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package memdb
// Changes describes a set of mutations to memDB tables performed during a
// transaction.
type Changes []Change
// Change describes a mutation to an object in a table.
type Change struct {
Table string
Before interface{}
After interface{}
// primaryKey stores the raw key value from the primary index so that we can
// de-duplicate multiple updates of the same object in the same transaction
// but we don't expose this implementation detail to the consumer.
primaryKey []byte
}
// Created returns true if the mutation describes a new object being inserted.
func (m *Change) Created() bool {
return m.Before == nil && m.After != nil
}
// Updated returns true if the mutation describes an existing object being
// updated.
func (m *Change) Updated() bool {
return m.Before != nil && m.After != nil
}
// Deleted returns true if the mutation describes an existing object being
// deleted.
func (m *Change) Deleted() bool {
return m.Before != nil && m.After == nil
}
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