I do something similar, but you only need to remove it from mass assignment
controller
@thing = Thing.new(params[:thing])
@thing.value = "enchilada"
model
attr_accessible :name, :description <===== value cant be mass_assigned
since is done programatically there is no need to validate it
even better create a class method in the model that raises an exception if
it fails and call instead of the save method, in it set the value you want :
)
def selft.supersave!
do the stuff
or raise Exception.new("OMG LOL")
end
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