Ruby and MongoDB Web Development

Cover......Page 1
Copyright......Page 3
Credits......Page 4
About the Author......Page 5
Acknowledgement......Page 6
About the Reviewers......Page 7
www.PacktPub.com......Page 8
Table of Contents......Page 10
Preface......Page 20
Chapter 1: Installing MongoDB and Ruby......Page 30
  Using RVM on Linux or Mac OS......Page 31
   The RVM games......Page 35
  Using rbenv for installing Ruby......Page 36
 Installing MongoDB......Page 37
 Starting MongoDB......Page 38
  Understanding JavaScript Object Notation (JSON)......Page 40
   Saving information......Page 41
   Retrieving information......Page 42
  Exporting information using mongoexport......Page 43
  Managing backup and restore using mongodump and mongorestore......Page 44
  Saving large files using mongofiles......Page 45
 Installing Rails/Sinatra......Page 47
 Summary......Page 48
Chapter 2: Diving Deep into MongoDB......Page 50
 Time for action – creating our first document......Page 51
  NoSQL scores over SQL databases......Page 52
 Using MongoDB embedded documents......Page 53
 Time for action – embedding reviews and votes......Page 54
 Using MongoDB document relationships......Page 55
 Time for action – creating document relations......Page 56
 Comparing MongoDB versus SQL syntax......Page 57
  Building the map function......Page 59
  Building the reduce function......Page 60
 Time for action – writing the reduce function to process emitted information......Page 61
 Time for action – creating the project......Page 62
   Why do we need the Bundler......Page 63
 Time for action – start your engines......Page 64
  Setting up Mongoid......Page 65
 Time for action – configuring Mongoid......Page 66
 Time for action – planning the object schema......Page 67
 Time for action – putting it all together......Page 71
  Understanding many-to-many relationships in MongoDB......Page 75
 Time for action – adding reviews to books......Page 76
  Choosing whether to embed or not to embed......Page 77
 Time for action – embedding Lease and Purchase models......Page 78
  Working with Map/Reduce......Page 79
 Time for action – writing the map function to calculate ratings......Page 82
  Using Map/Reduce together......Page 83
 Time for action – working with Map/Reduce using Ruby......Page 84
 Summary......Page 87
Chapter 3: MongoDB Internals......Page 88
 Understanding Binary JSON......Page 89
 Documents and collections......Page 90
 JavaScript and MongoDB......Page 91
 Ensuring write consistency or \"read your writes\"......Page 92
 Global write lock......Page 93
  Implementing optimistic locking in MongoDB......Page 94
 Time for action – implementing optimistic locking......Page 95
 Why are there no joins in MongoDB?......Page 96
 Summary......Page 98
 Searching by fields in a document......Page 100
 Time for action – searching by a string value......Page 101
 Time for action – fetching only for specific fields......Page 103
 Time for action – skipping documents and limiting our search results......Page 105
  Writing conditional queries......Page 106
  Writing threshold queries with $gt, $lt, $ne, $lte, and $gte......Page 107
  Checking presence using $exists......Page 108
 Time for action – searching inside reviews......Page 109
  Searching inside arrays using $in and $nin......Page 110
 Searching inside hashes......Page 111
 Searching with regular expressions......Page 112
 Time for action – using regular expression searches......Page 113
 Summary......Page 116
 Why do we need Ruby DataMappers......Page 118
  The mongo-ruby-driver......Page 119
 Time for action – using mongo gem......Page 120
 The Ruby DataMappers for MongoDB......Page 122
  Configuring MongoMapper......Page 123
 Time for action – configuring MongoMapper......Page 124
 Time for action – setting up Mongoid......Page 126
  Defining fields using MongoMapper......Page 129
 Time for action – creating and updating objects......Page 130
  Using find method......Page 131
  Executing conditional queries using where......Page 132
 Time for action – fetching using the where criterion......Page 133
  Revisiting limit, skip, and offset......Page 134
  Using MongoMapper......Page 135
   Using Mongoid......Page 136
  MongoMapper......Page 137
   Mongoid......Page 138
   Accessing many-to-many relations using Mongoid......Page 139
  The one-to-one relation......Page 140
   Using Mongoid......Page 141
 Time for action – adding book details......Page 142
   Implementing polymorphic relations the correct way......Page 143
 Time for action – managing the driver entities......Page 144
 Time for action – creating vehicles using basic polymorphism......Page 148
  Choosing SCI or basic polymorphism......Page 151
 Using embedded objects......Page 152
  Using Mongoid......Page 153
 Reverse embedded relations in Mongoid......Page 156
 Time for action – using embeds_one without specifying embedded_in......Page 157
 Time for action – using embeds_many without specifying embedded_in......Page 158
 Understanding embedded polymorphism......Page 159
 Time for action – adding licenses to drivers......Page 160
 Time for action – insuring drivers......Page 161
 Choosing whether to embed or to associate documents......Page 163
 Mongoid or MongoMapper – the verdict......Page 164
 Summary......Page 165
 Developing a web application with Mongoid......Page 166
 Time for action – setting up a Rails project......Page 167
  Setting up Sinatra......Page 168
 Time for action – using Sinatra professionally......Page 170
  Understanding Rack......Page 175
 Defining attributes in models......Page 176
  Indexing attributes......Page 177
   Geospatial indexing......Page 178
 Time for action – adding dynamic fields......Page 179
 Time for action – localizing fields......Page 181
 Using arrays and hashes in models......Page 183
  Common options for all relations......Page 184
  Relation-specific options......Page 185
   :as option......Page 186
   :order option......Page 187
  Options for has_and_belongs_to_many......Page 188
   :inverse_of option......Page 189
 Time for action – configuring the many-to-many relation......Page 190
 Time for action – setting up the following and followers relationship......Page 191
 Time for action – setting up cyclic relations......Page 194
  Options for embedded_in......Page 195
   :name option......Page 196
 Time for action – changing models......Page 197
 Mixing in Mongoid modules......Page 198
 Time for action – getting paranoid......Page 199
 Time for action – including a version......Page 201
 Summary......Page 204
Chapter 7: Achieving High Performance on Your Ruby Application with MongoDB......Page 206
 Time for action – enabling profiling for MongoDB......Page 207
 Time for action – explaining a query......Page 209
 Time for action – using covered indexes......Page 212
 Other MongoDB performance tuning techniques......Page 215
  Web server response time......Page 216
   Load the server using httperf......Page 217
   Monitoring server performance......Page 218
  Indexing fields......Page 221
  Performance of the memory-mapped storage engine......Page 222
  Increasing performance of Mongoid using bson_ext gem......Page 223
   Redis server......Page 224
 Summary......Page 225
Chapter 8: Rack, Sinatra, Rails, and MongoDB – Making Use of them All......Page 226
  Setting up the project......Page 227
 Time for action – modeling the Author class......Page 229
 Time for action – writing the Book, Category and Address models......Page 230
 Time for action – modeling the Order class......Page 231
  Understanding Rails routes......Page 232
 Time for action – configuring routes......Page 233
  Understanding the Rails architecture......Page 234
  Processing a Rails request......Page 235
  Coding the Controllers and the Views......Page 236
 Time for action – writing the AuthorsController......Page 237
  Solving the N+1 query problem using the includes method......Page 238
   Relating models without persisting them......Page 239
 Time for action – designing the layout......Page 242
   Understanding the Rails asset pipeline......Page 249
 Time for action – listing authors......Page 250
 Time for action – adding new authors and books......Page 253
 Time for action – setting up Sinatra and Rack......Page 259
 Testing and automation using RSpec......Page 262
 Time for action – installing RSpec......Page 263
 Time for action – sporking it......Page 265
 Documenting code using YARD......Page 266
 Summary......Page 269
Chapter 9: Going Everywhere – Geospatial Indexing with MongoDB......Page 270
 What is geolocation......Page 271
  Converting geolocation to geocoded coordinates......Page 272
 Identifying the exact geolocation......Page 273
 Time for action – geocoding the Address model......Page 274
 Time for action – saving geolocation coordinates......Page 276
 Time for action – using geocoder for storing coordinates......Page 277
 Time for action – finding nearby addresses......Page 279
 Time for action – firing near queries in Mongoid......Page 281
  Differences between $near and $geoNear......Page 282
 Summary......Page 283
Chapter 10: Scaling MongoDB......Page 284
 Time for action – setting up the master/slave replication......Page 285
  Using replica sets......Page 290
 Time for action – implementing replica sets......Page 291
  Adding members to the replica set......Page 296
 Time for action – configuring replica sets for Sodibee......Page 297
 Implementing sharding......Page 302
 Time for action – setting up the shards......Page 303
 Time for action – starting the config server......Page 304
 Time for action – setting up mongos......Page 305
  Testing shared replication......Page 307
 Implementing Map/Reduce......Page 308
 Time for action – planning the Map/Reduce functionality......Page 309
 Time for action – Map/Reduce via the mongo console......Page 310
 Time for action – Map/Reduce via Ruby......Page 312
 Time for action – iterating Ruby objects......Page 314
 Summary......Page 317
Pop Quiz Answers......Page 318
Index......Page 320