Ok I have a many to many relationship with additional fields on the join 
table.  I'm joining Materials and Locations via LocationMaterial.

class Location < ActiveRecord::Base
  hobo_model # Don't put anything above this
  fields do
    name :string
    timestamps
  end
  set_default_order "name DESC"
  belongs_to :space
  has_many :location_materials, :dependent => :destroy, :accessible => :true
  has_many :materials, :through => :location_materials
  children :materials
  ...
end

class Material < ActiveRecord::Base
  hobo_model # Don't put anything above this
  fields do
    name :string
    quantity :float
    timestamps
  end
  set_default_order "name DESC"
  has_many :location_materials, :dependent => :destroy
  has_many :locations, :through => :location_materials, :accessible => :true
  ...
end 

class LocationMaterial < ActiveRecord::Base
  hobo_model # Don't put anything above this
  fields do
    condition enum_string(:Intact, :Damaged, :SeverelyDamaged)
    potential enum_string(:Damage, :SevereDamage)
    friable :boolean
    percent_damage :integer
    accessible :boolean
    notes :text
    timestamps
  end
  inline_booleans true
  belongs_to :material
  belongs_to :location
  ...
end

 The resulting auto generated form for Location is

<def tag="form" for="Location">
  <form merge param="default">
    <error-messages param/>
    <field-list fields="name, location_materials, space" param/>
    <div param="actions">
      <submit label="#{ht 'location.actions.save', :default=>['Save']}" 
param/><or-cancel param="cancel"/>
    </div>
  </form>
</def>

This works fine but I want to make some changes to the location_materials 
fields.  IE ignore some, reorder them etc.  I tried 
location_material.condition and location_material[condition] or even 
a separate extended tag form for LocationMaterial but none of it worked.

Any hints towards this would be appreciated.

Thanks
Bob

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