Have I misunderstood something or is this correct? When you execute a mutation, you modify back-end data. Let's assume you have a query and mutation like this. Let’s see how it can be done: As you see, there are a lot of things to wrap up just to handle very common use cases. This means for very little overhead developers get the above update function built automatically for any mutation they wish. # Updating a single existing entity. Yes, Apollo Client also lets you update local data in the cache with either direct cache writes or client resolvers. One cool thing about Apollo is that you can manually control the contents of the cache. The perfect solution! However, updating the author name would not have the same result as the previous one because we have no id field within the author. We’ll get back to this later. To update the cache, we will be using the update function again to modify the cache. Is there some tips to do that while I dont need to query all the tasks and find by ID the item I want to update. Hi, I have a GraphQL server that uses a very much interconnected model, so many items are composed of other items. The update option in the Mutation tag. The generatedOptions object returned then contains an update function which automatically does the deduplication we saw in a previous code example. Instead, you should update the cache using an update function in the options. Direct cache writes are typically used to write simple booleans or strings to the cache whereas client resolvers are for more complicated writes such as adding or removing data from a list. There's many ways to update the cache results after a mutation: Returning the id + fields so that Apollo automagically knows how to update the cache. writeQuery ({query: getTasks, data: {' allTasks ': allTasks}});} catch (e) {// We should always catch here, // as the cache may be empty or the query may fail}}); Offix helper does that now. As Dan Abramov wrote explained perfectly in his blog post: Keep in mind that both proxy.readQuery and proxy.writeQuery may throw errors independently. Think of it like a normal data store that you’d have in MobX or Redux. If yes this might help you: 12:35pm. I'm trying to update apollo's cache after mutating the list retrieved in another gql query. Let's assume you have a query and mutation like this. One cool thing about Apollo is that you can manually control the contents of the cache. 16371 views. If we use the basic "ToDo" app example and we want to add a newly created task to our cache, the code will look something like the following: Let's walk through this example and explain what is happening. Setting up GraphQL Server with Node.js. 5619 views. You want to update the Apollo cache after a mutation with the mutation result. Not really. modify ({id: cache. 2015 . October 9, 2017 / by Ben Awad. This is where the update prop required to update the cache. If order is not yet started the product should be added and then the quantity should be updated. graphql apollo. One thing I noticed after going through the code in more detail. If the mutation is only updating objects you already have in the cache (for example, editing existing fields), you don't need to do anything as Apollo Client will update the cache automatically. we included the article id in the mutation response, refresh the browser** after the mutation :D, directly access the local cache using the. graphql apollo. In all other cases, it’s better to use a mutation composition or Hook API. We also want to update the local cache once we've received a successful response from the mutation. Updating the cache. It tries to decouple the view from the caching layer by configuring the mutation’s result caching behavior through the Apollo’s update variable. Understanding Apollo Fetch Policies - Galen Corey - Medium by ghis. We have a (prebuilt) mutation named createTaskMutation, and our update function which accepts a cache object and also the returned data object from the result of our mutation. Apollo by macareux. You need to use a try/catch block: Otherwise, you should be damn sure that the query would be in the cache already. The second is the exact mutation response from the server. Indeed while using the Apollo Client updating the local cache becomes exponentially complicated when it needs to include multiple variables, include multiple queries or cover scenarios where Apollo’s in-place update may not be sufficient: It generally happens that after a mutation we want to update more than just one query. These cases are a little less trivial. I have a component with product details on which I can add product to the cart. What if it is a new object we have just created? DEV Community – A constructive and inclusive social network for software developers. Data can be updated after mutation by using "update" property. articles.filter(article => article.published)). This means we have a major mutation that confirms the form, and one element of this form contains one mutation. Updating the cache upon a mutation. In some instances, you may need to manipulate the cache directly, such as updating the store after a mutation. It also allows us to minimise the load on our server. Confusion on updating cache data after mutations (Apollo Client) Currently running with GraphQL on Apollo Client. If that data is also present in your Apollo Client cache, you might need to update your cache to reflect the result of the mutation.. Updating a single existing entity apollo-cache-inmemory is the recommended cache implementation for Apollo Client 2.0.InMemoryCache is a normalized data store that supports all of Apollo Client 1.0's features without the dependency on Redux.. We can read from and write to our cache to prevent having to execute our queries after our data is updated. We’ll implement this functionality by using Apollo’s caching data. Here’s how it looks, ... Add Change Book Mutation. This is a developer-friendly way to organise data. After the page renders, it needs to kick off a query to determine if the viewer is me and progressively disclose UI controls if it is. This function then attempts to do three things: Once this update function has run we will have our updated data locally in our cache. If we don't find the result of our mutation already in our cache then we can safely add it. Slack Clone Using GraphQL and React - Introduction. Instead of requiring this boilerplate with essentially the same basic three steps each time of read, append, write, I thought it would be a good idea to extract the logic to a separate helper package. This may happen when variables are built programmatically. To handle anything outside of basic cache updates, Apollo gives us the ability to provide our client with custom update functions. Apollo client will do that for you. Great writeup. Most of the examples you see, also in the official Apollo’s documentation, look like the following: That’s cool, but what happens if the query has not yet been fetched, so is not in your cache as you supposed? You want to push a new item inside an existing array and you don't want to refetch the query. However, it is good to keep in mind how that query will end in the cache and in what form. This is correct. query {yourArray {id. We can update the local cache after any request for immediate UI updates. What about when we introduce subscriptions or multiple queries that need to be updated? identify (moveItem. When performing a mutation with useMutation. In the above example, we see that the Apollo Client queries or modifies data from one of two places. The GraphQL server contains the endpoints for creating and reading data for a Vehicle entity. These two following queries are not considered the same and will be stored separately in the cache: This ends up with the same query stored twice in the cache with a different order of variables: Invoke again the same query with different props.size and you get an additional entry in the cache: Crazy, huh? 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