melcher · December 28, 2013 20:33 · Dec 28, 2013 · Oct 1, 2011 · Aug 6, 2011 · Aug 5, 2011
diff --git a/gistfile1.txt → example.rb b/gistfile1.txt → example.rb
diff --git a/gistfile1.txt b/gistfile1.txt
@@ -2,26 +2,10 @@ class Product < ActiveRecord::Base
 
   has_many :material_product_mappings, :dependent => :destroy, :inverse_of => :product
   has_many :materials, :through => :material_product_mappings, :autosave => true
-
+  accepts_nested_attributes_for :material_product_mappings # really needed feature
   #...
 
-  rails_admin do
-    list do
-      field :material_product_mappings do
-        label "Materials"
-        visible true
-      end
-      #...
-    end
-    edit do
-      form_builder :nested_form_for
-      field :material_product_mappings do
-        label "Materials"
-        partial "edit_material_product_mappings"
-      end
-      #...
-    end
-  end
+
 
 end
 
@@ -35,20 +19,28 @@ class MaterialProductMapping < ActiveRecord::Base
   def name
     "#{self.material.name} (#{self.material.unit.name}) x #{self.num_units}"
   end
-
-  rails_admin do
-    label "Materials"
-    visible false
-  end
 end
-
+# file .../config/initializers/rails_admin.rb
+  RailsAdmin.config do |config|
+  config.model MaterialProductMapping do
+    edit do
+      form_builder :nested_form_for
+      field :material_product_mappings do
+        label "Materials"
+        partial "edit_material_product_mappings"
+      end
+      #...
+    end
+  end
+  end
 
 # file .../app/views/rails_admin/main/_edit_material_product_mappings.html.erb
 
 <div class="field <%= field.dom_id %>">
   <% _saved_object = @object %>
   <% _saved_form = form %>
   <% _saved_field = field %>
+  <%# add here basic element's fileds if you have them %>
   <%= label_tag(field.dom_id, field.label) %>
   <div style="clear:left;padding-left:100px">
     <%= form.fields_for(:material_product_mappings) %>
@@ -74,8 +66,21 @@ end
 <%= ff.collection_select('material_id',Material.active,:id,:name,:prompt => false) %>
 <%= ff.link_to_remove('Remove') %>
 
-# also need to copy app/views/layouts/rails_admin/_head.html.haml from the rails_admin installation to
-#  your app and modify it to include nested_form's JS. add the following line:
-
-    - head_javascript "nested_form"
+I also had to override javascripts to make nested resources working. I hope that this will be fixed in future releases
+# file .../app/assets/javascripts/rails_admin/rails_admin.js
+//= require rails_admin/jquery-1.6.2.js
+//= require rails_admin/jquery_ujs.js
+//= require rails_admin/jquery-ui-1.8.14.js
+//= require rails_admin/jquery.ui.timepicker.js
+//= require rails_admin/ra.datetimepicker.js
+//= require rails_admin/ra.filter-box.js
+//= require rails_admin/activo/application.js
+//= require rails_admin/activo/jquery.tipsy.js
+//= require rails_admin/ra.filtering-multiselect.js
+//= require rails_admin/ra.filtering-select.js
+//= require rails_admin/ra.remote-form.js
+//= require rails_admin/ra.timeline.js
+//= require rails_admin/jquery.colorpicker.js
+//= require jquery_nested_form
+//= require rails_admin/application.js
 
diff --git a/gistfile1.txt b/gistfile1.txt
@@ -36,7 +36,7 @@ class MaterialProductMapping < ActiveRecord::Base
     "#{self.material.name} (#{self.material.unit.name}) x #{self.num_units}"
   end
 
-  ra_config do
+  rails_admin do
     label "Materials"
     visible false
   end

diff --git a/gistfile1.txt b/gistfile1.txt
@@ -0,0 +1,81 @@
+class Product < ActiveRecord::Base
+
+  has_many :material_product_mappings, :dependent => :destroy, :inverse_of => :product
+  has_many :materials, :through => :material_product_mappings, :autosave => true
+
+  #...
+
+  rails_admin do
+    list do
+      field :material_product_mappings do
+        label "Materials"
+        visible true
+      end
+      #...
+    end
+    edit do
+      form_builder :nested_form_for
+      field :material_product_mappings do
+        label "Materials"
+        partial "edit_material_product_mappings"
+      end
+      #...
+    end
+  end
+
+end
+
+class MaterialProductMapping < ActiveRecord::Base
+  belongs_to :product, :inverse_of => :material_product_mappings
+  belongs_to :material, :inverse_of => :material_product_mappings
+
+  validates :num_units,
+  :numericality =>  { :greater_than_or_equal_to => 0 }
+
+  def name
+    "#{self.material.name} (#{self.material.unit.name}) x #{self.num_units}"
+  end
+
+  ra_config do
+    label "Materials"
+    visible false
+  end
+end
+
+
+# file .../app/views/rails_admin/main/_edit_material_product_mappings.html.erb
+
+<div class="field <%= field.dom_id %>">
+  <% _saved_object = @object %>
+  <% _saved_form = form %>
+  <% _saved_field = field %>
+  <%= label_tag(field.dom_id, field.label) %>
+  <div style="clear:left;padding-left:100px">
+    <%= form.fields_for(:material_product_mappings) %>
+    <p>
+      <%= form.link_to_add('Add Material ', :material_product_mappings) %>
+    </p>
+    <% @object = _saved_object %>
+    <% form = _saved_form %>
+    <% field = _saved_field %>
+    <% if field.has_errors? %>
+      <span class="errorMessage"><%= "#{field.label } #{field.errors.first}" %></span>
+    <% end %>
+  </div>
+</div>
+
+# file .../app/views/rails_admin/main/_material_product_mapping_fields.html.erb
+#  nested form looks for this file...
+<% ff = f %>
+<% ff.object.errors.full_messages.each do |msg| %>
+   <p class="flash_alert_msg"><%= msg %></p>
+<% end %>
+<%= ff.number_field(:num_units, :min => 0.0, :step => 0.01, :size => 6, :style => "text-align:right") %>
+<%= ff.collection_select('material_id',Material.active,:id,:name,:prompt => false) %>
+<%= ff.link_to_remove('Remove') %>
+
+# also need to copy app/views/layouts/rails_admin/_head.html.haml from the rails_admin installation to
+#  your app and modify it to include nested_form's JS. add the following line:
+
+    - head_javascript "nested_form"
+