Rails: How should I adjust the 'each' method under a nest structure? - ruby-on-rails

Question

Before putting pinunder the nest structure of group,
One of the view looked like this:
<div class="transitions-enabled" id="pins">
<% #pins.each do |pin| %>
<div class="box panel panel-default">
<%= link_to (image_tag pin.image.url), pin %>
<div class="panel-body">
<h2><%= link_to pin.title, pin %></h2>
</div>
<div class="footer">
<div class="row footer-all">
<div class="col-md-6">
<p class="user">Submitted by <%= pin.user.username %></p>
</div>
<div class="col-md-6">
<div class="btn-group like_btn">
<% if user_signed_in? %>
<% if current_user.voted_up_on?(pin) %>
<%= link_to unlike_pin_path(pin), method: :put, class: "btn btn-default" do %>
<span class='glyphicon glyphicon-heart'></span>
<%= pin.get_upvotes.size %>
<%end%>
<% else %>
<%= link_to like_pin_path(pin), method: :put, class: "btn btn-default" do %>
<span class='glyphicon glyphicon-heart'></span>
<%= pin.get_upvotes.size %>
<%end%>
<% end %>
<% else %>
<div class="like_btn">
<span class='glyphicon glyphicon-heart'></span>
<%= pin.get_upvotes.size %>
</div>
<% end %>
</div>
</div>
</div>
</div>
</div>
<%end%>
How should I adjust it after I put it under group (I'll mark the code which I think needed to change with'* *'):
Group has_many pins
Pin belongs_to group
<div class="transitions-enabled" id="pins">
<% #pins.each do |pin| %>
<div class="box panel panel-default">
<%= link_to (image_tag pin.image.url), *pin* %>
<div class="panel-body">
<h2><%= link_to pin.title, *pin* %></h2>
</div>
<div class="footer">
<div class="row footer-all">
<div class="col-md-6">
<p class="user">Submitted by <%= pin.user.username %></p>
</div>
<div class="col-md-6">
<div class="btn-group like_btn">
<% if user_signed_in? %>
<% if current_user.voted_up_on?(*pin*) %>
<%= link_to unlike_group_pin_path(*pin*), method: :put, class: "btn btn-default" do %>
<span class='glyphicon glyphicon-heart'></span>
<%= pin.get_upvotes.size %>
<%end%>
<% else %>
<%= link_to like_group_pin_path(*pin*), method: :put, class: "btn btn-default" do %>
<span class='glyphicon glyphicon-heart'></span>
<%= pin.get_upvotes.size %>
<%end%>
<% end %>
<% else %>
<div class="like_btn">
<span class='glyphicon glyphicon-heart'></span>
<%= pin.get_upvotes.size %>
</div>
<% end %>
</div>
</div>
</div>
</div>
</div>
<%end%>

Answer 1

After stating that your objective is to use this view file to filter the pins depending on its group, then I can think of two approaches for this.
Use nested resources. (RailsCast)
This is a little trickier than 2. but it is much more organised, and RESTful
You could check the RailsCast if you are interested. Otherwise, I will just go explaining 2. as it's simpler.
Use params[:group_id] to filter the pins.
In the PinsController, add the following at the very end of the method where this view is rendered.
#group = Group.where(id: params[:group_id]).first
#pins = #pins.where(group: #group) if #group
Then in your view files, you'll just have to tweak your links to specify the group_id parameter. If this view file is associated to the #index method, then change
<%= link_to 'Link', pins_path %>
Into
<%= link_to 'Link', pins_path(group_id: 1) %>
Change 1 accordingly as you wish. If you don't specify the parameter group_id, the link will still work but you will notice that the page will show all pins, and not filtered by group.

Answer 2

Thanks for everyone's help, I think I find the problem:
The view should be changed into:
<div class="transitions-enabled" id="pins">
<% #pins.each do |pin| %>
<div class="box panel panel-default">
<%= link_to (image_tag pin.image.url), group_pin_path(#group, pin)
%>
<div class="panel-body">
<h2><%= link_to pin.title, group_pin_path(#group, pin) %></h2>
</div>
<div class="footer">
<div class="row footer-all">
<div class="col-md-6">
<p class="user">Submitted by <%= pin.user.username %></p>
</div>
<div class="col-md-6">
<div class="btn-group like_btn">
<% if user_signed_in? %>
<% if current_user.voted_up_on?(#group, pin) %>
<%= link_to unlike_group_pin_path(#group, pin), method: :put, class: "btn btn-default" do %>
<span class='glyphicon glyphicon-heart'></span>
<%= pin.get_upvotes.size %>
<%end%>
<% else %>
<%= link_to like_group_pin_path(#group, pin), method: :put, class: "btn btn-default" do %>
<span class='glyphicon glyphicon-heart'></span>
<%= pin.get_upvotes.size %>
<%end%>
<% end %>
<% else %>
<div class="like_btn">
<span class='glyphicon glyphicon-heart'></span>
<%= pin.get_upvotes.size %>
</div>
<% end %>
</div>
</div>
</div>
</div>
</div>
<%end%>
And remember to state #group = Group.find(params[:group_id]) in the PinController, this is very important.