_step.html.erb

A

<% if step.title != nil %>
	<p>
		<%= step.title %>
		<%= step.problem %>
		<%= step.solution %>
		<%= link_to 'Show', tutorial_step_path(tutorial_id, step) %>
		<%= link_to 'Destroy', tutorial_step_path(tutorial_id, step), method: :delete, data: { confirm: 'Are you sure?' } %>
	</p>
<% end %>

B

	<%= render partial: 'step', collection: @steps, :locals => { :tutorial_id => @tutorial.id } %> 

C_controller.rb

class StepsController < ApplicationController
before_action :correct_user, only: [:create, :destroy, :show]

def show
	@step = @tutorial.steps.find_by(id: params[:id])
	
	#I have also tried @step = Step.find(params[:id])
end

private
	def correct_user
		@tutorial = current_user.tutorials.find_by(id: params[:tutorial_id])
		redirect_to root_url if @tutorial.nil?
	end

	def step_params
		params.require(:step).permit(:title, :problem, :solution)
	end
end

C_show.html.erb

<%= render 'tutorials/step', :locals => { :tutorial_id => @tutorial.id } %>

C_show_attempt.html.erb

<!-- not sure how to define :step for the partial to use it. -->
<%= render 'tutorials/step', :locals => { :tutorial_id => @tutorial.id, :step => @step } %>