Don't trigger update in _get_expression with gurobi (#121)

Avoid an infinite recursion
opencobra · Aug 7, 2017 · f74c447 · f74c447
1 parent 8c2c88b
commit f74c447
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/optlang/gurobi_interface.py b/optlang/gurobi_interface.py
@@ -360,8 +360,9 @@ def _get_expression(self):
         if self.problem is not None and self._expression_expired and len(self.problem._variables) > 0:
             grb_obj = self.problem.problem.getObjective()
             terms = []
+            variables = self.problem._variables
             for i in range(grb_obj.size()):
-                terms.append(grb_obj.getCoeff(i) * self.problem.variables[grb_obj.getVar(i).getAttr('VarName')])
+                terms.append(grb_obj.getCoeff(i) * variables[grb_obj.getVar(i).getAttr('VarName')])
             expression = symbolics.add(terms)
             # TODO implement quadratic objectives
             self._expression = expression + getattr(self.problem, "_objective_offset", 0)