diff --git a/src/db/db/gsiDeclDbEdges.cc b/src/db/db/gsiDeclDbEdges.cc
index a14190af9..3c9a36ff8 100644
--- a/src/db/db/gsiDeclDbEdges.cc
+++ b/src/db/db/gsiDeclDbEdges.cc
@@ -373,7 +373,9 @@ static size_t id (const db::Edges *e)
 
 extern Class<db::ShapeCollection> decl_dbShapeCollection;
 
-Class<db::Edges> dec_Edges (decl_dbShapeCollection, "db", "Edges",
+//  NOTE: the Metrics constants are injected into Edges in gsiDeclDbRegion.cc because this is where these constants are instantiated.
+
+Class<db::Edges> decl_Edges (decl_dbShapeCollection, "db", "Edges",
   constructor ("new", &new_v, 
     "@brief Default constructor\n"
     "\n"
@@ -1471,9 +1473,5 @@ Class<db::Edges> dec_Edges (decl_dbShapeCollection, "db", "Edges",
   "This class has been introduced in version 0.23.\n"
 );
 
-//  borrow the Metrics constants from Region:
-extern gsi::EnumIn<db::Region, db::metrics_type> decl_Region_Metrics;
-gsi::ClassExt<db::Edges> inject_Metrics_from_Region_in_Edges (decl_Region_Metrics.defs ());
-
 }
 
diff --git a/src/db/db/gsiDeclDbRegion.cc b/src/db/db/gsiDeclDbRegion.cc
index 1794d6958..c8dbf05fb 100644
--- a/src/db/db/gsiDeclDbRegion.cc
+++ b/src/db/db/gsiDeclDbRegion.cc
@@ -2027,7 +2027,7 @@ Class<db::Region> decl_Region (decl_dbShapeCollection, "db", "Region",
     "\n"
     "@return The transformed region.\n"
   ) +
-  method_ext ("width_check", &width2, gsi::arg ("d"), gsi::arg ("whole_edges", false), gsi::arg ("metrics", db::metrics_type::Euclidian), gsi::arg ("ignore_angle", tl::Variant (), "default"), gsi::arg ("min_projection", tl::Variant (), "0"), gsi::arg ("max_projection", tl::Variant (), "max"), gsi::arg ("shielded", true),
+  method_ext ("width_check", &width2, gsi::arg ("d"), gsi::arg ("whole_edges", false), gsi::arg ("metrics", db::metrics_type::Euclidian, "Euclidian"), gsi::arg ("ignore_angle", tl::Variant (), "default"), gsi::arg ("min_projection", tl::Variant (), "0"), gsi::arg ("max_projection", tl::Variant (), "max"), gsi::arg ("shielded", true),
     "@brief Performs a width check with options\n"
     "@param d The minimum width for which the polygons are checked\n"
     "@param whole_edges If true, deliver the whole edges\n"
@@ -2067,7 +2067,7 @@ Class<db::Region> decl_Region (decl_dbShapeCollection, "db", "Region",
     "\n"
     "The 'shielded' option has been introduced in version 0.27."
   ) +
-  method_ext ("space_check", &space2, gsi::arg ("d"), gsi::arg ("whole_edges", false), gsi::arg ("metrics", db::metrics_type::Euclidian), gsi::arg ("ignore_angle", tl::Variant (), "default"), gsi::arg ("min_projection", tl::Variant (), "0"), gsi::arg ("max_projection", tl::Variant (), "max"), gsi::arg ("shielded", true), gsi::arg ("opposite_filter", db::NoOppositeFilter), gsi::arg ("rect_filter", db::NoSideAllowed),
+  method_ext ("space_check", &space2, gsi::arg ("d"), gsi::arg ("whole_edges", false), gsi::arg ("metrics", db::metrics_type::Euclidian, "Euclidian"), gsi::arg ("ignore_angle", tl::Variant (), "default"), gsi::arg ("min_projection", tl::Variant (), "0"), gsi::arg ("max_projection", tl::Variant (), "max"), gsi::arg ("shielded", true), gsi::arg ("opposite_filter", db::NoOppositeFilter, "NoOppositeFilter"), gsi::arg ("rect_filter", db::NoSideAllowed, "NoSideAllowed"),
     "@brief Performs a space check with options\n"
     "@param d The minimum space for which the polygons are checked\n"
     "@param whole_edges If true, deliver the whole edges\n"
@@ -2108,7 +2108,7 @@ Class<db::Region> decl_Region (decl_dbShapeCollection, "db", "Region",
     "\n"
     "The 'shielded', 'not_opposite' and 'rect_sides' options have been introduced in version 0.27."
   ) +
-  method_ext ("notch_check", &notch2, gsi::arg ("d"), gsi::arg ("whole_edges", false), gsi::arg ("metrics", db::metrics_type::Euclidian), gsi::arg ("ignore_angle", tl::Variant (), "default"), gsi::arg ("min_projection", tl::Variant (), "0"), gsi::arg ("max_projection", tl::Variant (), "max"), gsi::arg ("shielded", true),
+  method_ext ("notch_check", &notch2, gsi::arg ("d"), gsi::arg ("whole_edges", false), gsi::arg ("metrics", db::metrics_type::Euclidian, "Euclidian"), gsi::arg ("ignore_angle", tl::Variant (), "default"), gsi::arg ("min_projection", tl::Variant (), "0"), gsi::arg ("max_projection", tl::Variant (), "max"), gsi::arg ("shielded", true),
     "@brief Performs a space check between edges of the same polygon with options\n"
     "@param d The minimum space for which the polygons are checked\n"
     "@param whole_edges If true, deliver the whole edges\n"
@@ -2148,7 +2148,7 @@ Class<db::Region> decl_Region (decl_dbShapeCollection, "db", "Region",
     "\n"
     "The 'shielded' option has been introduced in version 0.27."
   ) +
-  method_ext ("isolated_check", &isolated2, gsi::arg ("d"), gsi::arg ("whole_edges", false), gsi::arg ("metrics", db::metrics_type::Euclidian), gsi::arg ("ignore_angle", tl::Variant (), "default"), gsi::arg ("min_projection", tl::Variant (), "0"), gsi::arg ("max_projection", tl::Variant (), "max"), gsi::arg ("shielded", true), gsi::arg ("opposite_filter", db::NoOppositeFilter), gsi::arg ("rect_filter", db::NoSideAllowed),
+  method_ext ("isolated_check", &isolated2, gsi::arg ("d"), gsi::arg ("whole_edges", false), gsi::arg ("metrics", db::metrics_type::Euclidian, "Euclidian"), gsi::arg ("ignore_angle", tl::Variant (), "default"), gsi::arg ("min_projection", tl::Variant (), "0"), gsi::arg ("max_projection", tl::Variant (), "max"), gsi::arg ("shielded", true), gsi::arg ("opposite_filter", db::NoOppositeFilter, "NoOppositeFilter"), gsi::arg ("rect_filter", db::NoSideAllowed, "NoSideAllowed"),
     "@brief Performs a space check between edges of different polygons with options\n"
     "@param d The minimum space for which the polygons are checked\n"
     "@param whole_edges If true, deliver the whole edges\n"
@@ -2189,7 +2189,7 @@ Class<db::Region> decl_Region (decl_dbShapeCollection, "db", "Region",
     "\n"
     "The 'shielded', 'not_opposite' and 'rect_sides' options have been introduced in version 0.27."
   ) +
-  method_ext ("inside_check", &inside2, gsi::arg ("other"), gsi::arg ("d"), gsi::arg ("whole_edges", false), gsi::arg ("metrics", db::metrics_type::Euclidian), gsi::arg ("ignore_angle", tl::Variant (), "default"), gsi::arg ("min_projection", tl::Variant (), "0"), gsi::arg ("max_projection", tl::Variant (), "max"), gsi::arg ("shielded", true), gsi::arg ("opposite_filter", db::NoOppositeFilter), gsi::arg ("rect_filter", db::NoSideAllowed),
+  method_ext ("inside_check", &inside2, gsi::arg ("other"), gsi::arg ("d"), gsi::arg ("whole_edges", false), gsi::arg ("metrics", db::metrics_type::Euclidian, "Euclidian"), gsi::arg ("ignore_angle", tl::Variant (), "default"), gsi::arg ("min_projection", tl::Variant (), "0"), gsi::arg ("max_projection", tl::Variant (), "max"), gsi::arg ("shielded", true), gsi::arg ("opposite_filter", db::NoOppositeFilter, "NoOppositeFilter"), gsi::arg ("rect_filter", db::NoSideAllowed, "NoSideAllowed"),
     "@brief Performs an inside check with options\n"
     "@param d The minimum distance for which the polygons are checked\n"
     "@param other The other region against which to check\n"
@@ -2231,7 +2231,7 @@ Class<db::Region> decl_Region (decl_dbShapeCollection, "db", "Region",
     "\n"
     "The 'shielded', 'not_opposite' and 'rect_sides' options have been introduced in version 0.27."
   ) +
-  method_ext ("overlap_check", &overlap2, gsi::arg ("other"), gsi::arg ("d"), gsi::arg ("whole_edges", false), gsi::arg ("metrics", db::metrics_type::Euclidian), gsi::arg ("ignore_angle", tl::Variant (), "default"), gsi::arg ("min_projection", tl::Variant (), "0"), gsi::arg ("max_projection", tl::Variant (), "max"), gsi::arg ("shielded", true), gsi::arg ("opposite_filter", db::NoOppositeFilter), gsi::arg ("rect_filter", db::NoSideAllowed),
+  method_ext ("overlap_check", &overlap2, gsi::arg ("other"), gsi::arg ("d"), gsi::arg ("whole_edges", false), gsi::arg ("metrics", db::metrics_type::Euclidian, "Euclidian"), gsi::arg ("ignore_angle", tl::Variant (), "default"), gsi::arg ("min_projection", tl::Variant (), "0"), gsi::arg ("max_projection", tl::Variant (), "max"), gsi::arg ("shielded", true), gsi::arg ("opposite_filter", db::NoOppositeFilter, "NoOppositeFilter"), gsi::arg ("rect_filter", db::NoSideAllowed, "NoSideAllowed"),
     "@brief Performs an overlap check with options\n"
     "@param d The minimum overlap for which the polygons are checked\n"
     "@param other The other region against which to check\n"
@@ -2273,7 +2273,7 @@ Class<db::Region> decl_Region (decl_dbShapeCollection, "db", "Region",
     "\n"
     "The 'shielded', 'not_opposite' and 'rect_sides' options have been introduced in version 0.27."
   ) +
-  method_ext ("enclosing_check", &enclosing2, gsi::arg ("other"), gsi::arg ("d"), gsi::arg ("whole_edges", false), gsi::arg ("metrics", db::metrics_type::Euclidian), gsi::arg ("ignore_angle", tl::Variant (), "default"), gsi::arg ("min_projection", tl::Variant (), "0"), gsi::arg ("max_projection", tl::Variant (), "max"), gsi::arg ("shielded", true), gsi::arg ("opposite_filter", db::NoOppositeFilter), gsi::arg ("rect_filter", db::NoSideAllowed),
+  method_ext ("enclosing_check", &enclosing2, gsi::arg ("other"), gsi::arg ("d"), gsi::arg ("whole_edges", false), gsi::arg ("metrics", db::metrics_type::Euclidian, "Euclidian"), gsi::arg ("ignore_angle", tl::Variant (), "default"), gsi::arg ("min_projection", tl::Variant (), "0"), gsi::arg ("max_projection", tl::Variant (), "max"), gsi::arg ("shielded", true), gsi::arg ("opposite_filter", db::NoOppositeFilter, "NoOppositeFilter"), gsi::arg ("rect_filter", db::NoSideAllowed, "NoSideAllowed"),
     "@brief Performs an enclosing check with options\n"
     "@param d The minimum enclosing distance for which the polygons are checked\n"
     "@param other The other region against which to check\n"
@@ -2315,7 +2315,7 @@ Class<db::Region> decl_Region (decl_dbShapeCollection, "db", "Region",
     "\n"
     "The 'shielded', 'not_opposite' and 'rect_sides' options have been introduced in version 0.27."
   ) +
-  method_ext ("separation_check", &separation2, gsi::arg ("other"), gsi::arg ("d"), gsi::arg ("whole_edges", false), gsi::arg ("metrics", db::metrics_type::Euclidian), gsi::arg ("ignore_angle", tl::Variant (), "default"), gsi::arg ("min_projection", tl::Variant (), "0"), gsi::arg ("max_projection", tl::Variant (), "max"), gsi::arg ("shielded", true), gsi::arg ("opposite_filter", db::NoOppositeFilter), gsi::arg ("rect_filter", db::NoSideAllowed),
+  method_ext ("separation_check", &separation2, gsi::arg ("other"), gsi::arg ("d"), gsi::arg ("whole_edges", false), gsi::arg ("metrics", db::metrics_type::Euclidian, "Euclidian"), gsi::arg ("ignore_angle", tl::Variant (), "default"), gsi::arg ("min_projection", tl::Variant (), "0"), gsi::arg ("max_projection", tl::Variant (), "max"), gsi::arg ("shielded", true), gsi::arg ("opposite_filter", db::NoOppositeFilter, "NoOppositeFilter"), gsi::arg ("rect_filter", db::NoSideAllowed, "NoSideAllowed"),
     "@brief Performs a separation check with options\n"
     "@param d The minimum separation for which the polygons are checked\n"
     "@param other The other region against which to check\n"
@@ -2562,8 +2562,10 @@ gsi::EnumIn<db::Region, db::metrics_type> decl_Region_Metrics ("db", "Metrics",
   "This enum has been introduced in version 0.27."
 );
 
-//  Inject the Region::Metrics declarations into Region:
+//  Inject the Region::Metrics declarations into Region and Edges:
+//  (Edges injection has to be done here because only here defs() is available)
 gsi::ClassExt<db::Region> inject_Metrics_in_parent (decl_Region_Metrics.defs ());
+gsi::ClassExt<db::Edges> inject_Metrics_in_Edges (decl_Region_Metrics.defs ());
 
 gsi::EnumIn<db::Region, db::RectFilter> decl_Region_RectFilter ("db", "RectFilter",
   gsi::enum_const ("NoRectFilter", db::RectFilter::NoSideAllowed,