I want to record all chapters sections paragraphs of a book according to their tree-like parent-child relationship That is a book has many chapters each chapter has many sections each section has many

Yes, MongoDB is a suitable choice for storing and querying hierarchical data like the one you described. MongoDB's document-based model allows for flexible and nested structures, which can represent the parent-child relationship between chapters, sections, and paragraphs.

You can organize your data as follows:

1. Create a collection for the book, where each document represents a chapter.
2. Each chapter document can have an array field containing section documents.
3. Each section document can have an array field containing paragraph documents.

Here's an example structure in JSON:

{
  "_id": "chapter_id",
  "name": "Chapter 1",
  "sections": [
    {
      "_id": "section_id",
      "name": "Section 1",
      "paragraphs": [
        {
          "_id": "paragraph_id",
          "content": "Paragraph 1"
        },
        {
          "_id": "paragraph_id",
          "content": "Paragraph 2"
        }
      ]
    },
    {
      "_id": "section_id",
      "name": "Section 2",
      "paragraphs": [
        {
          "_id": "paragraph_id",
          "content": "Paragraph 3"
        }
      ]
    }
  ]
}

Using MongoDB's query language, you can perform various queries to find chapters, sections, and paragraphs based on different criteria, such as names or contents. For example:

• To find a chapter by name: db.book.findOne({ "name": "Chapter 1" })
• To find a section by contents: db.book.findOne({ "sections.paragraphs.content": "Paragraph 3" }, { "sections.$": 1 })

Remember to index your data appropriately to optimize the performance of your queries