Here was my solution. I couldn't get the :conditions to accept a parameter.
It may be possible but was beyond my current skill set.
First remember I model is essentially
Locations <-> Materials -> Samples
And I'm wanting to add locations to samples but only locations where the
materials exist at.
First I added a scope to Locations to find only those locations that have
the given material
scope :material_locations, lambda { |m| {
:joins => :materials,
:conditions => ["materials.id = ?", m.id]
} }
Next I edited the show for materials since I'm using the embedded form to
add new samples to materials via an auto_actions_for :material, [:create] in
the samples controller. I needed to get all the locations the material
being samples is at.
def show
hobo_show do
@material_locations = Location.material_locations(this)
end
end
I had to do the same thing to the sample controller edit method for when the
user edits a sample
def edit
hobo_show do
@material_locations = Location.material_locations(this.material)
end
end
I then edited the form for samples to limit the select-one list for the
locations to use my custom lists of locations. Note I also added
a costume text-method to location since a locations could be repeated and
the user wouldn't be able to tell one from another. location_space includes
the locations parent name to help distinguish them.
<location-view:>
<select-one options="&@material_locations"
text-method="location_space" include-none="&false"/>
</location-view:>
Now the user can only add locations to samples where the materials already
exist at.
Bob
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