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. We define the Query, Mutation and User GraphQL … Now let's start! The process of designing mutations is described in the article on GraphQL mutations. 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. 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). Mutations and Subscriptions. It will look something like: https://example.us-west-2.aws.cloud.dgraph.io/graphql. First of all, let's start with the login mutation. An experiment on microservices using Graphql queries and mutations. Let us write a mutation to update the title of a blog post. 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. Now that we know how to do queries, implementing mutations seems like an easy task. Mutations# Most discussions of GraphQL focus on data fetching, but any complete data platform needs a way to modify server-side data as well. Using this method adds another layer of complexity. Since we don’t have anything in our database, let’s do a mutation first. Mutations. Now that we have the new queries and mutations, we can go to the Playground and make a new query and new mutation. In this article, I'll introduce you to GraphQL mutation. 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. 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. You can use the GraphQL playground at localhost:4000/graphql to test the queries and mutations described in this post. - msusur/graphql-playground We need to add a mutation property to our type definition and implement it in the resolvers. Files have to be uploaded to REST first, then the resulting upload URL is passed in the GraphQL mutation. The login mutation. Let’s go back to GraphQL Playground and execute the following to start a subscription: Making all other cache updates Implementing Mutations. GraphQL operations can be of two types, queries and mutations. 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: { "slug": "example" } 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. As far as I can tell, the query works on node, as the contents of the 'blog' are being populated. 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. 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