[Vuejs]-Add checkboxs values to data array in nuxt

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i solve it by writing a function to add category.id into form.categories :

addCategory (id) {
  if(!this.form.categories.includes(id))
     this.form.categories.push(id);
  else
     this.form.categories.splice(this.form.categories.indexOf(id), 1);
  this.search()

}

i call it in checkbox @change

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