Combining Query Parameters and Request Bodies

members_controller.rb

class MembersController < ApplicationController
  ...

  def index
    @members = member_params.any? ? Member.where(member_params) : Member.all

    json_options = params.fetch(:json_options, {})
    render json: @members.as_json(HashWithIndifferentAccess.new(json_options.permit!))
  end
  
  def member_params
    params.permit(:member_id, :employer_id, :plan_id)
  end
  
  ...
end