[MFSNW26] Add boilerplate GraphQL structure (#20)

* added boilerplate graphql-related files

* lint fix

* downgrade express

Author: ericahan22

backend/graphql/index.ts

@@ -0,0 +1,25 @@
+import { gql } from 'apollo-server-express';
+import { makeExecutableSchema } from '@graphql-tools/schema';
+import { merge } from 'lodash';
+
+import sampleResolvers from './resolvers/sampleResolvers';
+import sampleType from './types/sampleType';
+
+const query = gql`
+  type Query {
+    _empty: String
+  }
+`;
+
+const mutation = gql`
+  type Mutation {
+    _empty: String
+  }
+`;
+
+const executableSchema = makeExecutableSchema({
+  typeDefs: [query, mutation, sampleType],
+  resolvers: merge(sampleResolvers),
+});
+
+export default executableSchema;

backend/graphql/resolvers/sampleResolvers.ts

@@ -0,0 +1,34 @@
+import SampleService from '../../services/implementations/sampleService';
+import ISampleService from '../../services/interfaces/sampleService';
+
+const sampleService: ISampleService = new SampleService();
+
+const sampleResolvers = {
+  Query: {
+    sampleById: async (_: unknown, { id }: { id: string }) => {
+      return sampleService.getSampleById(id);
+    },
+    samples: async () => {
+      return sampleService.getAllSamples();
+    },
+  },
+  Mutation: {
+    createSample: async (
+      _: unknown,
+      { sample }: { sample: { name: string; description: string } }
+    ) => {
+      return sampleService.createSample(sample);
+    },
+    updateSample: async (
+      _: unknown,
+      { id, sample }: { id: string; sample: { name: string; description: string } }
+    ) => {
+      return sampleService.updateSample(id, sample);
+    },
+    deleteSampleById: async (_: unknown, { id }: { id: string }) => {
+      return sampleService.deleteSampleById(id);
+    },
+  },
+};
+
+export default sampleResolvers;

backend/graphql/types/sampleType.ts

@@ -0,0 +1,29 @@
+import { gql } from 'apollo-server-express';
+
+const sampleType = gql`
+  type SampleDTO {
+    id: String!
+    name: String!
+    description: String!
+    createdAt: String!
+    updatedAt: String!
+  }
+
+  input CreateSampleDTO {
+    name: String!
+    description: String!
+  }
+
+  extend type Query {
+    sampleById(id: String!): SampleDTO!
+    samples: [SampleDTO!]!
+  }
+
+  extend type Mutation {
+    createSample(sample: CreateSampleDTO!): SampleDTO!
+    updateSample(id: String!, sample: CreateSampleDTO!): SampleDTO!
+    deleteSampleById(id: String!): SampleDTO!
+  }
+`;
+
+export default sampleType;

backend/models/sample.model.ts

@@ -0,0 +1,19 @@
+import { Column, DataType, Model, Table } from 'sequelize-typescript';
+
+@Table({ tableName: 'samples' })
+export default class Sample extends Model {
+  @Column({ type: DataType.STRING, primaryKey: true })
+  id!: string;
+
+  @Column({ type: DataType.STRING })
+  name!: string;
+
+  @Column({ type: DataType.STRING })
+  description!: string;
+
+  @Column({ type: DataType.DATE })
+  createdAt!: Date;
+
+  @Column({ type: DataType.DATE })
+  updatedAt!: Date;
+}