A scope allows you to specify an ARel query that can be used as a method call to the model (or association objects).
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There’s a problem if we try using a scope for a relative date, though.
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This code gets evaluated when the server is started, and the output of
Date.today is stored in the scope.
That scope is equivalent to the following:
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The date is hardcoded in there, and will not be changed until the scope is re-evaluated. This typically happens only when the server is restarted.
To get around this problem, use a lambda when defining date (or time) based scopes. This will force the evaluation of the scope each time it is called.
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