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// Assume User and Book models are defined const User = mongoose.model('User', name: String, interests: [String], readingHistory: [String] ); const Book = mongoose.model('Book', title: String, tags: [String] );

// Simple recommendation logic app.get('/recommendations', async (req, res) => try const user = await User.findById(req.query.userId).populate('readingHistory'); const interests = user.interests; const recommendations = await Book.find( tags: $in: interests ); // Basic filtering to not recommend books already read const filteredRecommendations = recommendations.filter(book => !user.readingHistory.includes(book._id)); res.json(filteredRecommendations); catch (err) console.error(err); res.status(500).json( message: 'Error fetching recommendations' ); pdfdrivenet books full

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