Super basic version

app/controllers/dashboard_controller.rb

@@ -1,2 +1,31 @@
 class DashboardController < ApplicationController
+  def index
+    joint_column = 'joint'
+    # Grab distinct values for dropdown filters
+    @available_joints = Joint.distinct.pluck(joint_column)
+
+    # Fetch initial records
+    @records = filter_records
+
+    respond_to do |format|
+      format.html # Renders app/views/dashboards/index.html.erb
+      format.json { render json: @records } # Returns filtered data as JSON for JS
+    end
+  end
+
+  private
+
+  def filter_records
+    records = Joint.all
+    records = records.where(joint: params[:joint]) if params[:joint].present?
+    records
+  end
+
+  # old broken: def index
+  # old broken:   @joint = Joint.distinct.pluck(:Joint)
+  # old broken: 
+  # old broken:   @records = Joint.all
+  # old broken: 
+  # old broken:   @records = @records.where(Joint: params[joint]) if params[:joint].present?
+  # old broken: end
 end