Display errors for table-embedeed forms

app/helpers/application_helper.rb

@@ -1,6 +1,6 @@
 module ApplicationHelper
   # TODO: replace legacy content_tag with tag.tagname
-  class TabularFormBuilder < ActionView::Helpers::FormBuilder
+  class LabelledFormBuilder < ActionView::Helpers::FormBuilder
     (field_helpers - [:label]).each do |selector|
       class_eval <<-RUBY_EVAL, __FILE__, __LINE__ + 1
         def #{selector}(method, options = {})
@@ -19,7 +19,7 @@ module ApplicationHelper
       end
     end
 
-    def table_form_for(&block)
+    def form_for(&block)
       @template.content_tag(:table, class: "centered") { yield(self) } +
       # Display leftover error messages (there shouldn't be any)
       @template.content_tag(:div, @object&.errors.full_messages.join(@template.tag :br))
@@ -50,9 +50,14 @@ module ApplicationHelper
     end
   end
 
-  def tabular_form_for(record, options = {}, &block)
+  def labelled_form_for(record, options = {}, &block)
-    options.merge! builder: TabularFormBuilder
+    options.merge! builder: LabelledFormBuilder
-    form_for(record, **options, &-> (f) { f.table_form_for(&block) })
+    form_for(record, **options) { |f| f.form_for(&block) }
+  end
+
+  def tabular_fields_for(record_name, record_object = nil, options = {}, &block)
+    flash.now[:alert] = record_name.errors.full_messages unless record_name.errors.empty?
+    fields_for(record_name, record_object, **options, &block)
   end
 
   def svg_tag(source, options = {})

app/views/layouts/application.turbo_stream.erb

@@ -1,4 +1,6 @@
+<%= yield %>
+
+<%# Some views may convert ActiveRecord errors to flashes, render at the end. %>
 <%= turbo_stream.update :flashes do %>
   <%= render_flash_messages %>
 <% end %>
-<%= yield %>

app/views/units/_form.html.erb

@@ -1,4 +1,4 @@
-<%= fields_for @unit do |form| %>
+<%= tabular_fields_for @unit do |form| %>
   <%= tag.tr id: dom_id(@unit), class: "form", onkeydown: "processKey(event)",
     data: {link_id: link_id} do %>
 

app/views/units/_form_close.html.erb

@@ -1,2 +1,3 @@
 <%= turbo_stream.close_form @unit %>
+<%= turbo_stream.update :flashes %>
 <%#= turbo_stream.focus link_id %>

app/views/users/confirmations/new.html.erb

@@ -1,5 +1,5 @@
 <div class="main">
-  <%= tabular_form_for resource, url: user_confirmation_path do |f| %>
+  <%= labelled_form_for resource, url: user_confirmation_path do |f| %>
     <%= f.email_field :email, required: true, size: 30, autofocus: true, autocomplete: "email",
       value: (resource.pending_reconfirmation? ? resource.unconfirmed_email : resource.email) %>
 

app/views/users/passwords/edit.html.erb

@@ -1,5 +1,5 @@
 <div class="main">
-  <%= tabular_form_for resource, url: user_password_path, html: {method: :put} do |f| %>
+  <%= labelled_form_for resource, url: user_password_path, html: {method: :put} do |f| %>
     <%= f.hidden_field :reset_password_token, label: false %>
 
     <%= f.password_field :password, label: t(".new_password"), required: true, size: 30,

app/views/users/passwords/new.html.erb

@@ -1,5 +1,5 @@
 <div class="main">
-  <%= tabular_form_for resource, url: user_password_path do |f| %>
+  <%= labelled_form_for resource, url: user_password_path do |f| %>
     <%= f.email_field :email, required: true, size: 30, autofocus: true, autocomplete: "email" %>
 
     <%= f.submit t(:recover_password) %>

app/views/users/registrations/edit.html.erb

@@ -9,7 +9,7 @@
   </div>
 <% end %>
 
-<%= tabular_form_for resource, url: registration_path(resource), html: {method: :patch} do |f| %>
+<%= labelled_form_for resource, url: registration_path(resource), html: {method: :patch} do |f| %>
   <%= f.email_field :email, size: 30, autofocus: true, autocomplete: "off" %>
   <% if f.object.pending_reconfirmation? %>
     <%= f.text_field :unconfirmed_email, readonly: true, tabindex: -1,

app/views/users/registrations/new.html.erb

@@ -1,5 +1,5 @@
 <div class="main">
-  <%= tabular_form_for resource, url: user_registration_path do |f| %>
+  <%= labelled_form_for resource, url: user_registration_path do |f| %>
     <%= f.email_field :email, required: true, size: 30, autofocus: true, autocomplete: "email" %>
     <%= f.password_field :password, required: true, size: 30,
       minlength: @minimum_password_length, autocomplete: "new-password",

app/views/users/sessions/new.html.erb

@@ -1,5 +1,5 @@
 <div class="main">
-  <%= tabular_form_for resource, url: user_session_path do |f| %>
+  <%= labelled_form_for resource, url: user_session_path do |f| %>
     <%= f.email_field :email, required: true, size: 30, autofocus: true, autocomplete: "email" %>
     <%= f.password_field :password, required: true, size: 30, minlength: @minimum_password_length,
       autocomplete: "current-password" %>

app/views/users/show.html.erb

@@ -4,7 +4,7 @@
   </div>
 <% end %>
 
-<%= tabular_form_for @user do |f| %>
+<%= labelled_form_for @user do |f| %>
   <%= f.email_field :email, readonly: true %>
   <% if f.object.pending_reconfirmation? %>
     <%= f.email_field :unconfirmed_email, readonly: true,

config/locales/en.yml

@@ -13,6 +13,12 @@ en:
         created_at: registered
         confirmed_at: confirmed
         unconfirmed_email: Awaiting confirmation for
+    errors:
+      models:
+        unit:
+          attributes:
+            symbol:
+              taken: has to be unique
   actioncontroller:
     exceptions:
       status: