graphql-datetime

Standalone GraphQL Scalar type for Date values in JavaScript.

type User {
  id: ID!
  name: String!
  createdAt: DateTime!
  lastActiveAt: DateTime!
}

extend type Query {
  user: User!
}

extend type Mutation {
  setUserLastActiveAt(id: ID!, lastActiveAt: lastActiveAt!): Boolean!
}

Install

$ npm install --save graphql @jdrydn/graphql-datetime

From your codebase, you can either use predefined items (type definition & resolver) directly in your project or define the scalar yourself & include the scalar instance in your resolvers.

The following example uses graphql-tools & the predefined items:

const assert = require('assert');
const { typeDefs: dateTimeTypeDefs, resolvers: dateTimeResolvers } = require('@jdrydn/graphql-datetime');

const typeDefs = /* GraphQL */`
  type User {
    id: ID!
    name: String!
    createdAt: DateTime!
    lastActiveAt: DateTime!
  }

  extend type Query {
    user: User!
  }

  extend type Mutation {
    setUserLastActiveAt(id: ID!, lastActiveAt: lastActiveAt!): Boolean!
  }
`;

const resolvers = {
  Query: {
    async user(_, { id }) {
      const user = await getUser(id);
      return user && user.id ? user : null;
    },
  },
  Mutation: {
    async setUserLastActiveAt(_, { id, lastActiveAt }) {
      const user = await getUser(id);
      assert(user && user.id, 'User not found');

      // Set the last active at
      user.lastActiveAt = lastActiveAt;

      await setUser(id, user);
      return true;
    },
  },
};

const schema = makeExecutableSchema({
  typeDefs: [ typeDefs, dateTimeTypeDefs ],
  resolvers: [ resolvers, dateTimeResolvers ],
});

Whereas this example uses apollo-server & includes the scalar instance DateTime in its resolvers:

const { ApolloServer } = require('apollo-server');
const { DateTime } = require('@jdrydn/graphql-datetime');

const typeDefs = /* GraphQL */`
  type User {
    id: ID!
    name: String!
    createdAt: DateTime!
    lastActiveAt: DateTime!
  }

  extend type Query {
    user: User!
  }

  extend type Mutation {
    setUserLastActiveAt(id: ID!, lastActiveAt: lastActiveAt!): Boolean!
  }

  # @NOTE You must define the scalar yourself
  scalar DateTime
`;

const resolvers = {
  Query: {
    async user(_, { id }) {
      const user = await getUser(id);
      return user && user.id ? user : null;
    },
  },
  Mutation: {
    async setUserLastActiveAt(_, { id, lastActiveAt }) {
      const user = await getUser(id);
      assert(user && user.id, 'User not found');

      // Set the last active at
      user.lastActiveAt = lastActiveAt;

      await setUser(id, user);
      return true;
    },
  },
  DateTime,
};

const server = new ApolloServer({
  typeDefs,
  resolvers,
});

Usage

Once the type definition & resolver is configured, you can send & receive Date values in GraphQL in both queries & mutations.

Query

query GetUser {
  user(id: "1") {
    id
    name
    lastActiveAt
  }
}

{
  "data": {
    "user": {
      "id": "1",
      "name": "jdrydn",
      "lastActiveAt": "2022-05-01T09:00:00.000Z"
    }
  }
}

Mutation

mutation UpdateUser {
  setUserLastActiveAt(id: "1", lastActiveAt: "2022-05-01T09:00:00.000Z")
}

{
  "data": {
    "setUserLastActiveAt": true
  }
}

Notes

• Any questions or suggestions please open an issue.