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07112d2a58
Author: Fedor Katurov <gotham48@gmail.com>
Date: Mon Nov 7 15:28:00 2022 +0600
fixed illustrations size and skin tone
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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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Commands</a></div><!--]--></div></div></div><div class="_row_fvpir_25"><div class="_container_192pu_1"><div class="_heading_192pu_48">Graphql</div><div class="_children_192pu_86"><!--[--><div class="_row_192pu_24"><a aria-current="page" href="/graphql/apollo-client-pagination" class="router-link-active _active_192pu_81 _link_192pu_66">Apollo Client Pagination</a></div><div class="_row_192pu_24"><a href="/graphql/refresh-token-in-apollo-client" class="_link_192pu_66">Refresh Token In Apollo Client</a></div><!--]--></div></div></div><div class="_row_fvpir_25"><div class="_container_192pu_1"><div class="_heading_192pu_48">Linux</div><div class="_children_192pu_86"><!--[--><div class="_row_192pu_24"><a href="/linux/gitea-for-git-hosting" class="_link_192pu_66">Gitea For Git Hosting</a></div><div class="_row_192pu_24"><a href="/linux/google-photos-alternative-with-photoprism" class="_link_192pu_66">Google Photos Alternative With Photoprism</a></div><div class="_row_192pu_24"><a href="/linux/resume-or-start-screen-session" class="_link_192pu_66">Resume Or Start Screen Session</a></div><div class="_row_192pu_24"><a href="/linux/rsync-file-with-ssh" class="_link_192pu_66">Rsync File With SSH</a></div><div class="_row_192pu_24"><a href="/linux/setting-up-nginx" class="_link_192pu_66">Setting Up NGINX</a></div><div class="_row_192pu_24"><a href="/linux/ssh" class="_link_192pu_66">SSH</a></div><!--]--></div></div></div><div class="_row_fvpir_25"><div class="_container_192pu_1"><div class="_heading_192pu_48">Sql</div><div class="_children_192pu_86"><!--[--><div class="_row_192pu_24"><a href="/sql/mysql-and-mariadb-setup" 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_bdvnl_17"><div class="_wrapper_1hfaq_1" hastransition="true"><div class="_content_1hfaq_7"><button class="_theme_toggle_1hfaq_28 _button_jz7in_1 _theme_toggle_1hfaq_28"><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-aeb03e">query</span><span class="ct-912659"> </span><span class="ct-7fa1a6">listItems</span><span class="ct-912659">(</span></span><span class="line"><span class="ct-5ee133"> </span><span class="ct-bd1313">filter</span><span class="ct-5ee133">: </span><span class="ct-1fd63d">Filter</span><span class="ct-5ee133">, </span></span><span class="line"><span class="ct-5ee133"> </span><span class="ct-bd1313">sort</span><span class="ct-5ee133">: </span><span class="ct-1fd63d">String</span><span class="ct-5ee133">,</span></span><span class="line"><span class="ct-5ee133"> </span><span class="ct-bd1313">limit</span><span class="ct-5ee133">: </span><span class="ct-1fd63d">Number</span><span class="ct-5ee133">,</span></span><span class="line"><span class="ct-5ee133"> </span><span class="ct-bd1313">offset</span><span class="ct-5ee133">: </span><span class="ct-1fd63d">Number</span><span class="ct-5ee133">,</span></span><span class="line"><span class="ct-912659">): </span><span class="ct-7fa1a6">ItemList</span><span class="ct-912659">!</span></span><span class="line"></span><span class="line"><span class="ct-aeb03e">input</span><span class="ct-912659"> </span><span class="ct-17feeb">Filter</span><span class="ct-912659"> {</span></span><span class="line"><span class="ct-5ee133"> </span><span class="ct-bd1313">name</span><span class="ct-5ee133">: </span><span class="ct-1fd63d">String</span><span class="ct-d6b457">!</span></span><span class="line"><span class="ct-5ee133"> </span><span class="ct-bd1313">type</span><span class="ct-5ee133">: </span><span class="ct-1fd63d">String</span><span class="ct-d6b457">!</span></span><span class="line"><span class="ct-912659">}</span></span><span class="line"></span><span class="line"><span class="ct-aeb03e">type</span><span class="ct-912659"> </span><span class="ct-17feeb">ItemList</span><span class="ct-912659"> {</span></span><span class="line"><span class="ct-5ee133"> </span><span class="ct-bd1313">items</span><span class="ct-5ee133">: [</span><span class="ct-1fd63d">Item</span><span class="ct-d6b457">!</span><span class="ct-5ee133">]</span><span class="ct-d6b457">!</span></span><span class="line"><span class="ct-5ee133"> </span><span class="ct-bd1313">totalCount</span><span class="ct-5ee133">: </span><span class="ct-1fd63d">Int</span><span class="ct-d6b457">!</span></span><span class="line"><span class="ct-912659">}</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-aeb03e">import</span><span class="ct-912659"> { </span><span class="ct-905c16">ApolloClient</span><span class="ct-912659">, </span><span class="ct-905c16">InMemoryCache</span><span class="ct-912659"> } </span><span class="ct-aeb03e">from</span><span class="ct-912659"> </span><span class="ct-009c3c">'@apollo/client'</span><span class="ct-912659">;</span></span><span class="line"></span><span class="line"><span class="ct-b63a22">const</span><span class="ct-912659"> </span><span class="ct-dbd2b0">client</span><span class="ct-912659"> </span><span class="ct-aeb03e">=</span><span class="ct-912659"> </span><span class="ct-aeb03e">new</span><span class="ct-912659"> </span><span class="ct-7fa1a6">ApolloClient</span><span class="ct-912659">({</span></span><span class="line"><span class="ct-912659"> </span><span class="ct-4ed952">// ...</span></span><span class="line"><span class="ct-912659"> cache: </span><span class="ct-aeb03e">new</span><span class="ct-912659"> </span><span class="ct-7fa1a6">InMemoryCache</span><span class="ct-912659">({ </span><span class="ct-905c16">typePolicies</span><span class="ct-912659"> }),</span></span><span class="line"><span class="ct-912659"> </span><span class="ct-4ed952">// ...</span></span><span class="line"><span class="ct-912659">});</span></span><span class="line"></span><span class="line"><span class="ct-aeb03e">export</span><span class="ct-912659"> </span><span class="ct-b63a22">const</span><span class="ct-912659"> </span><span class="ct-dbd2b0">typePolicies</span><span class="ct-aeb03e">:</span><span class="ct-912659"> </span><span class="ct-525383">TypePolicies</span><span class="ct-912659"> </span><span class="ct-aeb03e">=</span><span class="ct-912659"> {</span></span><span class="line"><span class="ct-912659"> Query: {</span></span><span class="line"><span class="ct-912659"> fields: {</span></span><span class="line"><span class="ct-912659"> </span><span class="ct-4ed952">// query name</span></span><span class="line"><span class="ct-912659"> listItems: {</span></span><span class="line"><span class="ct-912659"> </span><span class="ct-4ed952">// apollo will serialize and use keyArgs as unique</span></span><span class="line"><span class="ct-912659"> </span><span class="ct-4ed952">// identifier in cache for every query</span></span><span class="line"><span class="ct-912659"> </span><span class="ct-4ed952">// consider choosing the right fields, </span></span><span class="line"><span class="ct-912659"> </span><span class="ct-4ed952">// i.e. limit and offset won't work here</span></span><span class="line"><span class="ct-912659"> keyArgs: [</span></span><span class="line"><span class="ct-912659"> </span><span class="ct-009c3c">'sort'</span><span class="ct-912659">, </span><span class="ct-4ed952">// primitive type</span></span><span class="line"><span class="ct-912659"> </span><span class="ct-009c3c">'filter'</span><span class="ct-912659">, [</span><span class="ct-009c3c">'name'</span><span class="ct-912659">, </span><span class="ct-009c3c">'type'</span><span class="ct-912659">] </span><span class="ct-4ed952">// nested fields of `filter`</span></span><span class="line"><span class="ct-912659"> ],</span></span><span class="line"><span class="ct-912659"> merge: </span><span class="ct-905c16">mergeItemsWithTotalCount</span><span class="ct-912659">,</span></span><span class="line"><span class="ct-912659"> },</span></span><span class="line"><span class="ct-912659"> }</span></span><span class="line"><span class="ct-912659">}</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-4ed952">/** merges all sources with { items: unknown[], totalCount: number } */</span></span><span class="line"><span class="ct-062754">const</span><span class="ct-5ee133"> </span><span class="ct-c0b017">mergeItemsWithTotalCount</span><span class="ct-5ee133"> </span><span class="ct-d6b457">=</span><span class="ct-5ee133"> (</span><span class="ct-bd1313">existing</span><span class="ct-5ee133">, </span><span class="ct-bd1313">incoming</span><span class="ct-5ee133">, { </span><span class="ct-bd1313">args</span><span class="ct-5ee133"> }) </span><span class="ct-062754">=></span><span class="ct-5ee133"> {</span></span><span class="line"><span class="ct-912659"> </span><span class="ct-4ed952">// no existing data</span></span><span class="line"><span class="ct-912659"> </span><span class="ct-aeb03e">if</span><span class="ct-912659"> (</span><span class="ct-aeb03e">!</span><span class="ct-905c16">existing</span><span class="ct-912659"> </span><span class="ct-aeb03e">||</span><span class="ct-912659"> </span><span class="ct-aeb03e">!</span><span class="ct-905c16">args</span><span class="ct-912659">?.</span><span class="ct-905c16">offset</span><span class="ct-912659"> </span><span class="ct-aeb03e">||</span><span class="ct-912659"> </span><span class="ct-905c16">args</span><span class="ct-912659">.</span><span class="ct-905c16">offset</span><span class="ct-912659"> </span><span class="ct-aeb03e"><</span><span class="ct-912659"> </span><span class="ct-905c16">existing</span></span><span class="line"><span class="ct-912659"> </span><span class="ct-aeb03e">return</span><span class="ct-912659"> </span><span class="ct-905c16">incoming</span><span class="ct-912659"> </span><span class="ct-aeb03e">||</span><span class="ct-912659"> [];</span></span><span class="line"><span class="ct-912659"> }</span></span><span class="line"></span><span class="line"><span class="ct-912659"> </span><span class="ct-4ed952">// If hook was called multiple times</span></span><span class="line"><span class="ct-912659"> </span><span class="ct-aeb03e">if</span><span class="ct-912659"> (</span><span class="ct-905c16">existing</span><span class="ct-912659">?.</span><span class="ct-905c16">items</span><span class="ct-912659">?.</span></span><span class="line"><span class="ct-912659"> </span><span class="ct-aeb03e">return</span><span class="ct-912659"> </span><span class="ct-905c16">existing</span><span class="ct-912659"> </span><span class="ct-aeb03e">||</span><span class="ct-912659"> [];</span></span><span class="line"><span class="ct-912659"> }</span></span><span class="line"></span><span class="line"><span class="ct-912659"> </span><span class="ct-4ed952">// merge cache and incoming data</span></span><span class="line"><span class="ct-912659"> </span><span class="ct-b63a22">const</span><span class="ct-912659"> </span><span class="ct-dbd2b0">items</span><span class="ct-912659"> </span><span class="ct-aeb03e">=</span><span class="ct-912659"> [</span><span class="ct-aeb03e">...</span><span class="ct-912659">(</span><span class="ct-905c16">existing</span><span class="ct-912659">?.</span><span class="ct-905c16">items</span><span class="ct-912659"> </span><span class="ct-aeb03e">||</span><span class="ct-912659"> </span></span><span class="line"></span><span class="line"><span class="ct-912659"> </span><span class="ct-4ed952">// apply latest result for totalCount</span></span><span class="line"><span class="ct-912659"> </span><span class="ct-b63a22">const</span><span class="ct-912659"> </span><span class="ct-dbd2b0">totalCount</span><span class="ct-912659"> </span><span class="ct-aeb03e">=</span><span class="ct-912659"> </span><span class="ct-905c16">incoming</span><span class="ct-912659">?.</span><span class="ct-905c16">totalCount</span><span class="ct-912659"> </span><span class="ct-aeb03e">||</span><span class="ct-912659"> </span><span class="ct-905c16">existing</span><span class="ct-912659">?.</span><span class="ct-905c16">totalCount</span><span class="ct-912659">;</span></span><span class="line"></span><span class="line"><span class="ct-912659"> </span><span class="ct-aeb03e">return</span><span class="ct-912659"> {</span></span><span class="line"><span class="ct-912659"> </span><span class="ct-aeb03e">...</span><span class="ct-912659">(</span><span class="ct-905c16">incoming</span><span class="ct-912659"> </span><span class="ct-aeb03e">||</span><span class="ct-912659"> </span></span><span class="line"><span class="ct-912659"> </span><span class="ct-905c16">items</span><span class="ct-912659">,</span></span><span class="line"><span class="ct-912659"> </span><span class="ct-905c16">totalCount</span><span class="ct-912659">,</span></span><span class="line"><span class="ct-912659"> };</span></span><span class="line"><span class="ct-912659"> };</span></span></code></pre><!--]--></div><style>.ct-c0b017{color:#D2A8FF}.ct-062754{color:#FF7B72}.ct-525383{color:#FFA657}.ct-4ed952{color:#8B949E}.ct-dbd2b0{color:#79C0FF}.ct-b63a22{color:#FF7B72}.ct-009c3c{color:#A5D6FF}.ct-905c16{color:#C9D1D9}.ct-d6b457{color:#FF7B72}.ct-17feeb{color:#79C0FF}.ct-1fd63d{color:#79C0FF}.ct-bd1313{color:#FFA657}.ct-5ee133{color:#C9D1D9}.ct-7fa1a6{color:#D2A8FF}.ct-912659{color:#C9D1D9}.ct-aeb03e{color:#FF7B72}.light .ct-aeb03e{color:#859900}.light .ct-912659{color:#657B83}.light .ct-7fa1a6{color:#268BD2}.light .ct-5ee133{color:#657B83}.light .ct-bd1313{color:#657B83}.light .ct-1fd63d{color:#859900}.light .ct-17feeb{color:#859900}.light .ct-d6b457{color:#859900}.light .ct-905c16{color:#268BD2}.light .ct-009c3c{color:#2AA198}.light .ct-b63a22{color:#073642}.light .ct-dbd2b0{color:#268BD2}.light .ct-4ed952{color:#93A1A1}.light .ct-525383{color:#268BD2}.light .ct-062754{color:#073642}.light 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