From 7b0f3b3d5611c72ed7456e5d7b97e4577ec7ce1a Mon Sep 17 00:00:00 2001
From: Kibaek Kim <kibaek.k@gmail.com>
Date: Tue, 8 Sep 2020 11:19:09 -0500
Subject: [PATCH] fixed #82

---
 src/StructJuMP.jl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/StructJuMP.jl b/src/StructJuMP.jl
index 7cb77c6..81b96e3 100644
--- a/src/StructJuMP.jl
+++ b/src/StructJuMP.jl
@@ -300,7 +300,7 @@ end
 function JuMP.constraints_string(print_mode, model::StructuredModel)
     strings = String[]
     # Sort by creation order, i.e. ConstraintIndex value
-    constraints = sort(collect(model.constraints), by = c -> c.first.value)
+    constraints = sort(collect(model.constraints), by = c -> c.first)
     for (index, constraint) in constraints
         push!(strings, JuMP.constraint_string(print_mode, constraint))
     end