i'm writing a nodejs javascript api for book marking that is supposed to work likr instagrams save option, give me a model with all needed variablesShare Prompt
user
here is a model with all needed variables for a node.js and javascript-based bookmarking api similar to instagram's save option:

```javascript
const mongoose = require('mongoose');

const bookmarkschema = new mongoose.schema({
  user: {
    type: mongoose.schema.types.objectid,
    ref: 'user',
    required: true
  },
  post: {
    type: mongoose.schema.types.objectid,
    ref: 'post',
    required: true
  },
  createdat: {
    type: date,
    default: date.now
  }
});

const bookmark = mongoose.model('bookmark', bookmarkschema);

module.exports = bookmark;
```

this model represents a `bookmark` in a mongodb database using the mongoose library as an orm. the model includes the following fields:

1. `user`: this is a reference to the user who saved/bookmarked the post. it is an objectid, connected to the user model, and it is required.
2. `post`: this is a reference to the post being saved/bookmarked. it is an objectid, connected to the post model, and it is required.
3. `createdat`: this is a timestamp indicating when the bookmark was created, and it defaults to the current date and time.

please note that you need to have the `user` and `post` models defined in your project for this bookmark model to work effectively. also, you might want to adapt this example to fit your specific requirements and data model.
assistant
Here is a model with all needed variables for a Node.js and JavaScript-based bookmarking API similar to Instagram's save option:

```javascript
const mongoose = require('mongoose');

const bookmarkSchema = new mongoose.Schema({
  user: {
    type: mongoose.Schema.Types.ObjectId,
    ref: 'User',
    required: true
  },
  post: {
    type: mongoose.Schema.Types.ObjectId,
    ref: 'Post',
    required: true
  },
  createdAt: {
    type: Date,
    default: Date.now
  }
});

const Bookmark = mongoose.model('Bookmark', bookmarkSchema);

module.exports = Bookmark;
```

This model represents a `Bookmark` in a MongoDB database using the Mongoose library as an ORM. The model includes the following fields:

1. `user`: This is a reference to the user who saved/bookmarked the post. It is an ObjectId, connected to the User model, and it is required.
2. `post`: This is a reference to the post being saved/bookmarked. It is an ObjectId, connected to the Post model, and it is required.
3. `createdAt`: This is a timestamp indicating when the bookmark was created, and it defaults to the current date and time.

Please note that you need to have the `User` and `Post` models defined in your project for this Bookmark model to work effectively. Also, you might want to adapt this example to fit your specific requirements and data model.
assistant