Hi all

What's the most Cake-ish way to deal with multicolumn unique indexes?

let me explain:

i have two models *Material HABTM Mix*.
I must keep track of some addtional infos (% of material for each mix) in 
the join table so, as stated in the cookbook, i scomposed the relationship 
in *2x hasMany*.
*Material hasMany MaterialMix hasMany Mix*.
here comes the problem: *each material can only be in a mix one time*.
so the combination between *materials_mixes.material_id* and *
materials_mixes.mix_id* must be unique.
how can i do that?

Note: the *combination* of field values must be unique, not the value itself

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