Displaying filter formula errors

app/views/ingredients/_index.html.erb

@@ -2,6 +2,8 @@
   locals: {url: filter_project_ingredients_path(@project)} %>
 
 <% if @ingredients.any? { |i| i.persisted? } %>
+  <%= error_messages_for @formula_q.formula %>
+
   <table class="list">
     <thead>
       <tr>

app/views/measurements/_index.html.erb

@@ -2,6 +2,8 @@
   locals: {url: filter_project_measurements_path(@project)} %>
 
 <% if @measurements.any? { |m| m.persisted? } %>
+  <%= error_messages_for @formula_q.formula %>
+
   <table class="list">
     <thead>
       <tr>

app/views/measurements/_readouts.html.erb

@@ -4,6 +4,8 @@
 <% if @measurements.any? %>
   <%= render partial: 'measurements/options' %>
 
+  <%= error_messages_for @formula_q.formula, *@quantities.map { |q| q.formula } %>
+
   <table class="readouts list odd-even">
     <thead>
       <tr>