Merge pull request #273 from ajibade3210/nodeGraphql

Node graphql

nodejs/graphql/student-register/README.md

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+### NBuild Awesome CRUD APIs Using Apollo Server(Graphql), MongoDB and Node.Js Code Example

nodejs/graphql/student-register/index.js

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+const { ApolloServer } = require("@apollo/server");
+const { startStandaloneServer } = require("@apollo/server/standalone");
+const mongoose = require("mongoose");
+const { resolvers } = require("./resolvers.js");
+const { typeDefs } = require("./models/typeDefs.js");
+
+const MONGO_URI = "mongodb://localhost:27017/student-register";
+
+// Database connection
+mongoose
+  .connect(MONGO_URI, {
+    useNewUrlParser: true,
+    useUnifiedTopology: true,
+  })
+  .then(() => {
+    console.log(`Db Connected`);
+  })
+  .catch(err => {
+    console.log(err.message);
+  });
+
+const server = new ApolloServer({ typeDefs, resolvers });
+
+startStandaloneServer(server, {
+  listen: { port: 4000 },
+}).then(({ url }) => {
+  console.log(`Server ready at ${url}`);
+});

nodejs/graphql/student-register/models/Student.js

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+const mongoose = require("mongoose");
+
+const Student = mongoose.model("Student", {
+  firstName: String,
+  lastName: String,
+  age: Number,
+});
+
+module.exports = { Student };

nodejs/graphql/student-register/models/typeDefs.js

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+const gql = require("graphql-tag");
+
+const typeDefs = gql`
+  type Query {
+    hello: String
+    welcome(name: String): String
+    students: [Student] #return array of students
+    student(id: ID): Student #return student by id
+  }
+  type Student {
+    id: ID
+    firstName: String
+    lastName: String
+    age: Int
+  }
+  type Mutation {
+    create(firstName: String, lastName: String, age: Int): Student
+    update(id: ID, firstName: String, lastName: String, age: Int): Student
+    delete(id: ID): Student
+  }
+`;
+
+module.exports = { typeDefs };

nodejs/graphql/student-register/package.json

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+{
+  "name": "graphql",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "start": "node index.js",
+    "dev": "nodemon index.js"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "@apollo/server": "^4.4.1",
+    "graphql": "^16.6.0",
+    "graphql-tag": "^2.12.6",
+    "mongoose": "^7.0.1"
+  }
+}

nodejs/graphql/student-register/resolvers.js

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+const { Student } = require("./models/Student.js");
+
+// GraphQL Resolvers
+const resolvers = {
+  Query: {
+    hello: () => "Hello from Reflectoring Blog",
+    welcome: (parent, args) => `Hello ${args.name}`,
+    students: async () => await Student.find({}), // return array of students
+    student: async (parent, args) => await Student.findById(args.id), // return student by id
+  },
+  Mutation: {
+    create: async (parent, args) => {
+      const { firstName, lastName, age } = args;
+      const newStudent = new Student({
+        firstName,
+        lastName,
+        age,
+      });
+      await newStudent.save();
+      return newStudent;
+    },
+    update: async (parent, args) => {
+      const { id } = args;
+      const updatedStudent = await Student.findByIdAndUpdate(id, args);
+      if (!updatedStudent) {
+        throw new Error(`Student with ID ${id} not found`);
+      }
+      return updatedStudent;
+    },
+    delete: async (parent, args) => {
+      const { id } = args;
+      const deletedStudent = await Student.findByIdAndDelete(id);
+      if (!deletedStudent) {
+        throw new Error(`Student with ID ${id} not found`);
+      }
+      return deletedStudent;
+    },
+  },
+};
+
+module.exports = { resolvers };