A JoinPart represents a part of a JoinDependency. It is inherited by JoinBase and JoinAssociation. A JoinBase represents the Active Record which everything else is being joined onto. A JoinAssociation represents an association which is joining to the base. A JoinAssociation may result in more than one actual join operations (for example a has_and_belongs_to_many JoinAssociation would result in two; one for the join table and one for the target table).

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