Ruby: If last variable was saved more than 3 hours ago - ruby-on-rails

Question

I have a ruby form to submit reports for an exercise on my app. An exercise has_many reports. I want to create an if statement that makes this form only appear if the last report from that exercise was saved more than 3 hours ago.
So far I have:
But this is creating a NoMethodError saying undefined method 'report' for #<Exercise:0x007f9c892f48b0>.
It's being displayed on my workouts#show page (a workout has_many exercises, in case it helps), so I believe this is the reigning controller:
class WorkoutsController < ApplicationController
def index
#workouts = Workout.all
end
def show
#workout = Workout.find(params[:id])
#exercise = Exercise.new
#report = Report.new
end
def new
#workout = Workout.new
#workout.user_id = current_user
end
def create
#workout = Workout.new(workout_params)
#workout.user = current_user
if #workout.save
flash[:notice] = "Workout was saved successfully."
redirect_to #workout
else
flash.now[:alert] = "Error creating workout. Please try again."
render :new
end
end
def edit
#workout = Workout.find(params[:id])
end
def update
#workout = Workout.find(params[:id])
#workout.name = params[:workout][:name]
#workout.workout_type = params[:workout][:workout_type]
#workout.teaser = params[:workout][:teaser]
#workout.description = params[:workout][:description]
#workout.video = params[:workout][:video]
#workout.difficulty = params[:workout][:difficulty]
#workout.trainer = params[:workout][:trainer]
#workout.user_id = params[:workout][:user_id]
if #workout.save
flash[:notice] = "Workout was updated successfully."
redirect_to #workout
else
flash.now[:alert] = "Error saving workout. Please try again."
render :edit
end
end
def destroy
#workout = Workout.find(params[:id])
if #workout.destroy
flash[:notice] = "\"#{#workout.name}\" was deleted successfully."
redirect_to action: :index
else
flash.now[:alert] = "There was an error deleting the workout."
render :show
end
end
private
def workout_params
params.require(:workout).permit(:name, :workout_type, :teaser, :description, :video, :difficulty, :trainer, :user_id)
end
end
Any ideas where I'm going wrong?
ADDITIONAL INFORMATION:
This bit is technically on my workouts#show page:
<% if #workout.exercises.count == 0 %>
<p>Looks like you get a freebie for this one! No score report today. Rest up and drink some water. It ain't always that easy...</p>
<% else %>
<% #workout.exercises.each do |exercise| %>
<%= render 'reports/form', report: #report, exercise: exercise %>
<% if current_user.admin? %>
<div class="text-center"><%= link_to "Delete #{exercise.name}", [exercise], method: :delete, data: { confirm: 'Are you sure?' } %></div>
<% end %>
<hr>
<% end %>
But here is the partial it renders, where the code in question actually lies:
<% if exercise.report.last != nil && exercise.report.last.created_at < ( DateTime.now - (3/24.0)) %>
<%= form_for report,
:url => { :controller => "reports",
:action => :create,
:exercise_id => exercise.id } do |f| %>
<div class="row">
...

Answer 1

It seems you calling singularized report instead of reports.
if exercise.report.last
If reports relates to exercise as has_many you need to call it with exercise.reports.last
Also, you mentioned results in your question, but calling reports in your view.
An exercise has_many results.
...
exercise.report.last
Please be sure you calling appropriate pluralize method reports or results