Home›MongoDB in 5 Days›Day 5
Day 5 of 5
⏱ ~60 minutes
MongoDB in 5 Days — Day 5

Atlas and Mongoose

MongoDB Atlas for production, Mongoose for Node.js with schemas, validation, and populate.

MongoDB Atlas Setup

Atlas setup
# 1. Sign up at mongodb.com/atlas (free tier = 512MB)
# 2. Create a cluster (M0 = free)
# 3. Create a database user
# 4. Add your IP to the allowlist
# 5. Get connection string:
# mongodb+srv://user:[email protected]/mydb
Mongoose Schema and Model
npm install mongoose

import mongoose from 'mongoose';
await mongoose.connect(process.env.MONGODB_URI);

const postSchema = new mongoose.Schema({
  title: { type: String, required: true, trim: true, maxlength: 200 },
  body: { type: String, required: true },
  author: { type: mongoose.Schema.Types.ObjectId, ref: 'User', required: true },
  tags: [String],
  published: { type: Boolean, default: false },
  createdAt: { type: Date, default: Date.now },
});

postSchema.index({ title: 'text' });

export const Post = mongoose.model('Post', postSchema);
Mongoose CRUD and populate
// Create
const post = await Post.create({
  title: 'Hello',
  body: 'World',
  author: userId
});

// Read with populate (join)
const posts = await Post.find({ published: true })
  .populate('author', 'name email')  // only name and email
  .sort('-createdAt')
  .limit(20);

// Update
await Post.findByIdAndUpdate(id, { $set: { published: true } }, { new: true });

// Delete
await Post.findByIdAndDelete(id);
📝 Day 5 Exercise
Move to MongoDB Atlas
  1. C
  2. r
  3. e
  4. a
  5. t
  6. e
  8. a
  10. f
  11. r
  12. e
  13. e
  15. A
  16. t
  17. l
  18. a
  19. s
  21. c
  22. l
  23. u
  24. s
  25. t
  26. e
  27. r
  28. .
  30. C
  31. o
  32. n
  33. n
  34. e
  35. c
  36. t
  38. y
  39. o
  40. u
  41. r
  43. N
  44. o
  45. d
  46. e
  47. .
  48. j
  49. s
  51. a
  52. p
  53. p
  55. t
  56. o
  58. i
  59. t
  60. .
  62. V
  63. e
  64. r
  65. i
  66. f
  67. y
  69. d
  70. a
  71. t
  72. a
  74. p
  75. e
  76. r
  77. s
  78. i
  79. s
  80. t
  81. s
  83. a
  84. f
  85. t
  86. e
  87. r
  89. r
  90. e
  91. s
  92. t
  93. a
  94. r
  95. t
  96. i
  97. n
  98. g
  100. y
  101. o
  102. u
  103. r
  105. l
  106. o
  107. c
  108. a
  109. l
  111. s
  112. e
  113. r
  114. v
  115. e
  116. r
  117. .
  119. A
  120. d
  121. d
  123. a
  125. M
  126. o
  127. n
  128. g
  129. o
  130. o
  131. s
  132. e
  134. s
  135. c
  136. h
  137. e
  138. m
  139. a
  141. w
  142. i
  143. t
  144. h
  146. v
  147. a
  148. l
  149. i
  150. d
  151. a
  152. t
  153. i
  154. o
  155. n
  157. —
  159. t
  160. e
  161. s
  162. t
  164. t
  165. h
  166. a
  167. t
  169. i
  170. t
  172. r
  173. e
  174. j
  175. e
  176. c
  177. t
  178. s
  180. i
  181. n
  182. v
  183. a
  184. l
  185. i
  186. d
  188. d
  189. a
  190. t
  191. a
  192. .

Day 5 Summary

  • Atlas free tier (M0) = 512MB storage, no credit card required. Good for development.
  • Mongoose schemas add structure and validation to MongoDB's flexible documents.
  • populate() performs a join: replaces ObjectId references with the actual documents.
  • ref: 'User' in the schema tells Mongoose which model to use for populate.
→
← Previous
Day 4: Indexes and Performance
Course Complete
Back to MongoDB in 5 Days
→
Finished this lesson?