class DashboardController < ApplicationController
  def index
    joint_column = 'joint'
    @available_joints = Joint.distinct.pluck(joint_column)
    @available_data
    @records = filter_records

    respond_to do |format|
      format.html 
      format.json { render json: @records } 
    end
  end

  private

  def filter_records
    # Using .where(joint: params[:joint]) handles both present and nil values gracefully
    if params[:joint].present?
      Joint.where(joint: params[:joint])
    else
      # Return empty array if no joint selected to avoid loading thousands of records
      [] 
    end
  end
end