[2.0] OperationAttribute + ModelBuilder.Action = identical model entries

[robertmclaws]

The OperationAttribute system does not check to see if the operation in question already exists before adding a new reference. The end result is that there can be multiple references to the same operation in the completed model, without throwing an error.

Assemblies Affected

Restier 1.0.0 RC1

Steps to Reproduce

• Add an operation manually through a custom ModelBuilder (due to [2.0] OperationModelBuilder does not register complex types #651).
• Add something like the following code to your Model:

            //var statement = modelBuilder.Action("GetSalesPlanStatement")
            //    .Returns<SalesPlanStatement>();
            //statement.Parameter<SalesTargets>("targets");

• Add the GetSalesPlanStatement operation and tag it with [Operation].

Expected Rresult

Only one Operation should be registered with the model.

Actual Result

Two Operations are registered with the model.