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examples/o2mrecur/README.md

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+# Tree O2M Relation
+
+In this example, we have a recursive O2M relation between tree's nodes and their children (or their parent).  
+Each node in the tree **has many** children, and **has one** parent. If node A adds B to its children,
+B can get its owner using the `owner` edge.
+
+### Generate Assets
+
+```console
+go generate ./...
+```
+
+### Run Examples
+
+```console
+go test
+```