Express validator Check if the name does not exits in the db to enable creation-CodePudding

I want a validator to check if the category title does not exist to enable the creation of the category, but if the category exists then forbid the creation. How do I check that?

This is my model:

const CategoryScheme = new mongoose.Schema({
  title: {
    type: String,
  },
  dishes: [{ type: mongoose.Types.ObjectId }],
  timestamps: true,
  versionKey: false,
});

CodePudding user response：

You can do something like this in your middleware.

// if you are passing the category in req.body
const { title } = req.body
const category = await CategoryModel.findOne({title})

// This checks if there exists a category with the given title
if(category){
    // Return a response if the category is present
    return res.status(400).send({message: 'Category already taken!'}
}

next()