mongoose

问题 I am uploading the images from an IOS application to Firebase which returns to me the metadata including the URL of type URL . Should I store it of type String in the database like below code? or there is specific type for URL s? var schema = new Schema({ downloadURL: { type: String, createdDate: Date.now } }) 回答1: Well, As per the docs Monngoose doesn't have a schema type for URL. You could just use a string with RegExp to validate it or use some custome made type like this one var mongoose

问题 Is there a way to user mongoose.find({title:'some title'}) to query the same field with multiple values? For example something like this mongoose.find({title:'some title', title:'some other title'}) sends back only documents matching title:'some other title is there a way to accomplish this ? 回答1: You should use the MongoDB $in operator - mongoose.find({title: {$in: ['some title', 'some other title']}}) You provide an array to $in operator and it will return all the documents which have an

问题 Is there a way to user mongoose.find({title:'some title'}) to query the same field with multiple values? For example something like this mongoose.find({title:'some title', title:'some other title'}) sends back only documents matching title:'some other title is there a way to accomplish this ? 回答1: You should use the MongoDB $in operator - mongoose.find({title: {$in: ['some title', 'some other title']}}) You provide an array to $in operator and it will return all the documents which have an

问题 I'm having a doubt in The Web Developer Bootcamp course from section 29,304 module (node:15807) Warning: Accessing non-existent property 'count' of module exports inside circular dependency (Use node --trace-warnings ... to show where the warning was created) (node:15807) Warning: Accessing non-existent property 'findOne' of module exports inside circular dependency (node:15807) Warning: Accessing non-existent property 'remove' of module exports inside circular dependency (node:15807) Warning

问题 I'm having a doubt in The Web Developer Bootcamp course from section 29,304 module (node:15807) Warning: Accessing non-existent property 'count' of module exports inside circular dependency (Use node --trace-warnings ... to show where the warning was created) (node:15807) Warning: Accessing non-existent property 'findOne' of module exports inside circular dependency (node:15807) Warning: Accessing non-existent property 'remove' of module exports inside circular dependency (node:15807) Warning

问题 I would like to do a synchronous loop in a part of my code. The function saveInDatabase checks if the item title (string) already exists in the database. That's why it can't be resolved in parallel, otherwise the condition will never apply (and would create duplicates). Promise.all(arr.map(item => { saveInDatabase(item).then((myResult) => ... ); })); I tried to encapsulate this function into separate promises, also tried with npm packages (synchronous.js, sync), but it seems that it does not

问题 I have recently started using mongoDB and mongoose for my new node.js application. Having only used relational databases before I am struggling to adapt to the mongoDB/noSQL way of thinking such as denormalization and lack of foreign key relationships. I have this relational database design: **Users Table** user_id username email password **Games Table** game_id game_name **Lobbies Table** lobby_id game_id lobby_name **Scores Table** user_id game_id score So, each lobby belongs to a game, and

问题 I am using mongoose to perform CRUD operation on MongoDB. This is how my schema looks. var EmployeeSchema = new Schema({ name: String, description: { type: String, default: 'No description' }, departments: [] }); Each employee can belong to multiple department. Departments array will look like [1,2,3]. In this case departments.length = 3. If the employee does not belong to any department, the departments.length will be equal to 0. I need to find all employee where EmployeeSchema.departments

问题 I am using mongoose to perform CRUD operation on MongoDB. This is how my schema looks. var EmployeeSchema = new Schema({ name: String, description: { type: String, default: 'No description' }, departments: [] }); Each employee can belong to multiple department. Departments array will look like [1,2,3]. In this case departments.length = 3. If the employee does not belong to any department, the departments.length will be equal to 0. I need to find all employee where EmployeeSchema.departments

问题 I am using mongoose to perform CRUD operation on MongoDB. This is how my schema looks. var EmployeeSchema = new Schema({ name: String, description: { type: String, default: 'No description' }, departments: [] }); Each employee can belong to multiple department. Departments array will look like [1,2,3]. In this case departments.length = 3. If the employee does not belong to any department, the departments.length will be equal to 0. I need to find all employee where EmployeeSchema.departments