![]() GraphQL schema to have a nullable notes field. Todos so that they can add links or other necessary information. Let’s say we got feedback that users wanted to be able to add notes to their We’ve successfully abstracted away the implementation details of TodoCreated message with the decoded query result. Returned, we have Graphql.Http execute that query, ultimately returning the Once we’ve passed in our required arguments and defined what fields we want The second type parameter, often called the “typelock”, lets theĬompiler know what selection sets are valid to compose together. In this case, it’s the Todo type alias that weĭefined above. The first parameter is the kind of data structure we want to receiveĪfter running our mutation. Our todoFragment is an elm-graphql SelectionSet, which takes two type TodoFragment that describes that values that we would like to get back. This comes in extremely handy when your rules rely on data from database. We pass the createTodoįunction a record containing arguments for the mutation, as well as a Fragments allow you to define which fields your rule requires to work correctly. The Mutation module has a functionĬreateTodo that was generated from our schema. Here, we define a Todo type alias, which represents the shape to which ourĭecoded response value should conform. Type alias Todo = todoFragment |> Graphql. As a result, weĬan be sure that if our code is compiling, the query is:įor an evergreen To Do app, our GraphQL mutation to create a new Todo might Query and mutation functions and how to decode their responses. Leveraging Elm’s robust type system means that we can automate how to build
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