toLocalizedJSON.js

const isArray = (str) => {
  console.log('str', str);
  if (str.indexOf('[].') > -1) {
    const split = str.split('[].')
    console.log('split', split);
    return {
      name: split[0],
      value: split[1]
    }
  }
  return false
}

export default (...fields) => {
  return (ctx, next) => {
    const lang = ctx.lang
    const body = ctx.request.body

    fields.map(key => {
      let array = isArray(key)
      if (array) {
        console.log('array', array);
        
        if (body[array.name]) {
          body[array.name].map((item, key) => {
            if (typeof item === 'object') {
              Object.keys(item).map(attribute => {
                body[array.name + '.' + key + '.' + attribute + '.' + lang] = item[attribute]
              })
            } else {
              body[array.name + '.' + key + '.' + array.value + '.' + lang] = item[array.value]
            }
            
            console.log('body', key, array.value);
            //delete item[array.value]
          })
          delete body[array.name]
        }

      } else {
        if (body[key] !== undefined) {
          body[key + '.' + lang] =  body[key]
          delete body[key]
        }
      }

    })

    ctx.request.bodyLang = body
    return next()
  }
}