AMS, API, RAILS and a developer, a Love Story

AMS, API, RAILS
and a developer
LOVE
STORY

make the modern
web what it is
API

João Moura
co-founder at Gioco
@joaomdmoura
gioco.pro

AMS, API, RAILS
and a developer

largest city in the Americas
the most populous city of the
southern hemisphere

Bad Relationships
No Background Job

Bad Architecture
Bad Relationships
No Background Job

Bad Architecture
Bad Relationships
Indexes Missing
No Background Job

Bad Architecture
No Cache at all
Bad Relationships
Indexes Missing
No Background Job

APIapplication programming interface

in·ter·face
/ˈin(t)ərˌfās/

in·ter·face
/ˈin(t)ərˌfās/
a point where two systems meet and interact.

ONE OF THE
GREATEST
liabilities

Good API
Performance
Scalability
Reusability
Evolvability
Documentation
Easy to learn
Easy to use
Hard to misuse

An API should do one
thing, and do it well.“ Joshua Blonch, Google tech talk, Jan 2007

why
Rails
is the best tool!
It’s not

why
Rails
is the best tool!
It’s not
But it’s a great one

Performance
Scalability
Reusability
Evolvability
Documentation
Easy to learn
Easy to use
Hard to misuse

Performance
Scalability
Reusability
Evolvability
Documentation
Easy to learn
Easy to use
Hard to misuse
}

Conventions
Performance
Scalability
Reusability
Evolvability
Documentation
Easy to learn
Easy to use
Hard to misuse
}

rails-api
Subset of a normal Rails application, created for
applications that don't require all functionality of
a complete Rails application

Bringing Convention over
Conﬁguration to your JSON
AMS

class PostSerializer < ActiveModel::Serializer
attributes :title, :body, :comments_count
def comments_count
object.comments.size
end
end

{
id: 1,
title: "ZOMG an amazing post",
body: "Indeed, my friend",
comments_count: 5
}

1. Adapters Pattern
Adapters describe how attributes and
relationships should be serialized.

{
"links": {"self": "http://example.com/p
"next": "http://example.com/po
"last": "http://example.com/po
},
"data": [{"type": "posts","id": "1","title": "JSON API paints my bi
"author": {"self": "http://example.com/
"related": "http://example.c
"linkage": { "type": "people
},
"comments": {"self": "http://example.com/p
"related": "http://example.co
"linkage": [{ "type": "comments", "id":
{ "type": "comments", "id":
]
}
}
}],
"included": [{"type": "people","id": "9","first-name": "Dan","last-name": "Gebhardt",
"twitter": "dgeb","links": {"self": "http://example.com/people/
}
}, {
"type": "comments","id": "5","body": "First!","links": {"self": "http://example.com/comments/
}
}, {
"type": "comments","id": "12","body": "I like XML better",
"links": {"self": "http://example.com/comments/12
}
}]
}

2. JSONAPI
{
},
},
]
}
}
}],
}
}, {
}
}, {
}
}]
}

2. JSONAPI
A standard for building
APIs in JSON.
{
},
},
]
}
}
}],
}
}, {
}
}, {
}
}]
}

3. Cache
New implementation, optimised and following
Rails conventions

attributes :title, :body
end

cache
end

cache key: 'post'
end

cache key: 'post', expires_in: 3.hours
end

class PostsController < ApplicationController
def index
@posts = Post.all
render json: @posts
end
end

class PostsController < ApplicationController
def index
@posts = Post.all
render json: @posts
end
def show
@post = Post.find(params[:id])
render json: @post
end
end

4. Fragment Cache
Rails conventions to cache speciﬁc attributes

def title
"Post - #{object.title}"
end
def comments_count
end
end

def title
end
def comments_count
end

def title
end
def comments_count
end
cacheable

def title
end
def comments_count
end
cacheable
non-cacheable

cache only: [:title]
def title
end
def comments_count
end
end

cache except: [:comments_count]
def title
end
def comments_count
end
end

cache key: 'post', expires_in: 3.hours, only: [:title]
end

In god we trust…
all others bring data

0.9.x
42.680000user
system
total
real
17.630000
60.310000
71.201321

0.9.x 0.10.0
real 71.201321 63.926189

0.9.x 0.10.0
real 71.201321 57.851192

WIP
fetch multi
benchmark
and more…

AMS, API, RAILS and a developer, a Love Story

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