><span class="ct-caf1a4">...</span><span class="ct-57ca2c">(</span><span class="ct-f65462">incoming</span><span class="ct-57ca2c"> </span><span class="ct-caf1a4">||</span><span class="ct-57ca2c"> </span></span><span class="line"><span class="ct-57ca2c"> </span><span class="ct-f65462">items</span><span class="ct-57ca2c">,</span></span><span class="line"><span class="ct-57ca2c"> </span><span class="ct-f65462">totalCount</span><span class="ct-57ca2c">,</span></span><span class="line"><span class="ct-57ca2c"> };</span></span><span class="line"><span class="ct-57ca2c"> };</span></span></code></pre><!--]--></div><style>.ct-d83b24{color:#D2A8FF}.ct-822241{color:#FF7B72}.ct-62a297{color:#FFA657}.ct-3cef97{color:#8B949E}.ct-ee7923{color:#79C0FF}.ct-22da4b{color:#FF7B72}.ct-5f4917{color:#A5D6FF}.ct-f65462{color:#C9D1D9}.ct-607dcd{color:#FF7B72}.ct-8e972d{color:#79C0FF}.ct-34999c{color:#79C0FF}.ct-61392d{color:#FFA657}.ct-4a487d{color:#C9D1D9}.ct-827d04{color:#D2A8FF}.ct-57ca2c{color:#C9D1D9}.ct-caf1a4{color:#FF7B72}.light .ct-caf1a4{color:#859900}.light .ct-57ca2c{color:#657B83}.light .ct-827d04{color:#268BD2}.light .ct-4a487d{color:#657B83}.light .ct-61392d{color:#657B83}.light .ct-34999c{color:#859900}.light .ct-8e972d{color:#859900}.light .ct-607dcd{color:#859900}.light .ct-f65462{color:#268BD2}.light .ct-5f4917{color:#2AA198}.light .ct-22da4b{color:#073642}.light .ct-ee7923{color:#268BD2}.light .ct-3cef97{color:#93A1A1}.light .ct-62a297{color:#268BD2}.light .ct-822241{color:#073642}.light 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