trades_controller.rb

class Api::TradesController < ApplicationController
  respond_to :json

  def index
    render json: DataTable.new(Trade, params)
  end

  def create
    trade = Trade.new(safe_params)
    trade.save
    respond_with trade
  end

  def update
    # respond_with Trade.update(params[:id], safe_params)
  end

private
  def safe_params
    params.permit(:name)
  end
end