constraint: fix error message

Fixes #187

constraint.py

@@ -694,7 +694,7 @@ class Base(with_metaclass(Constraint, object)):
             return getattr(solver.system,name)
         except AttributeError:
             logger.warn('{} not supported in solver "{}"',
-                cstrName(obj),solver.getName())
+                cstrName(obj),solver.system.getName())
 
     @classmethod
     def getEntityDef(cls,elements,checkCount,obj=None):

sys_slvs.py

@@ -33,6 +33,9 @@ class _SystemSlvs(SystemExtension,slvs.System):
         super(_SystemSlvs,self).__init__()
         self.log = log
 
+    def getName(self):
+        return SystemSlvs.getName()
+
     def solve(self, group=0, reportFailed=False, findFreeParams=False):
         ret = super(_SystemSlvs,self).solve(group,reportFailed,findFreeParams)
         if ret:

sys_sympy.py

@@ -1072,6 +1072,9 @@ class _SystemSymPy(SystemExtension):
             name = 'add' + cls.__name__[1:]
             setattr(self,name,cls.make(self))
 
+    def getName(self):
+        return SystemSymPy.getName()
+
     def reset(self):
         self.__init__()