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Variable Not in Scope

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Erroneous Code Example

This error occurs when you try to reference a variable that is not currently in scope or has not been declared. In this example, the variable userId is not declared. 
Query getUser() =>
    user <- N<User>(userId)
    RETURN user

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Solution

Declare the variable as a parameter before using it. 
Query getUser(userId: ID) =>
    user <- N<User>(userId)
    RETURN user
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