Using this method adds another layer of complexity. - msusur/graphql-playground { "slug": "example" } GraphQL operations can be of two types, queries and mutations. Let us write a mutation to update the title of a blog post. Making all other cache updates You can use the GraphQL playground at localhost:4000/graphql to test the queries and mutations described in this post. Inside graphql mutations it is possible to upload files in graphql using a separate REST API. An experiment on microservices using Graphql queries and mutations. In this article, I'll introduce you to GraphQL mutation. Now let's start! Since we don’t have anything in our database, let’s do a mutation first. Mutations. We need to add a mutation property to our type definition and implement it in the resolvers. In REST, any request might end up causing some side-effects on the server, but by convention it's suggested that one doesn't use GET requests to modify data. If you open up the docs tab on the right side, you’ll see that GraphQL playground has pulled all the possible resolvers that our server supports. I showed you how to build a GraphQL server using the GraphQL .NET library and tested the API with some queries from the GraphQL playground. I am following Andrew Mead's tutorial on Gatsby and for some reason I am having trouble with passing query variables to the query via GraphQL playground. Let’s go back to GraphQL Playground and execute the following to start a subscription: The Star Wars example we’re using provides one mutation example (adding a review) and one subscription example (getting notified when a review is added). First of all, let's start with the login mutation. As far as I can tell, the query works on node, as the contents of the 'blog' are being populated. Now that we know how to do queries, implementing mutations seems like an easy task. The name of the mutation is addSong and takes in three arguments: a non-nullable string for title, a nullable boolean value for whether the song was a numberOne hit, and a non-nullable string for performerName.We can assume that the mutation adds this new song to a database. The process of designing mutations is described in the article on GraphQL mutations. Files have to be uploaded to REST first, then the resulting upload URL is passed in the GraphQL mutation. Here is my code for the Query Variables (bottom left in GQL playground). Notice that we're returning the Song type from this mutation.Song is defined in the schema as follows: Before you can successfully call the TimeLine Service from the GraphQL playground you must acquire an authentication token and configure the GraphQL Playground "HTTP HEADERS" tab (bottom of the playground interface) to pass it as a header with your calls to the TimeLine Service.. To configure the "HTTP HEADERS" area to properly pass your authentication token, configure it as follows: This is usually a slow process and there are two servers to … If you execute the UPDATE_TODO mutation using this component, the mutation returns both the id of the modified to-do item and the item's new type.Because Apollo Client caches entities by id, it knows how to automatically update the corresponding entity in its cache.The application's UI also updates immediately to reflect changes in the cache. It will look something like: https://example.us-west-2.aws.cloud.dgraph.io/graphql. The login mutation. Mutations# Most discussions of GraphQL focus on data fetching, but any complete data platform needs a way to modify server-side data as well. We will use the same example of a mutation, nevertheless, in this quick blog post we will focus only on our options for executing mutations and queries in GraphiQL. 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