Rails: No route matches... missing required keys: [:element_id] - ruby-on-rails

Question

So, basically, I have Features nested within Elements which is nested within Apps. The Apps show page contains a Table of Elements, and each Element has a table of Features. I know that this will look a bit messy, but I'm more worried about functionality right now, and I'll clean up the HTML later.
Full error:
Showing ~/app/views/apps/show.html.erb where line #41 raised:
No route matches {:action=>"new", :controller=>"apps/elements/features",
:element_id=>nil} missing required keys: [:element_id]
My FeaturesController (only a few methods shown for the sake of space)
class Elements::FeaturesController < ApplicationController
before_action :set_feature, only: [:show, :edit, :update, :destroy]
# GET /features
# GET /features.json
def index
#features = Feature.all
respond_with(#features)
end
# GET /features/1
# GET /features/1.json
def show
respond_with(#element.features)
end
# GET /features/new
def new
#element = Element.find(params[:element_id])
#feature.element = #element
#feature = Feature.new
end
# GET /features/1/edit
def edit
end
# POST /features
# POST /features.json
def create
#element = Element.find(params[:element_id])
#feature = Feature.new(feature_params)
#feature.element = #element
#feature.save
if #feature.save
flash[:notice] = "#{#feature.name} purchase was added to the #{#feature.element.name}."
redirect_to(#feature)
else
flash[:error] = "There was a problem adding the purchase."
render :show
end
end
My show.html.erb for Apps:
<p id="notice"><%= notice %></p>
<p>
<strong>Name:</strong>
<%= #app.name %>
</p>
<p>
<strong>Infivewords:</strong>
<%= #app.infivewords %>
</p>
<p>
<strong>Description:</strong>
<%= #app.description %>
</p>
<div class="media">
<div class="media-body">
<table class="table table-hover">
<thead>
<tr>
<th>Name</th>
<th>Description</th>
<th>Delete</th>
<tr>
</thead>
<tbody>
<% #app.elements.each do |element| %>
<tr>
<td><h4><%= element.name %></h4><br><h4><%= element.description %></h4></td>
<td>
<% element.features.each do |feature| %>
<td><h4><%= feature.name %></h4><h4><%= feature.description %></h4>
</td>
<% end %>
<td><h4><%= link_to "Delete", [#app, element], method: :delete, confirm: "Are you sure?" %></h4></td>
<td><%= link_to 'Add a Feature', new_element_feature_path(#element), class: 'pull-right' %></td>
</tr>
<% end %>
</tbody>
</table>
</div>
</div>
<br>
<br>
<%= link_to 'Add an Element', new_app_element_path(#app) %>
<br>
<%= link_to 'Edit', edit_app_path(#app) %> |
<%= link_to 'Back', apps_path %>
Routes:
Rails.application.routes.draw do
resources :apps do
resources :elements, controller: 'apps/elements'
end
resources :elements do
resources :features, except: [:index], controller: 'apps/elements/features'
end
root to: 'apps#index'
Please excuse the mess. I'm new to rails and I've been tearing my code apart trying to figure this out. Please let me know if I should post any more code. Thank you in advance!

Answer 1

try changing the path inside
<td><%= link_to 'Add a Feature', new_element_feature_path(#element), class: 'pull-right' %></td>
to
new_element_feature_path(element)
since you are still looping #app.elements, right?

Answer 2

Solution:
In view, changed params to #element.feature:
<%= link_to 'Add a Feature', new_app_element_feature_path(#element.feature), class: 'pull-right' %>