FreeCodeCamp/HelpFrontEnd

hey everyone! I am building a simple class, and when trying to access this inside a static method like this:

const { ProductsCollection } = require('../utils/Collection')
let modeledCollection = ProductsCollection.mapToModel(legacy)

I get that this.generateModel is not a function. Here is my class:

class ProductsCollection {
    constructor () {
    generateModel () {
        let model = { name: 'testing' }
        return model
    }

    static mapToModel (legacy) {
        if (!isObject(legacy))
            return legacy

        let current = this.generateModel() // Here!!!
        for (let key in legacy) {
          // some code...
        }
        return current
    }
}

module.exports = { ProductsCollection }

any idea why?