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There are times when entities don’t need navigation properties on both sides of the relationship. This is an example you can use to map to an existing database or generate a brand new database on Windows Azure SQL Database.


The ERD shows a Many to Many relationship between the FlightLog and the Airport entities. The requirements for the current model has no need for Airport to have a Navigation Property of FlightLogs.

Using Entity Frame Work Code First, the following statement can be used in the EntityTypeConfiguration to configure the relationship.

HasMany(r => r.Airports)
    .WithMany() // No navigation property here
    .Map(m =>

FlightLog has many Airports, the relationship is held in an intermediate table called BridgeTableForAirportsAndFlightlogs. By not specifying a property for the inverse Navigation Property, a unidirectional Many to Many relationship is created.

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