Adding validations without knowing the fields
- by Frexuz
My example form
<% form_for @ad do |f| %>
<%= f.error_messages %>
<p>
<%= f.label :ad_type_id %><br />
<%= f.collection_select(:ad_type_id, AdType.all, :id, :name) %>
</p>
<p>
<% @ad.ad_properties.each do |property| %>
<%= property.name %>:
<% f.fields_for :ad_values do |value_field| %>
<%= value_field.text_field :ad_id, :value => @ad.id %>
<%= value_field.text_field :ad_property_id, :value => property.id %>
<%= value_field.text_field :value %>
<% end %><br /><br />
<% end %>
</p>
<p>
<%= f.label :description %><br />
<%= f.text_area :description %>
</p>
<p><%= f.submit %></p>
<% end %>
Explanation:
Ad has many properties. I can add new properties at any time (it's a normal model).
Lets say the Ad is of the type 'hotel'. Then I would add properties like 'stars' and 'breakfast_included'
Then I store each of these properties' values in a separate model.
And all this works fine with my form above.
My problem:
These fields are not validated because I can't know what their names are.
I need to add validations dynamically somehow.
My thought:
#Before the normal validations kick in
def add_validations
self.properties.each do |property|
property.add_validation :whatever #somehow :)
end
end
How could I do this?
