Apollo Watchquery Vs Query. The Apollo service exposes two primary methods for executing GraphQL

The Apollo service exposes two primary methods for executing GraphQL queries: watchQuery () and query (). Both accept a query document (parsed with gql) and options, but Overview query and watchQuery are the two primary methods for fetching data from GraphQL back-end in Apollo Orbit, with slightly different behaviours. Learn how to use Apollo to attach GraphQL query results to your Angular UI with standard GraphQL queries. Using the watchQuery method. watchQuery method. In either case, the operation is a simple string that a GraphQL server can parse and respond The only difference between query and watchQuery is that watchQuery updates when the client-side cache is updated by a mutation Note that this method is not an implementation of GraphQL subscriptions. const defaultOptions = { watchQuery: { fetchPolicy: 'cache-and-network', errorPolicy: 'ignore', }, query: { fetchPolicy In theory, you could refetch every active query after a client-side update, but you can save time and network bandwidth by refetching queries more Apollo-client by default caches our queries and re-runing the same query will of course return the results from cache not from the server. Observables Behind the scenes useQuery is using Apollo’s watchQuery function. query on the list component then there is no additional hit to the server. Updating the Although Apollo Client can use your GraphQLWsLink to execute all operation types, in most cases it should continue using HTTP for queries and Queries: We will use Apollo to attach GraphQL query results to our Angular UI elements, we will use Apollo. Cache the results and use QueryRef to manage the watched query. useQuery Here’s where Apollo Angular shines like a polished gem. This The only difference between query and watchQuery is that watchQuery updates when the client-side cache is updated by a mutation Now if another operation updates this query's cached fields, our UI renders with the same logic it used when the query first returned. How is the logic and difference of the watchQuery and query. (Recommended) query method To execute a query within an Angular component, inject Apollo and pass it a GraphQL query document. . Using the query method. It’s based on the What is watchQuery? watchQuery is something you constantly keep a watch on query, whenever that query will be refetched or the data related to that query is changed from anywhere else, If I use apollo. This function ‘watches’ the portion of the Apollo Apollo Angular is a popular open-source library that allows you to build a data layer for your web or mobile app. Request Data Once all is hooked up, you’re ready to start requesting data with Apollo service! The Apollo is an Angular service exported from apollo-angular to share GraphQL data with your UI. With Apollo Client, you can send queries in 2 different ways. However, I want to use watchQuery for the list but without this side effect. For a full documentation of queries, As a result of the watchQuery method, we get a QueryRef object with a valueChanges property. query is something you just query for once, you can consider it as an equivalent of GET. Naturally, because I did a mutation to Real-Time Data? Meet watchQuery and Apollo. Rather, it uses Apollo's store in order to reactively deliver updates to your In apollo-angular, valueChanges returns type Observable from rxjs (link to source). Apollo Angular introduces a new approach of working with GraphQL in Angular by providing Query, Mutation and Subscription APIs. You can either go full reactive with RxJS or stick with the Without using the readQuery and writeQuery, when running the watchQuery again, even with different variables to run the query will return the same data from the cache. When your component renders, watchQuery observable emits a QueryResult For example, suppose you call watchQuery on a GraphQL query that fetches a person's first and last name and this person has a particular object A GraphQL query is used to read or fetch values while a mutation is used to write or post values. I'm setting up Apollo Client like this. However, if you Go to Definition on the Observable declared in your service, it takes you to Become acquainted with GraphQL and take notes on how to use it with Apollo Angular, one of the most popular GraphQL clients for Angular. We need to parse our query into a GraphQL Request Data Once all is hooked up, you’re ready to start requesting data with Apollo service! The Apollo is an Angular service exported from apollo-angular to share GraphQL data with your UI.

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