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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="_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_16c5m_17"><div class="_content_16c5m_93"><div class="_wrapper_vom09_1" hastransition="true"><div class="_content_vom09_14"><button class="_theme_toggle_vom09_24 _button_jz7in_1 _theme_toggle_vom09_24"><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-ac9afb">query</span><span class="ct-7dafdd"> </span><span class="ct-bfd470">listItems</span><span class="ct-7dafdd">(</span></span><span class="line"><span class="ct-20ad43"> </span><span class="ct-89a0ce">filter</span><span class="ct-20ad43">: </span><span class="ct-e6f76e">Filter</span><span class="ct-20ad43">, </span></span><span class="line"><span class="ct-20ad43"> </span><span class="ct-89a0ce">sort</span><span class="ct-20ad43">: </span><span class="ct-e6f76e">String</span><span class="ct-20ad43">,</span></span><span class="line"><span class="ct-20ad43"> </span><span class="ct-89a0ce">limit</span><span class="ct-20ad43">: </span><span class="ct-e6f76e">Number</span><span class="ct-20ad43">,</span></span><span class="line"><span class="ct-20ad43"> </span><span class="ct-89a0ce">offset</span><span class="ct-20ad43">: </span><span class="ct-e6f76e">Number</span><span class="ct-20ad43">,</span></span><span class="line"><span class="ct-7dafdd">): </span><span class="ct-bfd470">ItemList</span><span class="ct-7dafdd">!</span></span><span class="line"></span><span class="line"><span class="ct-ac9afb">input</span><span class="ct-7dafdd"> </span><span class="ct-b9abb7">Filter</span><span class="ct-7dafdd"> {</span></span><span class="line"><span class="ct-20ad43"> </span><span class="ct-89a0ce">name</span><span class="ct-20ad43">: </span><span class="ct-e6f76e">String</span><span class="ct-904dbb">!</span></span><span class="line"><span class="ct-20ad43"> </span><span class="ct-89a0ce">type</span><span class="ct-20ad43">: </span><span class="ct-e6f76e">String</span><span class="ct-904dbb">!</span></span><span class="line"><span class="ct-7dafdd">}</span></span><span class="line"></span><span class="line"><span class="ct-ac9afb">type</span><span class="ct-7dafdd"> </span><span class="ct-b9abb7">ItemList</span><span class="ct-7dafdd"> {</span></span><span class="line"><span class="ct-20ad43"> </span><span class="ct-89a0ce">items</span><span class="ct-20ad43">: [</span><span class="ct-e6f76e">Item</span><span class="ct-904dbb">!</span><span class="ct-20ad43">]</span><span class="ct-904dbb">!</span></span><span class="line"><span class="ct-20ad43"> </span><span class="ct-89a0ce">totalCount</span><span class="ct-20ad43">: </span><span class="ct-e6f76e">Int</span><span class="ct-904dbb">!</span></span><span class="line"><span class="ct-7dafdd">}</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-ac9afb">import</span><span class="ct-7dafdd"> { </span><span class="ct-aa253b">ApolloClient</span><span class="ct-7dafdd">, </span><span class="ct-aa253b">InMemoryCache</span><span class="ct-7dafdd"> } </span><span class="ct-ac9afb">from</span><span class="ct-7dafdd"> </span><span class="ct-c275b5">'@apollo/client'</span><span class="ct-7dafdd">;</span></span><span class="line"></span><span class="line"><span class="ct-6561fc">const</span><span class="ct-7dafdd"> </span><span class="ct-3aa4d5">client</span><span class="ct-7dafdd"> </span><span class="ct-ac9afb">=</span><span class="ct-7dafdd"> </span><span class="ct-ac9afb">new</span><span class="ct-7dafdd"> </span><span class="ct-bfd470">ApolloClient</span><span class="ct-7dafdd">({</span></span><span class="line"><span class="ct-7dafdd"> </span><span class="ct-1476e6">// ...</span></span><span class="line"><span class="ct-7dafdd"> cache: </span><span class="ct-ac9afb">new</span><span class="ct-7dafdd"> </span><span class="ct-bfd470">InMemoryCache</span><span class="ct-7dafdd">({ </span><span class="ct-aa253b">typePolicies</span><span class="ct-7dafdd"> }),</span></span><span class="line"><span class="ct-7dafdd"> </span><span class="ct-1476e6">// ...</span></span><span class="line"><span class="ct-7dafdd">});</span></span><span class="line"></span><span class="line"><span class="ct-ac9afb">export</span><span class="ct-7dafdd"> </span><span class="ct-6561fc">const</span><span class="ct-7dafdd"> </span><span class="ct-3aa4d5">typePolicies</span><span class="ct-ac9afb">:</span><span class="ct-7dafdd"> </span><span class="ct-aa8127">TypePolicies</span><span class="ct-7dafdd"> </span><span class="ct-ac9afb">=</span><span class="ct-7dafdd"> {</span></span><span class="line"><span class="ct-7dafdd"> Query: {</span></span><span class="line"><span class="ct-7dafdd"> fields: {</span></span><span class="line"><span class="ct-7dafdd"> </span><span class="ct-1476e6">// query name</span></span><span class="line"><span class="ct-7dafdd"> listItems: {</span></span><span class="line"><span class="ct-7dafdd"> </span><span class="ct-1476e6">// apollo will serialize and use keyArgs as unique</span></span><span class="line"><span class="ct-7dafdd"> </span><span class="ct-1476e6">// identifier in cache for every query</span></span><span class="line"><span class="ct-7dafdd"> </span><span class="ct-1476e6">// consider choosing the right fields, </span></span><span class="line"><span class="ct-7dafdd"> </span><span class="ct-1476e6">// i.e. limit and offset won't work here</span></span><span class="line"><span class="ct-7dafdd"> keyArgs: [</span></span><span class="line"><span class="ct-7dafdd"> </span><span class="ct-c275b5">'sort'</span><span class="ct-7dafdd">, </span><span class="ct-1476e6">// primitive type</span></span><span class="line"><span class="ct-7dafdd"> </span><span class="ct-c275b5">'filter'</span><span class="ct-7dafdd">, [</span><span class="ct-c275b5">'name'</span><span class="ct-7dafdd">, </span><span class="ct-c275b5">'type'</span><span class="ct-7dafdd">] </span><span class="ct-1476e6">// nested fields of `filter`</span></span><span class="line"><span class="ct-7dafdd"> ],</span></span><span class="line"><span class="ct-7dafdd"> merge: </span><span class="ct-aa253b">mergeItemsWithTotalCount</span><span class="ct-7dafdd">,</span></span><span class="line"><span class="ct-7dafdd"> },</span></span><span class="line"><span class="ct-7dafdd"> }</span></span><span class="line"><span class="ct-7dafdd">}</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-1476e6">/** merges all sources with { items: unknown[], totalCount: number } */</span></span><span class="line"><span class="ct-b5872a">const</span><span class="ct-20ad43"> </span><span class="ct-6af47c">mergeItemsWithTotalCount</span><span class="ct-20ad43"> </span><span class="ct-904dbb">=</span><span class="ct-20ad43"> (</span><span class="ct-89a0ce">existing</span><span class="ct-20ad43">, </span><span class="ct-89a0ce">incoming</span><span class="ct-20ad43">, { </span><span class="ct-89a0ce">args</span><span class="ct-20ad43"> }) </span><span class="ct-b5872a">=></span><span class="ct-20ad43"> {</span></span><span class="line"><span class="ct-7dafdd"> </span><span class="ct-1476e6">// no existing data</span></span><span class="line"><span class="ct-7dafdd"> </span><span class="ct-ac9afb">if</span><span class="ct-7dafdd"> (</span><span class="ct-ac9afb">!</span><span class="ct-aa253b">existing</span><span class="ct-7dafdd"> </span><span class="ct-ac9afb">||</span><span class="ct-7dafdd"> </span><span class="ct-ac9afb">!</span><span class="ct-aa253b">args</span><span class="ct-7dafdd">?.</span><span class="ct-aa253b">offset</span><span class="ct-7dafdd"> </span><span class="ct-ac9afb">||</span><span class="ct-7dafdd"> </span><span class="ct-aa253b">args</span><span class="ct-7dafdd">.</span><span class="ct-aa253b">offset</span><span class="ct-7dafdd"> </span><span class="ct-ac9afb"><</span><span class="ct-7dafdd"> </span><span class="ct-aa253b">existing</span></span><span class="line"><span class="ct-7dafdd"> </span><span class="ct-ac9afb">return</span><span class="ct-7dafdd"> </span><span class="ct-aa253b">incoming</span><span class="ct-7dafdd"> </span><span class="ct-ac9afb">||</span><span class="ct-7dafdd"> [];</span></span><span class="line"><span class="ct-7dafdd"> }</span></span><span class="line"></span><span class="line"><span class="ct-7dafdd"> </span><span class="ct-1476e6">// If hook was called multiple times</span></span><span class="line"><span class="ct-7dafdd"> </span><span class="ct-ac9afb">if</span><span class="ct-7dafdd"> (</span><span class="ct-aa253b">existing</span><span class="ct-7dafdd">?.</span><span class="ct-aa253b">items</span><span class="ct-7dafdd">?.</span></span><span class="line"><span class="ct-7dafdd"> </span><span class="ct-ac9afb">return</span><span class="ct-7dafdd"> </span><span class="ct-aa253b">existing</span><span class="ct-7dafdd"> </span><span class="ct-ac9afb">||</span><span class="ct-7dafdd"> [];</span></span><span class="line"><span class="ct-7dafdd"> }</span></span><span class="line"></span><span class="line"><span class="ct-7dafdd"> </span><span class="ct-1476e6">// merge cache and incoming data</span></span><span class="line"><span class="ct-7dafdd"> </span><span class="ct-6561fc">const</span><span class="ct-7dafdd"> </span><span class="ct-3aa4d5">items</span><span class="ct-7dafdd"> </span><span class="ct-ac9afb">=</span><span class="ct-7dafdd"> [</span><span class="ct-ac9afb">...</span><span class="ct-7dafdd">(</span><span class="ct-aa253b">existing</span><span class="ct-7dafdd">?.</span><span class="ct-aa253b">items</span><span class="ct-7dafdd"> </span><span class="ct-ac9afb">||</span><span class="ct-7dafdd"> </span></span><span class="line"></span><span class="line"><span class="ct-7dafdd"> </span><span class="ct-1476e6">// apply latest result for totalCount</span></span><span class="line"><span class="ct-7dafdd"> </span><span class="ct-6561fc">const</span><span class="ct-7dafdd"> </span><span class="ct-3aa4d5">totalCount</span><span class="ct-7dafdd"> </span><span class="ct-ac9afb">=</span><span class="ct-7dafdd"> </span><span class="ct-aa253b">incoming</span><span class="ct-7dafdd">?.</span><span class="ct-aa253b">totalCount</span><span class="ct-7dafdd"> </span><span class="ct-ac9afb">||</span><span class="ct-7dafdd"> </span><span class="ct-aa253b">existing</span><span class="ct-7dafdd">?.</span><span class="ct-aa253b">totalCount</span><span class="ct-7dafdd">;</span></span><span class="line"></span><span class="line"><span class="ct-7dafdd"> </span><span class="ct-ac9afb">return</span><span class="ct-7dafdd"> {</span></span><span class="line"><span class="ct-7dafdd"> </span><span class="ct-ac9afb">...</span><span class="ct-7dafdd">(</span><span class="ct-aa253b">incoming</span><span class="ct-7dafdd"> </span><span class="ct-ac9afb">||</span><span class="ct-7dafdd"> </span></span><span class="line"><span class="ct-7dafdd"> </span><span class="ct-aa253b">items</span><span class="ct-7dafdd">,</span></span><span class="line"><span class="ct-7dafdd"> </span><span class="ct-aa253b">totalCount</span><span class="ct-7dafdd">,</span></span><span class="line"><span class="ct-7dafdd"> };</span></span><span class="line"><span class="ct-7dafdd"> };</span></span></code></pre><!--]--></div><style>.ct-6af47c{color:#D2A8FF}.ct-b5872a{color:#FF7B72}.ct-aa8127{color:#FFA657}.ct-1476e6{color:#8B949E}.ct-3aa4d5{color:#79C0FF}.ct-6561fc{color:#FF7B72}.ct-c275b5{color:#A5D6FF}.ct-aa253b{color:#C9D1D9}.ct-904dbb{color:#FF7B72}.ct-b9abb7{color:#79C0FF}.ct-e6f76e{color:#79C0FF}.ct-89a0ce{color:#FFA657}.ct-20ad43{color:#C9D1D9}.ct-bfd470{color:#D2A8FF}.ct-7dafdd{color:#C9D1D9}.ct-ac9afb{color:#FF7B72}.light .ct-ac9afb{color:#859900}.light .ct-7dafdd{color:#657B83}.light .ct-bfd470{color:#268BD2}.light .ct-20ad43{color:#657B83}.light .ct-89a0ce{color:#657B83}.light .ct-e6f76e{color:#859900}.light .ct-b9abb7{color:#859900}.light .ct-904dbb{color:#859900}.light .ct-aa253b{color:#268BD2}.light .ct-c275b5{color:#2AA198}.light .ct-6561fc{color:#073642}.light .ct-3aa4d5{color:#268BD2}.light .ct-1476e6{color:#93A1A1}.light .ct-aa8127{color:#268BD2}.light .ct-b5872a{color:#073642}.light 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