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dataService.js
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dataService.js
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const mongoose = require("mongoose");
module.exports = (mongoDBConnectionString) => {
const User = require("./model/Users");
return {
// Connection to db and defines User model
connect: () => {
return new Promise(function (resolve, reject) {
let db = mongoose.createConnection(mongoDBConnectionString, {
useNewUrlParser: true,
useUnifiedTopology: true,
});
db.on("error", (err) => {
reject(err);
});
db.once("open", () => {
resolve();
});
});
},
addNewUser: function (data) {
return new Promise((resolve, reject) => {
let newUser = new User(data);
newUser.save((err) => {
if (err) {
reject(err);
} else {
resolve(`new User: ${newUser._id} successfully added`);
}
});
});
},
getAllUsers: (page, perPage) => {
return new Promise((resolve, reject) => {
if (+page && +perPage) {
let filter = {};
page = +page - 1;
User.find(filter)
.sort({ Balance: -1 })
.skip(page * +perPage)
.limit(+perPage)
.exec()
.then((users) => {
resolve(users);
})
.catch((err) => {
reject(err);
});
} else {
reject("page and perPage query parameters must be present");
}
});
},
getUserByName: (userData) => {
return new Promise((resolve,reject)=>{
User.findOne({UserName: userData.username})
.limit(1)
.exec()
.then((user)=>{
if(user.Password === userData.password){
resolve(user);
}else{
reject("Incorrect Password.");
}
})
.catch((err)=>reject(`${err}`))
});
},
getUserById: function (id) {
return new Promise((resolve, reject) => {
User.findOne({ _id: id })
.exec()
.then((user) => {
resolve(user);
})
.catch((err) => {
reject(err);
});
});
},
updateUserById: function (data, id) {
return new Promise((resolve, reject) => {
User.updateOne(
{ _id: id },
{
$set: data,
}
)
.exec()
.then(() => {
resolve(`user ${id} successfully updated`);
})
.catch((err) => {
reject(err);
});
});
},
updateUserBalance : function (Balance,id) {
return new Promise((resolve, reject) => {
User.updateOne(
{ _id: id },
{
Balance,
}
)
.exec()
.then(() => {
User.findById({_id:id}).exec().then((user)=>{resolve(user)}).catch(err => reject(err))
})
.catch((err) => {
reject(err);
});
});
}
,
updateUserBalanceByUserName : function (Balance,UserName) {
return new Promise((resolve, reject) => {
User.updateOne(
{ UserName },
{
Balance,
}
)
.exec()
.then(() => {
resolve(`Balance updated for ${UserName}`)
})
.catch((err) => {
reject(err);
});
});
}
,
deleteUserById: function (id) {
return new Promise((resolve, reject) => {
User.deleteOne({ _id: id })
.exec()
.then(() => {
resolve(`user ${id} successfully deleted`);
})
.catch((err) => {
reject(err);
});
});
},
};
};