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Query Variables

What is a variable in GraphQL context?

GraphQL has a first-class way to factor dynamic values out of the query, and pass them as a separate dictionary. These values are called variables. In our case, we are defining the object to be inserted as a mutation.

So let's define the graphql mutation to be used.

Open src/components/Todo/TodoInput.svelte and add the following code:

githubsrc/components/Todo/TodoInput.svelte
<script>
+ import { gql } from "@apollo/client";
+ const ADD_TODO = gql `
+ mutation ($todo: String!, $isPublic: Boolean!) {
+ insert_todos(objects: {title: $todo, is_public: $isPublic}) {
+ affected_rows
+ returning {
+ id
+ title
+ created_at
+ is_completed
+ }
+ }
+ }
+ `;
</script>
<form class="formInput" on:submit|preventDefault={addTodo}>
<input
class="input"
placeholder="What needs to be done?"
/>
<i class="inputMarker fa fa-angle-right" />
</form>

What does this mutation do?

The mutation inserts into todos table with the $objects variable being passed as one todo type.

Awesome! We have defined our first graphql mutation.

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