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