From f7d11d46bc0768852a9c3f3f548a0d908778919b Mon Sep 17 00:00:00 2001
From: odow <o.dowson@gmail.com>
Date: Fri, 5 Jan 2024 12:09:26 +1300
Subject: [PATCH] Fix dual

---
 src/MOI_wrapper.jl | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/MOI_wrapper.jl b/src/MOI_wrapper.jl
index d821456..6367354 100644
--- a/src/MOI_wrapper.jl
+++ b/src/MOI_wrapper.jl
@@ -1178,6 +1178,17 @@ function MOI.get(
     return _dual_multiplier(model) * rc
 end
 
+function MOI.get(
+    model::Optimizer,
+    attr::MOI.ConstraintDual,
+    ci::MOI.ConstraintIndex{MOI.VariableIndex,MOI.Interval{Float64}},
+)
+    MOI.check_result_index_bounds(model, attr)
+    MOI.throw_if_not_valid(model, ci)
+    rc = model.inner.mult_x_L[ci.value] - model.inner.mult_x_U[ci.value]
+    return _dual_multiplier(model) * rc
+end
+
 ### MOI.NLPBlockDual
 
 function MOI.get(model::Optimizer, attr::MOI.NLPBlockDual)