can_rate? can not deal with dimension = nil#51
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both the old version and this one don't work with inheritance because the polymorphic association will use the class.parent_name instead of class.name
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a better approach would be let active record help us, something like:
val = rates.select_value("count(*) as cnt").where(dimension: dimension, rater_id: user_id)There was a problem hiding this comment.
this code is much simpler and will work find with model inheritance
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If dimension.nil? , query should be " dimension is null ", not "dimension = '' ".