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Expression is Not a Boolean

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Erroneous Code Example

This error occurs when an expression is expected to result in a boolean value but produces a different type. 
QUERY getUsers() =>
    users <- N<User>::WHERE(|u| u.name)
    RETURN users

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Solution

Ensure the expression evaluates to a boolean value. 
QUERY getUsers() =>
    users <- N<User>::WHERE(|u| u.active == true)
    RETURN users