Add support to check/define abilities per fields

[stalniy]

• allows to define rules per field
• allows to check rules per field
• ensure it correctly works in rulesToQuery function
• add function to extract permitted fields from rules
• update Typescript defs

It should be possible to define/check abilities per field:

const user = { id: 1 }
const ability = AbilityBuilder.define(can => {
  can('update', 'Post', ['likes'])
  can('update', 'Post', ['title', 'description'], { authorId: user.id })
})

console.log(ability.can('update', 'Post', 'title')) // false
console.log(ability.can('update', 'Post')) // true, because it's allowed to update Post partially its `likes` field

const post = new Post({ authorId: user.id })
console.log(ability.can('update', post, 'title')) // true
console.log(ability.can('update', post, 'createdAt')) // false

[stalniy]

Typescript

[Cholowao]

@stalniy you are doing great job man!

[stalniy]

@Cholowao I glad that you find this useful :)