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![Couchrest Example
CouchRest example using couchrest gem
require 'couchrest'
# Connect / create to the database
server = CouchRest.new("http://localhost:5984")
db = server.create_db('my-db')
# Save documents
db.save({'_id' => 'my-doc', 'will-exist' => 'here'})
# Get documents
doc = db.get('my-doc'); doc['will-exist'] #=> 'here'
db.delete(doc)](https://image.slidesharecdn.com/2011-04-couchdb-110409200513-phpapp02/85/CouchDB-A-NoSQL-database-6-320.jpg)
![Couchrest Example
CouchRest example using couchrest gem
require 'couchrest'
# Connect / create to the database
server = CouchRest.new("http://localhost:5984")
db = server.create_db('my-db')
# Save documents
db.save({'_id' => 'my-doc', 'will-exist' => 'here'})
# Get documents
doc = db.get('my-doc'); doc['will-exist'] #=> 'here'
db.delete(doc)](https://image.slidesharecdn.com/2011-04-couchdb-110409200513-phpapp02/75/CouchDB-A-NoSQL-database-6-2048.jpg)
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CouchDB: A NoSQL database
CouchDB is a NoSQL database that stores data as JSON documents. It can be accessed via HTTP and uses a RESTful API. Documents are schema-free and the database supports replication and scaling to handle thousands of requests per second. Views allow pre-calculated queries on the database using JavaScript map-reduce functions. Ruby libraries like CouchRest make it easy to interact with CouchDB from Ruby applications. The document recommends using CouchDB as the primary data store and web server, with Ruby handling background tasks rather than the full application logic, and using JavaScript frameworks for the frontend.
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CouchDB: A NoSQL database
- 1. Couch DB aNoSql database Federico Ramallo
- 2. About me Railsdeveloper Ruby mentor Certified Scrum Master Motorcyclist Co-founder of Tangosource.
- 3. What is couchdb? JSON document server Accesible ONLY via HTTP RESTful JSON API is schema free Distributed, supports replication Scales a LOT Can take 2k request / second VS Ruby that can take 15/20 request / second
- 4. How to querythe database? What is a View? Is a pre calculated query on the database using map reduce Use javascript functions example of a map function function(doc) { if(doc.date && doc.title) { emit(doc.date, doc.title); } } This is a map function that allows you to filter by all records that has a title field. a.k.a filter by record type Is schema free, so could use a type field or NOT
- 5. How to useit with ruby? There are several rubygems couchrest https://rubygems.org/gems/couchrest couch_potato https://github.com/langalex/couch_potato couch_foo https://github.com/georgepalmer/couch_foo couchDB-Ruby http://rubyforge.org/projects/couchdb/ The more they try to abstract from couch, the less powerfull they are. I recommend couchrest because: Is light Is simillar to couch api
- 6. Couchrest Example CouchRest exampleusing couchrest gem require 'couchrest' # Connect / create to the database server = CouchRest.new("http://localhost:5984") db = server.create_db('my-db') # Save documents db.save({'_id' => 'my-doc', 'will-exist' => 'here'}) # Get documents doc = db.get('my-doc'); doc['will-exist'] #=> 'here' db.delete(doc)
- 7. How you coulduse it for big applications Move couchdb as a web server Use Ruby for everything else hanging for the _changes feed Use js to interact. Why? Because is super fast Because the browser can have the info locally
- 8. Use JS frameworksfor the frontend! Examples: Backbone.js Sproutcore Capuccino Titanum Ext.js The new model is: Browser - Couchdb - Ruby
- 9. What about ruby? Use it as backend to run background tasks like: Sending emails Authentication
- 10.