Get the input from Prompt and use it to change a field inside a javascript file, Yeoman

Question

I'm doing a generator using Yeoman

I know it must be very simple, but I start using yeoman very recently and I'm not very familiar with it.
I want to get the user's input and use it to change a class name or variable

---

I ask the user what is the name of the class

this.controllerName = await this.prompt({
        type: 'input',
        name: 'controllerName',
        message: `What's the name of the controller?`
      })

I know how to change the file's name

this.destinationPath(`${this.controllerName.controllerName}Controller.js`)

But I don't know how to change a field inside the file. Example:
My template class

class TemplateController {
  createTemplate (req, res) {
    console.log('GET request')
    res.json('URL WORKING!')
  }

I'd like to change the class/method name for what the user answered in the prompt

class UserController {
  createUser (req, res) {
    console.log('GET request')
    res.json('URL WORKING!')
  }

Answer 1

Add placeholders to your base file ( yeoman uses EJS template engine ):

_controller.js

class <%= name %>Controller {
  create<%= name %> (req, res) {
    console.log('GET request')
    res.json('URL WORKING!')
  }
}

Pass user input as name to your template:

index.js

...
writing() {
  this.fs.copyTpl(
    this.templatePath('_controller.js'),
    this.destinationPath(`${this.controllerName.controllerName}Controller.js`),
    {
      name: this.controllerName.controllerName
    }
  )
}
...