Tree structures: Parent References

• What are "parent" references?

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  • A special property "parent"
  • Stores the _id of the document one level up in the tree

• Why use parent references?

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  • Used to navigate tree-structured or hierarchical data

• How do you implement parent references in MongoDB?

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  • When you save a document, include a "parent" property
    which stores the _id of the level above