lib/dry/swagger/struct_parser.rb in dry-swagger-0.4.1 vs lib/dry/swagger/struct_parser.rb in dry-swagger-0.4.2

@@ -108,11 +108,15 @@
       def visit_enum(node, opts = {})
         visit(node[0], opts)
       end
 
       def visit_sum(node, opts = {})
-        opts[:nullable] = true
-        visit(node[1], opts)
+        if node[0][0].equal?(:constrained)
+          opts[:nullable] = true
+          visit(node[1], opts) # ignore NilClass constrained
+        elsif node[0][0].equal?(:struct)
+          visit(node[0], opts) # grab left operand, this means if you have it defined as DTO1 | DTO2, it will grab DTO1
+        end
       end
 
       def visit_struct(node, opts = {})
         opts[:member] = true
 
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