Building APIs With Rails API 1 

"Why include a bunch of functionality you're not going to use if you're just building a JSON API? " Leigh Halliday 2 

Patricia Luz Bastos Software Engineer at @Codeminer42 3 

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5 Agenda Create application with API mode What is Rails API and AMS? JSON What is API? 

JSON Is a lightweight data-interchange format. It is easy for humans to read and write. It is easy for machines to parse and generate. JSON is a text format that is completely language independent but uses conventions that are familiar to programmers of the C-family of languages, including C, C++, C#, Java, JavaScript, Perl, Python, and many others. These properties make JSON an ideal data-interchange language. 6 

JSON JSON is built on two structures: • A collection of name/value pairs. In various languages, this is realized as an object, record, struct, dictionary, hash table, keyed list, or associative array. • An ordered list of values. In most languages, this is realized as an array, vector, list, or sequence. These are universal data structures. Virtually all modern programming languages support them in one form or another. It makes sense that a data format that is interchangeable with programming languages also be based on these structures. 7 

JSON - EXAMPLE Integer Matrix [ [1,5], [-1,9], [1000,0] ] 8 

JSON - EXAMPLE Object { “Title”: “Json X Xml”, “Resume”: “O Duelo De Dois Modelos De Representação De Informações”, “Year”: 2012, “Gender”: [“Aventura”, “Ação”, “Ficção”] } 9 

JSON - EXAMPLE 10 Array of Objects [{ “Title”: “JSON x XML”, “Resume”: “O Duelo De Dois Modelos De Representação De Informações”, “Year”: 2012, “Gender”: [“Aventura”, “Ação”, “Ficção”] }, { “Title”: “Json James”, “Resume”: “A História De Uma Lenda Do Velho Oeste”, “Year”: 2012, “Gender”: [“Western”] }] 

API Application Programming Interface A set of routines, protocols and tools for building software applications. It is a Interface, a lot tools that permit the Application Programming. 11 

APIs Since 2006 12 

API Examples: - Login with Facebook In Mobile Application. - Payment your buy in ecommerce. - Calculate zip code. 13 

"A decision was made to incorporate Rails API into Rails core . During the last week I’ve been working on this and, today we opened a pull request to discuss the results." Santiago Pastorino - Ruby on Rails Core Team Member 20/Apr/2015 14 

RAILS API RAILS API was made incorporate in Core Rails in version 5. Its usage is in API applications only, where you usually don't need the entire Rails middleware stack nor template generation. 15 

RAILS API - Ruby 2.2 or higher - Rails 5 or higher API mode does is remove functionality that you don’t actually need when building an API. This includes things like sessions, cookies, assets, and really anything related to making Rails work with a browser. 16 

RAILS API 17 It will also change the generators so that it won’t generate views, helpers, and assets when generating a new resource. 

RAILS API 18 

AMS Respond with JSON ActiveModel::Serializer allows you to define which attributes and relationships you would like to include in your JSON response 19 

AMS - EXAMPLE 20 

AMS - EXAMPLE 21 

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Search and Study Cache our JSON serialization in AMS Throttle abusive clients from overloading our API 34 

Off Topic 35 

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Thank You! 43 @patricialuzbast patybastos