Lasso and Couchdb : the happy couple

#LDC2014 / @stickbyatlas

curl -X POST http://lasso.couchappy.com/ldc2014

-d '{"type":"attendee","name":"Ari","surname":"Najarian"}'

-H 'Content-Type: application/json'

While we're taking our break, do me a favour and type this into your Terminal:(swap your name & surname for mine)


Lasso & CouchDBThe happy couple.

PRESENTER: Ari Najarian • @stickbyatlas


If I don’t include this slide, I’m probably going to forget to introduce myself.

INTRODUCTION


If I don’t include this slide, I’m probably going to forget to introduce myself.

If you have a question or a comment, I’ll be monitoring Twitter!

INTRODUCTION


I’ll be posting my slide deck online after the presentation. Look for a link to it on my Twitter stream.

INTRODUCTION


What I hope to cover:CouchDB overviewDemo & orientationDesign documentsLasso usage patternsIntegrating CouchDBAdvanced Features

INTRODUCTION


I’ve provided further reading for most of the topics I discuss. You can find these links on Delicious:delicious.com / stickbyatlas / LDC2014

INTRODUCTION


A short history ofmy experience withrelational databases.

INTRODUCTION


Microsoft AccessINTRODUCTION


MySQL

INTRODUCTION


PostgreSQL

INTRODUCTION


Filemaker Server

INTRODUCTION


SQLite

INTRODUCTION


Relational databases suck at being easy to use.

Evidence: buggy tooling, obtuse configuration, and the fact that ORMs are an

actual thing people use in basically every web language.

INTRODUCTION


Lasso’s Inline tag(and Ke’s Datasource)make interacting with

relational databases easy.( This is a huge selling point! )

INTRODUCTION


But what if I told you there was an easier way

to persist data in your app?


Introducing CouchDB

Let’s unpack this description a bit.

DOWNLOAD AT: couchdb.apache.org


INTRODUCING COUCHDB

It's noSQLWhat's this mean?


INTRODUCING COUCHDB

JSON for documents


INTRODUCING COUCHDB

Javascript for Map / Reduce indexesThey're basically query expressions!


INTRODUCING COUCHDB

HTTP for an API (!!)


INTRODUCING COUCHDB

CouchDB can do master-master

replication


INTRODUCING COUCHDB

It powers some prettyawesome products.


INTRODUCING COUCHDB

It has enterprise backing.


INTRODUCING COUCHDB

It's concurrent &highly available

CAP Theorem: A & P, not C


INTRODUCING COUCHDB

It has an ecosystem!

PouchDB , Couchbase Lite


A quick orientation

Demo time!


Anatomy of adesign document


{id : "_design/attendees"

}

ANATOMY OF A DESIGN DOC


{id : "_design/attendees",views : {attendee_by_surname : function( doc ){ ... }

}}



{id : "_design/attendees",shows : {view_attendee : function( doc , req ){ ... }edit_attendee : function( doc , req ){ ... }

},views : {attendee_by_surname : function( doc ){ ... }

}}



{id : "_design/attendees",lists : {attendee_cards : function( head , req ){ ... }

},shows : {view_attendee : function( doc , req ){ ... }edit_attendee : function( doc , req ){ ... }

},views : {attendee_by_surname : function( doc ){ ... }

}}



{id : "_design/attendees",updates : {toggle_CLD : function(doc, req){ ... }

}, lists : {attendee_cards : function( head , req ){ ... }


},views : {attendees_by_surname : function( doc ){ ... }

}}



{id : "_design/attendees",validate_doc_update : function( doc, prev , req ){ ... },updates : {toggle_CLD : function(doc, req){ ... }

}, lists : {attendee_cards : function( head , req ){ ... }


},views : {attendees_by_surname : function( doc ){ ... }

}}



Basic usage patterns


Write a document to the database

BASIC USAGE PATTERNS


Retrieve a document as a native Lasso map


local("doc") = json_deserialize( include_url( "http://127.0.0.1:5984/database/DOC_ID" ));


local("products") = json_deserialize( include_url( "http://127.0.0.1:5984/database/_design/ddoc/_view/products" ))->find("rows")->asstaticarray;

#products = with( p in products select #p->find( "value" ) );

Retrieve an array of maps from a view


// VIEW: _design/ddoc/_view/productsfunction( doc ){ if( doc.type == "product" ) emit( doc.product_name , doc );}


Update a document using an update handler.

/_design/attendees/_update/toggle_CLD


Display pre-formatted data with a show function

/_design/attendees/_show

/DEMO_DOC{ "_id": "DEMO_DOC", "type": "attendee", "name": "Ari", "surname" : "Najarian"}


Display pre-formatted data from a list function

/_design/attendees/_list/attendee_cards

/_design/attendees/_view/attendees_by_surname


Cache & serve images via a Lasso proxy



<img src="/file/doc_id/attachment.jpg" />

Stream attachments from database


RewriteRule ^/file/(.*) http://127.0.0.1:5984/database/$1 [P]


How might you adoptCouchDB into yourdevelopment team?


The integration continuum

MOSTLY LASSO

MOSTLYCOUCHDB


THE INTEGRATION CONTINUUM

Authentication



Document Validation



Templating



File uploads



Real-time applications


Advanced features& capabilities


ADVANCED FEATURES

Geospatial queriesGeoCouch by Volker Mische ( @vmx )

Point & bounding-box coordinates


ADVANCED FEATURES

Full-text searchCouchDB Lucene


ADVANCED FEATURES

ClusteringBigCouch


ADVANCED FEATURES

Offline-first development


The big pictureEveryone else is trying to do this now.


MongoDB-like querying syntaxBigCouch merge

Upcoming releases:


CouchDB will challengeyour notions of what databases

can and should do.


Further reading:

delicious.com / stickbyatlas / LDC2014


Questions?

Lasso and Couchdb : the happy couple

Technology

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