On Oct 20, 2009, at 8:01 PM, Nate Wiger wrote:
> One follow-up: Is there any reason why this is not supported?
>
> game.game_players_dataset[17]
>
> There's an explicit error thrown, and an explicit check in the class
> for this situation:
>
> # Returns the first record matching the conditions. Examples:
> #
> # ds[:id=>1] => {:id=1}
> def [](*conditions)
> raise(Error, ARRAY_ACCESS_ERROR_MSG) if (conditions.length == 1
> and conditions.first.is_a?(Integer)) or conditions.length == 0
> first(*conditions)
> end
>
> Which is odd to me only because these work and are supported:
>
> Game[4]
> GamePlayer[17]
Making a guess:
Model.[] allows a single integer because there is a one-to-one
correspondence with a DB table and the primary key or keys are known.
A dataset may represent a join or other composition of multiple
tables, or a subset of columns from a single table (possibly without
any primary key column(s)). Thus, Dataset#[] can't reliably know
anything about the primary key column(s) that may or may not be present.
Am I right?
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