Не могу правильно передать запрос. Как правильно передать и считать запрос?

Question

[lum1ere]

У меня есть схема:

const {Schema, model} = require("mongoose")

const ProductSchema = new Schema({
    title: {
        type: String
    },
    price: {
        type:Number,
        min:0,
        required:true     
    },
    description: {
        type: String
    },
    category: {
        type: String
    },
    img:{
        type:String
    }
})

module.exports = model('Product', ProductSchema)

Есть кнопка с который я получаю req параметр:

<div class="sort">
        <a class="btn-sort" href="/product/birthdays">Дни рождения</a>
    </div>

И передаю все это в контроллер:

const getProductCategory = (req, res) => {
  const title = "Дни рождения"
  Products.find({category:req.params.category})
  .then((productscategory) => console.log(productscategory))
  .catch((error) => {
    console.log(error);
  })
}

Но при нажатии получаю ошибку, и я не понимаю что делать.

CastError: Cast to ObjectId failed for value "birthdays" (type string) at path "_id" for model "Product"
    at model.Query.exec (F:\Project\testproject\node_modules\mongoose\lib\query.js:4584:21)
    at model.Query.Query.then (F:\Project\testproject\node_modules\mongoose\lib\query.js:4683:15)
    at getProduct (F:\Project\testproject\controllers\productController.js:7:6)
    at Layer.handle [as handle_request] (F:\Project\testproject\node_modules\express\lib\router\layer.js:95:5)
    at next (F:\Project\testproject\node_modules\express\lib\router\route.js:137:13)
    at Route.dispatch (F:\Project\testproject\node_modules\express\lib\router\route.js:112:3)
    at Layer.handle [as handle_request] (F:\Project\testproject\node_modules\express\lib\router\layer.js:95:5)
    at F:\Project\testproject\node_modules\express\lib\router\index.js:281:22
    at param (F:\Project\testproject\node_modules\express\lib\router\index.js:354:14)
    at param (F:\Project\testproject\node_modules\express\lib\router\index.js:365:14) {
  messageFormat: undefined,
  stringValue: '"birthdays"',
  kind: 'ObjectId',
  value: 'birthdays',
  path: '_id',
  reason: BSONTypeError: Argument passed in must be a string of 12 bytes or a string of 24 hex characters
      at new BSONTypeError (F:\Project\testproject\node_modules\bson\lib\error.js:41:28)
      at new ObjectId (F:\Project\testproject\node_modules\bson\lib\objectid.js:65:23)
      at castObjectId (F:\Project\testproject\node_modules\mongoose\lib\cast\objectid.js:25:12)
      at ObjectId.cast (F:\Project\testproject\node_modules\mongoose\lib\schema\objectid.js:245:12)
      at ObjectId.SchemaType.applySetters (F:\Project\testproject\node_modules\mongoose\lib\schematype.js:1135:12)
      at ObjectId.SchemaType._castForQuery (F:\Project\testproject\node_modules\mongoose\lib\schematype.js:1567:15)
      at ObjectId.SchemaType.castForQuery (F:\Project\testproject\node_modules\mongoose\lib\schematype.js:1557:15)
      at ObjectId.SchemaType.castForQueryWrapper (F:\Project\testproject\node_modules\mongoose\lib\schematype.js:1534:20)
      at cast (F:\Project\testproject\node_modules\mongoose\lib\cast.js:336:32)
      at model.Query.Query.cast (F:\Project\testproject\node_modules\mongoose\lib\query.js:5007:12),
  valueType: 'string'
}