Trying to save MPS from raw solver and problems with MOI.RawSolver()

Specific Domains Optimization (Mathematical)
2

I guess you need something like:

native_write(model::Model) = native_write(backend(model))
function native_write(model::MOI.Utilities.CachingOptimizer)
    MOI.Utilities.attach_optimizer(model)
    return native_write(model.optimizer)
end
native_write(model::MOI.Bridges.LazyBridgeOptimizer) = native_write(model.model)

function native_write(model::Gurobi.Optimizer)
    # ...
end
function native_write(model::CPLEX.Optimizer)
    # ...
end
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