Unknown 302 Redirect happening in Rails - ruby-on-rails

Question

I'm dealing with a 302 Redirect when trying to access certain network_hosts#show pages. It's not happening on all of them. I've been trying to diagnose the issue for the last 5 hours and an befuddled.
Here's how it goes....
User clicks the following link in view network_host/index.html.erb:
<%= link_to '<i class="fa fa-eye"></i>'.html_safe, network_host_path(h.id), "data-toggle" => "tooltip", "title" => "View" %>
The controller network_host#show kicks in:
class NetworkHostsController < ApplicationController
before_action :get_company_and_locations
def show
#network_host = NetworkHost.find(params[:id])
if #network_host
#major_issues = get_host_issues(#network_host, #network_host.last_test, "major")
#minor_issues = get_host_issues(#network_host, #network_host.last_test, "minor")
end
end
end
Which accesses helper methods in helpers/application_helper.rb:
def get_company_and_locations
#company = current_user.company
#devices = Device.where(company_id: #company.id).order(name: :asc)
#locations = if #company
current_user.company_locations.order(:name)
else
[]
end
end
def get_host_issues(network_host, last_test, severity)
get_company_and_locations
# the issue_ids to remove since they are deferred
deferred_ids = []
#company.deferred_issues.each do |d|
if d.network_host_id == network_host.id && d.expires_at.future?
deferred_ids.push(d.issue_id)
end
end
# figure out the issues
results = last_test.results.select{|result| result.issue.severity == "#{severity}"}.collect{|issue| issue }
issues = results.select{ |issue| issue.issue_id
end
At this point, the network_hosts/show.html.erb view should show, but instead my log is showing a 302 Redirect:
I, [2016-10-26T18:47:52.347035 #31947] INFO -- : Started GET "/network_hosts/4673" for 12.33.233.231 at 2016-10-26 18:47:52 -0500
I, [2016-10-26T18:47:52.349154 #31947] INFO -- : Processing by NetworkHostsController#show as HTML
I, [2016-10-26T18:47:52.349218 #31947] INFO -- : Parameters: {"id"=>"4673"}
I, [2016-10-26T18:47:52.369483 #31947] INFO -- : Rendered layouts/_back_button.html.erb (0.4ms)
I, [2016-10-26T18:47:52.377738 #31947] INFO -- : Rendered network_hosts/show.html.erb within layouts/application (10.2ms)
I, [2016-10-26T18:47:52.378656 #31947] INFO -- : Redirected to https://www.myserver.com/
I, [2016-10-26T18:47:52.378816 #31947] INFO -- : Completed 302 Found in 29ms (ActiveRecord: 9.7ms)
So, at this point, I don't see any reason there would be a redirect back to my root_url, do you?
The only thing I've been able to differentiate is that the network_hosts#show displays when there are no 'minor' issues (so 1 major/1 minor issues work, or 2 major/0 minor issues), but doesn't seem to work when there are 0 major and X minor issues. Which leads me back to get_host_issues function in application_helper#get_host_issues, but from here I'm stuck.
Here is the network_host/show.html.erb (trimmed down):
<div class="table-responsive">
<table id="major_issue_table" class="table table-striped">
<thead>
<tr>
<th>Severity </th>
<th>Code </th>
<th>Problem </th>
<th><span class="nobr">Action</span></th>
</tr>
</thead>
<tbody>
<% #major_issues.to_enum.with_index(1).each do |result, index| %>
<% issue = result.issue %>
<tr>
<td><%= issue_severity(issue) %></td>
<td><%= issue.name %></td>
<td><%= truncate(issue.problem, length: 100) %></td>
<td>
<a href='#' class='deferIssue' data-toggle='modal' data-tooltip='tooltip' data-resultid='<%= result.id %>' data-issueid='<%= issue.id %>' data-target='#deferIssueModal' title='Defer'><i class='fa fa-close'></i></a>
<%= link_to '<i class="fa fa-eye"></i>'.html_safe, issue_path({id: issue.id, network_host: #network_host.id}), "data-toggle" => "tooltip", "title" => "View" %>
</td>
</tr>
<% end %>
</tbody>
</table>
</div>
<div class="x_content">
<div class="table-responsive">
<table id="minor_issue_table" class="table table-striped">
<thead>
<tr>
<th>Severity </th>
<th>Code </th>
<th>Problem </th>
<th><span class="nobr">Action</span></th>
</tr>
</thead>
<tbody>
<% #minor_issues.to_enum.with_index(1).each do |result, index| %>
<% issue = result %>
<tr>
<td><%= issue_severity(issue) %></td>
<td><%= issue.name %></td>
<td><%= truncate(issue.problem, length: 100) %></td>
<td>
<a href='#' class='deferIssue' data-toggle='modal' data-tooltip='tooltip' data-resultid='<%= result.id %>' data-issueid='<%= issue.id %>' data-target='#deferHostModal' title='Defer'><i class='fa fa-close'></i></a>
<i class="fa fa-close"></i>
<%= link_to '<i class="fa fa-eye"></i>'.html_safe, issue_path(issue.id), "data-toggle" => "tooltip", "title" => "View" %>
</td>
</tr>
<% end %>
</tbody>
</table>
</div>
</div>
Update: Adding layouts/_back_button.html.erb
<div class="row">
<%= link_to "<span class='btn btn-default fa fa-home' style='margin-left:10px;'></span>".html_safe, :root %>
<%= link_to "<span class='btn btn-default fa fa-mail-reply'></span>".html_safe, :back %>
</div>

Answer 1

For major issues, you had this:
<% #major_issues.to_enum.with_index(1).each do |result, index| %>
<% issue = result.issue %>
<tr>
<td><%= issue_severity(issue) %></td>
...etc...
</tr>
<% end %>
Whereas for minor issues, you had this:
<% #minor_issues.to_enum.with_index(1).each do |result, index| %>
<% issue = result %>
<tr>
<td><%= issue_severity(issue) %></td>
...etc...
</tr>
<% end %>
Notably, in the first case you are passing an Issue object to issue_severity, whereas in the second case you are passing a Result object.
The Result object isn't going to respond to the same methods as an Issue object, so somewhere inside issue_severity, a NoMethodError is going to get raised.
The redirect almost certainly comes from a rescue_from block in ApplicationController, which catches exceptions in controller/view code and allows you to do something other than show a generic 500 error (in this case, it's probably something akin to rescue_from(Exception) { redirect_to :root }, which isn't the greatest plan; it should at least be logging the exception before redirecting, but given the logs you posted, that's not happening.