wrestlingdev.com/app/controllers/weights_controller.rb

class WeightsController < ApplicationController
  before_action :set_weight, only: [:show, :edit, :update, :destroy]

  # GET /weights
  # GET /weights.json
  def index
    @weights = Weight.all
  end

  # GET /weights/1
  # GET /weights/1.json
  def show
    if params[:wrestler]
      Wrestler.update(params[:wrestler].keys, params[:wrestler].values)
    end
    @wrestlers = Wrestler.all
    @tournament = Tournament.find(@weight.tournament_id)

  end

  # GET /weights/new
  def new
    @weight = Weight.new
    if params[:tournament]
      @tournament_field = params[:tournament]
      @tournament = Tournament.find(params[:tournament])
    end
  end

  # GET /weights/1/edit
  def edit
    @tournament_field = @weight.tournament_id
    @mats = Mat.where(tournament_id: @weight.tournament.id)
  end

  # POST /weights
  # POST /weights.json
  def create
    if user_signed_in?
    else
      redirect_to root_path
    end
    @weight = Weight.new(weight_params)
    @tournament = Tournament.find(weight_params[:tournament_id])

      respond_to do |format|
        if @weight.save
          format.html { redirect_to @tournament, notice: 'Weight was successfully created.' }
          format.json { render action: 'show', status: :created, location: @weight }
        else
          format.html { render action: 'new' }
          format.json { render json: @weight.errors, status: :unprocessable_entity }
        end
      end
  end

  # PATCH/PUT /weights/1
  # PATCH/PUT /weights/1.json
  def update
    if user_signed_in?
    else
      redirect_to root_path
    end
    @tournament = Tournament.find(@weight.tournament_id)
    respond_to do |format|
      if @weight.update(weight_params)
        format.html { redirect_to @tournament, notice: 'Weight was successfully updated.' }
        format.json { head :no_content }
      else
        format.html { render action: 'edit' }
        format.json { render json: @weight.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /weights/1
  # DELETE /weights/1.json
  def destroy
    if user_signed_in?
    else
      redirect_to root_path
    end
    @tournament = Tournament.find(@weight.tournament_id)
    @weight.destroy
    respond_to do |format|
      format.html { redirect_to @tournament }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_weight
      @weight = Weight.find(params[:id])
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def weight_params
      params.require(:weight).permit(:max, :tournament_id, :mat_id)
    end
end