undefined method `destroy' for nil:NilClass(rails) - ruby-on-rails

Question

I get this error:
NoMethodError in CycleRoadsController#destroy
undefined method `destroy' for nil:NilClass(rails).
This is code from controller and theyt include a method 'destroy ':
respond_to do |format|
if #cycle_road.save
format.html { redirect_to #cycle_road, notice: 'Cycle road was successfully created.' }
format.json { render action: 'show', status: :created, location: #cycle_road }
else
format.html { render action: 'new' }
format.json { render json: #cycle_road.errors, status: :unprocessable_entity }
end
end
end
def update
respond_to do |format|
if #cycle_road.update(cycle_road_params)
format.html { redirect_to #cycle_road, notice: 'Cycle road was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: 'edit' }
format.json { render json: #cycle_road.errors, status: :unprocessable_entity }
end
end
end
# DELETE /cycle_roads/1
# DELETE /cycle_roads/1.json
def destroy
#cycle_road.destroy
respond_to do |format|
format.html { redirect_to cycle_roads }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_cycle_road
#cycle_road = CycleRoad.find(params[:id])
end
def cycle_road_params
params.require(:cycle_road).permit(:name, :begin, :finish, :km, :description)
end
end
Anybody know, what's wrong?

Answer 1

Set the instance variable #cycle_road before calling destroy on it.
Currently its nil as the error clearly says undefined method 'destroy' for nil:NilClass.
As per the shared controller code, you would need to add destroy action in the before_action callback of set_cycle_road
class CycleRoadController < ApplicationController
before_action :set_cycle_road, only: [:show, :edit, :update, :destroy]
## ... ^
## Add this
end
This callback would take care of setting the #cycle_road instance variable before calling destroy action.

Answer 2

As the previous person mentioned it looks like #cycle_road is nil. Make sure that you have a before action:
class CycleRoadController < ApplicationController
...
before_action :set_cycle_road
...
And ensure that it runs for your destroy method. ie.
before_action :set_cycle_road, only: [:show, :edit, :update, :destroy]