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Edge Type Does Not Have a Vector Type as Its From Source

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Erroneous Code Example

This error occurs when you try to use an edge in a context that requires the From type to be a vector type, but the edge’s From type is not a vector. 
QUERY getRelated(id: ID) =>
    user <- N<User>(id)
    related <- user->>SimilarTo
    RETURN related

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Solution

Set the From type of the edge to a vector type. 
V<128>::Document {
    title: String,
}

E::SimilarTo {
    From: Document,
    To: Document,
}