Silly read only databases...

app/controllers/joints_controller.rb

@@ -0,0 +1,14 @@
+class JointsController < ApplicationController
+  def index
+    # Grab values:
+    @available_categories = JointsDashboard.distinct.pluck(:Joint)
+
+    # Start with base query:
+    @records = JointsDashboard.all
+
+    # Filter data based on dropdown selection params
+    @records = @records.where(Joint: params[:joint]) if params[:joint].present?
+    #@records = @records.where(Joint == params[:joint]) if params[:joint].present?
+    puts @records
+  end
+end

app/models/joints_dashboard.rb

@@ -0,0 +1,10 @@
+class JointsDashboard < ApplicationRecord
+  self.table_name = "Joints"
+
+  # Prevent actidental updates from code:
+  def readonly?
+    true
+  end
+
+  
+end

app/views/joints/joints.html.erb

@@ -0,0 +1,39 @@
+<h1>Excel Replacement Dashboard</h1>
+
+<!-- Dropdown Filters Form -->
+<%= form_with url: dashboard_path, method: :get, local: true do |f| %>
+  <div>
+    <%= f.label :category, "Select Category:" %>
+    <%= f.select :category, options_for_select(@available_categories, params[:category]), include_blank: "All Categories" %>
+  </div>
+
+  <div>
+    <%= f.label :region, "Select Region:" %>
+    <%= f.select :region, options_for_select(@available_regions, params[:region]), include_blank: "All Regions" %>
+  </div>
+
+  <%= f.submit "Filter Data" %>
+<% end %>
+
+<hr>
+
+<!-- Displaying the Data in Specific Locations / Table -->
+<h2>Dashboard Results</h2>
+<table>
+  <thead>
+    <tr>
+      <th>Column 1</th>
+      <th>Column 2</th>
+      <th>Value</th>
+    </tr>
+  </thead>
+  <tbody>
+    <% @records.each do |record| %>
+      <tr>
+        <td><%= record.category_column %></td>
+        <td><%= record.region_column %></td>
+        <td><%= record.metric_value_column %></td>
+      </tr>
+    <% end %>
+  </tbody>
+</table>