[Feature] Enum support

[Epigene]

Hi!

I am interested in developing a sort of enum support for jsonb fields.

The use case:
A JSONB field key should be allowed to have one of a predefined set of (string) values.

Pseudocode of DSL:

class Product
  jsonb_accessor :data,
    status: [:string, enum: [:available, :en_route, :unavailable], default: :available]   
end

p = Product.new
p.status #=> "available"
p.status = "en_route" #=> "en_route"
p.status #=> "en_route"
p.data
#=> {
  "status" => "en_route"
}

p.status = "discontinued" #=> RuntimeError, status "discontinued" not supported, try [:available, :en_route, :unavailable].

Does this sound like something that would get added to this gem were I to make a PR?

[abhiyan52]

Hey what is the status of this feature?

[preetsethi]

I tried this:

jsonb_accessor :index_config,
    index_scope: [:string, default: "off"],
    multi_field_op: [:string, default: "or"]

  enum index_scope: {
    off: "off",
    source: "source",
    global: "global"
  }, _prefix: :index

  enum multi_field_op: {
    combined_uniqueness: "and",
    field_uniqueness: "or"
  }

Declare fields with jsonb_accessor then define Rails enum (using Hash) on field.
Works flawlessly!!!

Original proposal:

p.status = "discontinued" #=> RuntimeError, status "discontinued" not supported, try [:available, :en_route, :unavailable].

Rails enum:

Model.last.update({index_scope: "bad option"})
ArgumentError: 'bad option' is not a valid index_scope

[haffla]

As @preetsethi has demonstrated this works perfectly fine. Thanks