How do I validate update based on selected values in a key with Ruby?

Question

I want to implement a conditional update method on a specific set of values for a key.

I want to allow updates only if the original list.permissions values (set on create) equal either "public", "viewable, or "editable". If the list.permissions value for a record does not equal one of those three acceptable values, updating the record is denied (locked).

I tried modifying the strong params in a private method in the controller file:

def list_params_validated
     params.require(:list).permit(:title, permissions: ["public",  "viewable", "editable"])
end

and then calling that in my update method in the same controller:

def update
  list = List.find(params[:id])
  if list.update(list_params_validated)

    render json: list

  else
    render json: { errors: list.errors.full_messages }, status: :unprocessable_entity
  end
end

no luck with this, any help would be most appreciated!

Answer 1

You can add an custom validation on your List model as following and call simple update in controller.

self.permissions value should be string like "public" or "viewable" or "editable".

validate :validate_editable, :validate_permissions:on => :update


def editable?
   self.permissions != "locked"
end

private

def validate_editable
   errors.add(:base, "Not Ediable!") unless  editable?
end

def validate_permissions
   unless ["public",  "viewable", "editable"].include?(self.permissions)
      errors.add(:base, "Permission denied!")
   end 
end