Added admin budget phases controller and routes

app/controllers/admin/budget_phases_controller.rb

@@ -0,0 +1,26 @@
+class Admin::BudgetPhasesController < Admin::BaseController
+
+  before_action :load_phase, only: [:edit, :update]
+
+  def edit; end
+
+  def update
+    if @phase.update(budget_phase_params)
+      redirect_to edit_admin_budget_path(@phase.budget), notice: t("flash.actions.save_changes.notice")
+    else
+      render :edit
+    end
+  end
+
+  private
+
+  def load_phase
+    @phase = Budget::Phase.find(params[:id])
+  end
+
+  def budget_phase_params
+    valid_attributes = [:starts_at, :ends_at, :summary, :description, :enabled]
+    params.require(:budget_phase).permit(*valid_attributes)
+  end
+
+end