feat: defining a custom scalar DateTime
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@ -1,5 +1,6 @@
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const { UserInputError } = require('apollo-server');
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const yup = require('yup');
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const dateTimeScalar = require('./scalars/dateTime');
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const data = require('./data');
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const uuidSchema = yup.string().min(36).max(36);
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@ -76,5 +77,6 @@ module.exports = {
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const { reservationProducts } = input;
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return data.createReservation({ reservationProducts });
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}
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}
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},
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DateTime: dateTimeScalar,
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};
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@ -0,0 +1,65 @@
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const { GraphQLScalarType } = require('graphql');
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const { GraphQLError } = require('graphql/error')
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const { Kind } = require('graphql/language');
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module.exports = new GraphQLScalarType({
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name: 'DateTime',
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description: 'Use JavaScript Date object for date/time fields.',
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serialize(value) {
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let v = value;
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if (!(v instanceof Date) && typeof v !== 'string' && typeof v !== 'number') {
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throw new TypeError(
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`Value is not an instance of Date, Date string or number: ${v}`,
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);
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}
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if (typeof v === 'string') {
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v = new Date();
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v.setTime(Date.parse(value));
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} else if (typeof v === 'number') {
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v = new Date(v);
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}
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if (Number.isNaN(v.getTime())) {
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throw new TypeError(`Value is not a valid Date: ${v}`);
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}
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return v.toJSON();
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},
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parseValue(value) {
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const date = new Date(value);
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if (Number.isNaN(date.getTime())) {
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throw new TypeError(`Value is not a valid Date: ${value}`);
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}
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return date;
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},
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parseLiteral(ast) {
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if (ast.kind !== Kind.STRING && ast.kind !== Kind.INT) {
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throw new GraphQLError(
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`Can only parse strings & integers to dates but got a: ${ast.kind}`,
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);
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}
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const result = new Date(ast.kind === Kind.INT ? Number(ast.value) : ast.value);
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if (Number.isNaN(result.getTime())) {
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throw new GraphQLError(`Value is not a valid Date: ${ast.value}`);
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}
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if (ast.kind === Kind.STRING && ast.value !== result.toJSON()) {
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throw new GraphQLError(
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`Value is not a valid Date format (YYYY-MM-DDTHH:MM:SS.SSSZ): ${
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ast.value
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}`,
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);
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}
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return result;
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},
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});
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@ -3,11 +3,13 @@ const { gql } = require('apollo-server');
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// Type definitions define the "shape" of your data and specify
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// which ways the data can be fetched from the GraphQL server.
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module.exports = gql`
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scalar DateTime
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# Comments in GraphQL are defined with the hash (#) symbol.
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type Product {
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description: String
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id: String
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id: ID
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name: String
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price: Float
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}
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@ -15,7 +17,7 @@ module.exports = gql`
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# This "Store" type can be used in other type declarations.
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type Store {
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city: String
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id: String
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id: ID
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name: String
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number: Int
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postalCode: String
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@ -29,8 +31,8 @@ module.exports = gql`
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}
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type Reservation {
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date: String
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id: String
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date: DateTime
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id: ID
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reservationProducts: [ReservationProduct]
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}
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@ -38,7 +40,7 @@ module.exports = gql`
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# (A "Mutation" type will be covered later on.)
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type Query {
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stores: [Store]
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store(id: String): Store
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store(id: ID): Store
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}
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input StoreInput {
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