Ecosyste.ms: Awesome

An open API service indexing awesome lists of open source software.

Awesome Lists | Featured Topics | Projects

https://github.com/vasilakisfil/simpleams

Fast modern plain Ruby serializers using zero dependencies
https://github.com/vasilakisfil/simpleams

rails ruby serializer

Last synced: 5 days ago
JSON representation

Fast modern plain Ruby serializers using zero dependencies

Awesome Lists containing this project

README 

        
[![Build Status](https://travis-ci.org/vasilakisfil/SimpleAMS.svg?branch=master)](https://travis-ci.org/vasilakisfil/SimpleAMS)



# SimpleAMS

> "Simple things should be simple and complex things should be possible." Alan Kay.



If we want to interact with modern APIs we should start building modern, flexible libraries

that help developers to build such APIs. Modern Ruby serializers, as I always wanted them to be.



You can find the core ideas, the reasoning behind the architecture, use cases

and examples [here](https://vasilakisfil.social/blog/2020/01/20/modern-ruby-serializers/).



## Table of contents



1. [Installation](#installation)

2. [Usage](#usage)

    * [Simple case](#simple-case)

        - [Rendering a resource](#rendering-a-resource)

        - [Rendering a collection](#rendering-a-collection)

    * [Serializer DSL](#serializer-dsl)

        - [fields directive](#fields-directive)

        - [Relations (has_many/has_one/belongs_to)](#relations-has_manyhas_onebelongs_to)

            * [relations are recursive](#relations-are-recursive)

            * [embedded content (again recursive)](#embedded-content-again-recursive)

            * [relation name/type](#relation-nametype)

        - [value-hashmap type of directives](#value-hashmap-type-of-directives)

            * [adapter](#adapter)

            * [primary_id](#primary_id)

            * [type](#type)

        - [name-value-hashmap type of directives](#name-value-hashmap-type-of-directives)

            * [link](#link)

            * [meta](#meta)

            * [form](#form)

            * [generic](#generic)

            * [group of link/meta/form/generic](#group-of-linksmetasformsgenerics)

        - [collection directive](#collection-directive)

    * [Rendering DSL](#rendering-dsl)

        - [includes vs relations](#includes-vs-relations)

        - [Rendering collections](#rendering-collections)

        - [Rendering options with values](#rendering-options-with-values)

        - [Exposing methods inside the serializer, like helpers](#exposing-methods-inside-the-serializer-like-helpers)

    * [Extended DSL show off](#extended-dsl-show-off)

3. [Development](#development)

4. [Contributing](#contributing)



## Installation



Add this line to your application's Gemfile:



```ruby

gem 'simple_ams'

```



And then execute:



    $ bundle



Or install it yourself as:



    $ gem install simple_ams



## Usage

The gem's interface has been inspired by ActiveModel Serializers 0.9.2,

0.10.stable, jsonapi-rb and Ember Data.

However, it has been built for POROs, **has zero dependencies** and does not

relate to Rails in any case other than some nostalgia for the (advanced at that

time) pre-0.10 ActiveModel Serialiers.



You can find the core ideas, the reasoning behind the architecture, use cases and examples [here](https://vasilakisfil.social/blog/2020/01/20/modern-ruby-serializers/).



### Simple case

You will rarely need all the advanced options. Usually you will have something like that:



```ruby

class UserSerializer

  include SimpleAMS::DSL



  #specify the adapter we want to use

  adapter SimpleAMS::Adapters::JSONAPI



  #specify the attributes we want to serialize from the given object

  attributes :id, :name, :email, :created_at, :role



  #specify the type of the resource

  type :user

  #specify the name of the collection

  collection :users



  #specify a relation. Here microposts serves as both a name of the collection

  #and the name of the method used to retrieve the values of the collection

  #from the given object

  has_many :microposts

end

```



#### Rendering a resource

Then you can just feed your serializer with data:



```ruby

SimpleAMS::Renderer.new(user).to_json

```

`to_json` first calls `as_json`, which creates a ruby Hash and then `to_json` is called

on top of that hash.



If you want to filter the available options (defined by the serializer) when you

instantiate the serializer, `Renderer` accepts an options hash. In there you can

throw pretty much the same DSL:



```ruby

SimpleAMS::Renderer.new(user, {

  serializer: UserSerializer, fields: [:id, :name, :email], includes: []

}).to_json

```



Here we say that we only want 3 specific fields, and no relations at all.



#### Rendering a collection

Rendering a collection is pretty similar, meaning that it reuses the same serializer

class, and accepts the same runtime options. The only difference is that you need

to call a different class.



```ruby

SimpleAMS::Renderer::Collection.new(users, {

  serializer: UserSerializer, fields: [:id, :email, :name], includes: []

}).to_json

```



### Serializer DSL

The serializer is a very robust, yet simple, with a hash-based internal

representation.



#### fields directive

Fields specify the attributes that the serializer will hold.

The values of each attribute is taken by the to-be serialized object,

unless the serializer has a method of the same name.



```ruby

fields :id, :name, :email, :created_at, :role

```



Using `attributes` is also valid, it’s just an [alias](https://github.com/vasilakisfil/SimpleAMS/blob/master/lib/simple_ams/dsl.rb#L130-L137) after all:



```ruby

attributes :id, :name, :email, :created_at, :role

```



Of course, any field can be overridden by defining a method of the same name

inside the serializer.

In there, you can have access to a method called object which holds the actual

resource to be serialized:



```ruby

def name

  "#{object.first_name} #{object.last_name}"

end

```



#### Relations (has_many/has_one/belongs_to)

These directives allows you to append relations in a resource.

`has_one` is just an alias of `belongs_to` since there is no real difference in

APIs (although internally and in adapters, SimpleAMS knows if you specified the

relation using`belongs_to` or `has_one`, making it future proof in case API specs

decide to support each one in a different way).



```ruby

has_many :microposts

```



Again, it can be overridden by defining a method of the same name:



```ruby

def microposts

  Post.where(user_id: object.id).order(:created_at, :desc).limit(10)

end

```



##### relations are recursive

The relations directives can take the same options as the rendering.



```ruby

#overriding the serializer

has_many :microposts, serializer: CustomPostsSerializer

#overriding the serializer and fields that should be included

has_many :microposts, serializer: CustomPostsSerializer, fields: [:content]

#overriding the serializer, fields and relations that should be included

has_many :microposts, serializer: CustomPostsSerializer, fields: [:content],

  includes: []

#overriding the serializer, fields, relations and links

has_many :microposts, serializer: CustomPostsSerializer, fields: [:content],

  includes: [], links: [:self]

```



When overriding from the relations directives (or when rendering in general) you

are able to override any directive defined in the serializer to acquire a subset

**but never a superset**.



##### embedded content (again recursive)

Sometimes, an annoying spec might define parts of a relation in the main body,

while parts of the relation somewhere else. For instance, JSON:API does that by

having some links in the main body and the rest in the included section.

That’s also possible if you pass a block in the relation directive:



```ruby

has_many :microposts, serializer: MicropostsSerializer, fields: [:content] do

  #these goes to a class named `Embedded`, attached to the relation

  link :self, ->(obj){ "/api/v1/users/#{obj.id}/relationships/microposts" }

  link :related, ->(obj){ ["/api/v1/users/1", rel: :user] }

end

```



Inside that block, you can pass any parameter the original DSL supports and will

be stored in an Embedded class under MicropostsSerializer.

Btw SimpleAMS is smart enough (one of the very few cases that acts like that) to

figure out that if a lambda returns something that’s not an array, then this must

be the value, while options are just empty.



##### relation name/type

Sometimes, we want to detach the relation’s name from the type. In the previous

example `microposts` is the relation name (whatever that means), while the type

is defined by the `MicropostsSerializer`, unless we override it, which can be

done either in the relation serializer itself, or when we use the relation from

the parent serializer:



```ruby

has_many :microposts, serializer: MicropostsSerializer, fields: [:content], type: :feed do

  link :self, ->(obj){ "/api/v1/users/#{obj.id}/relationships/microposts" }

  link :related, ->(obj){ ["/api/v1/users/1", rel: :user] }

end

```



Internally SimpleAMS, differentiates type from name, and usually type is

something that’s semantically stronger (like a relation type) than name.

You can even inject the name of the relation using the name option:



```ruby

has_many :microposts, serializer: MicropostsSerializer, fields: [:content], type: :feed, name: :posts do

  link :self, ->(obj){ "/api/v1/users/#{obj.id}/relationships/microposts" }

  link :related, ->(obj){ ["/api/v1/users/1", rel: :user] }

end

```



As I said, the name, which is usually the name of the attribute that includes

the relation in the JSON format, doesn’t really have any semantic meaning in

most specs. At least I haven’t seen any spec to depend on the root attribute

name of the relation. Instead it’s the type that’s important, because type is

what the [web linking RFC defines](https://tools.ietf.org/html/rfc8288#section-2).



#### value-hashmap type of directives

These are directives like adapter. They take a value, and optionally a hashmap,

which are options to be passed down straight to the adapter, hence they are adapter specific.

Such options are `primary_id`, `type` and `adapter`



For instance, for adapter it could be:

```ruby

adapter SimpleAMS::Adapters::JSONAPI, root: true

```



Of course, since we are talking about Ruby here, it would be a huge restriction

to not allow dynamic value/hashmap combination. Basically any such directive

can accept a lambda (generally anything that responds to `call`) and should

return an array where the first part is the value and (optionally) the second part is the

options. There is an argument that is passed down to the function/lambda, and

that’s the actual object. For instance, to support polymorphic resources you

can have the type dynamic:



```ruby

type ->(obj, s){ obj.employee? ? [:employee, {}] : [:user, {}]}

```



One of the very few times that SimpleAMS acts smart is inside the lambda, that

if you have only a value (not an Array), it will take that as the value, while

the options will be taken by the second argument, after the lambda. So the

above is equivalent with:



```ruby

type ->(obj, s){ obj.employee? ? :employee : :user}, {}

```



Note: you shouldn't use that in case of adapter, as that's the definition of UB :P



adapter



Specifies the adapter to be used. The `adapter` method is the only one that does

not support lambda as it's value, as that would be the definition of undefined

behavior. If you want to support polymorphic collections, you should use the `type`

instead in combination with the `serializer`.



```ruby

#without options

adapter SimpleAMS::Adapters::JSONAPI

#with adapter-specific options

adapter SimpleAMS::Adapters::JSONAPI, {root: false}

```



Note that you can even specify your own adapter. Usually you will want to inherit

from an existing adapter (like `SimpleAMS::Adapters::AMS`), but that's not a

requirement. All you need is to duck type to 2 methods:

* `initialize(document, options = {})` be able to accept 2 arguments when your adapter

  is instantiated. The first one is a document, while the second one is the adapter-specific

  options (like the `{root: false}`.

* `as_json` method returns that returns the hash representation of the serialized result



The conversion of a Hash into raw JSON string is out of the scope of this library.

But you will probably want to use the fastest implementation possible like [oj](https://github.com/ohler55/oj).



primary_id



Specifies the `primary_id` to be used. There are many API specs that handle the

identifier of a resource in a different way than the rest of the attributes.

JSON:API is one of those.



```ruby

#without options

primary_id :id

#with adapter-specific options

adapter :id, {external: true}

#dynamic

adapter ->(obj, s) { [obj.class.primary_key, {}]}

```



type



Specifies the `type` to be used. There are many API specs that handle the

type of a resource in a different way than the rest of the attributes.

JSON:API is one of those.



```ruby

#without options

type :user

#with adapter-specific options

type :user, {polymorphic: false}

#dynamic

type ->(obj, s){ obj.employee? ? [:employee, {}] : [:user, {}]}

```



#### name-value-hashmap type of directives

These are similar to the above, only that they also have an actual value, which

is converted to a representation through the adapter.

Such options are `link`, `meta`, `form` and the most generic directive `generic`.



For instance, think about a links. According to RFC [8288](https://tools.ietf.org/html/rfc8288#section-2), a link has



* a link context,

* a link relation type,

* a link target, and

* optionally, target attributes



Now, if we wanted to translate that to our serializers, a link could look like:

```ruby

link :feed, '/api/v1/me/feed', {style: :compact}

```



Here obviously the link context is the serializer itself, the link relation is

the feed, and the value is `/api/v1/me/feed`. Now you might say, feed should be

the name of the link which is different from the relation type.

The relation type could be `microposts`.

And actually, that’s the case for [JSONAPI v1.1](https://jsonapi.org/format/1.1/).

In that case, the feed should be treated barely as a name (whatever that means)

and relation type will be put inside the link options like:



```ruby

link :feed, '/api/v1/me/feed', {rel: :microposts, style: :compact}

```



Note however that this needs to be supported by the adapter you are using.



Similar to the case of value-hash directives, it is possible to have dynamic

value and options:



```ruby

#values can be dynamic through lambdas

#lambdas take arguments the object to be serialized and the instantiated serializer

link :feed, ->(obj, s) { [s.api_v1_user_feed_path(user_id: obj.id), {rel: :feed} }

#if the value inside the lambda is single (no array), the options will be taken from

#the second argument, after the lambda. So the above is equivelent to:

link :feed, ->(obj, s) { s.api_v1_user_feed_path(user_id: obj.id) }, rel: :feed

```



link



Specifies a link to be used. There are many API specs that handle the links of a

resource in a special way (JSON:API is one of those).

You can specify multiple links, as long as each link name is unique.



```ruby

#specifying a link with without options

link :feed, "/api/v1/feed"

#specifying a link with options

link :feed, "/api/v1/feed", {rel: :feed, compact: true}

#values can be dynamic through lambdas

#lambdas take arguments the object to be serialized and the instantiated serializer

link :feed, ->(obj, s) { [s.api_v1_user_feed_path(user_id: obj.id), {rel: :feed, compact: true}] }

#if the value inside the lambda is single (no array), the options will be taken from

#the second argument, after the lambda. So the above is equivelent to:

link :feed, ->(obj, s) { s.api_v1_user_feed_path(user_id: obj.id) }, rel: :feed, compact: true

```



meta



Specifies a meta to be used. There are many API specs that handle the metas of a

resource in a special way (JSON:API is one of those).

You can specify multiple metas, as long as each link name is unique.



```ruby

#specifying a meta with without options

meta :total_count, 1

#specifying a meta with options

meta :total_count, 1, {compact: true}

#values can be dynamic through lambdas

#lambdas take arguments the object to be serialized and the instantiated serializer

#in this case an object is apparently a collection/array

meta :total_count, ->(obj, s) { [obj.count, {compact: true}] }

#if the value inside the lambda is single (no array), the options will be taken from

#the second argument, after the lambda. So the above is equivelent to:

meta :total_count, ->(obj, s) { obj.count }, {compact: true}

```



form



Specifies a form to be used. Unfortunately, there are very few API specs that

handle forms (the [Ion hypermedia type](https://ionspec.org) is one of those).

You can specify multiple forms, as long as each link name is unique.



```ruby

#specifying a form with without options

form :upload, {method: :get, url: "/api/v1/submit"}

#specifying a form with options

form :upload, {method: :get, url: "/api/v1/submit"}, compact: true

#values can be dynamic through lambdas

#lambdas take arguments the object to be serialized and the instantiated serializer

form :upload, ->(obj, s) { [obj.class.upload_form_options, {compact: true}] }

#if the value inside the lambda is single (no array), the options will be taken from

#the second argument, after the lambda. So the above is equivelent to:

form :upload, ->(obj, s) { obj.class.upload_form_options }, {compact: true}

```



generic



Specifies a generic to be used. A generic is just a placeholder for extensions

that are unknown to SimpleAMS (but maybe they make a lot of sense to you ^_^)



```ruby

#specifying a generic with without options

generic :pagination, :extended

#specifying a form with options

generic :pagination, :extended, compact: false

#values can be dynamic through lambdas

#lambdas take arguments the object to be serialized and the instantiated serializer

generic :pagination, ->(obj, s) { [obj.class.pagination_type, {compact: false}] }

#if the value inside the lambda is single (no array), the options will be taken from

#the second argument, after the lambda. So the above is equivelent to:

generic :pagination, ->(obj, s) { obj.class.pagination_type }, {compact: false}

```



##### group of links/metas/forms/generics



Each of the aforementioned options comes with a plural form as well.

For instance, if we want to specify multiple `links` at the same time:



```ruby

links {

  self: ['/api/v1/me', {rel: :user}]

  feed: ['/api/v1/me/feed', {rel: :feed}]

}

```



or if we want to specify multiple `metas`:

```ruby

metas {

  total_count: ->(obj){ obj.count }

  pages: ->(obj){ obj.pages_count }

}

```



Same goes for `forms` and `generics`.



#### collection directive

SimpleAMS has a unique ability to allow you specify different options when you are

rendering a collection. In its most simple use case it specified the plural name

of the resource, used when rendering a collection:



```ruby

collection :users

```



It’s needed, if your adapter serializes the collection using a root element.

But it can do much more than that: it allows you to define directives on the

collection level. For instance, if you want to have a link that should be

applied **only** to the collection level and not to each resource of the collection,

then you need to define it inside the collection’s block:



```ruby

collection :users do

  link :self, "/api/v1/users"

end

```



Or if we also want to have the total count of the collection, that should go in

there actually:



```ruby

collection :users do

  link :self, "/api/v1/users"

  meta :count, ->(collection, s) { collection.count }

end

```



Again, inside that block you can define using the regular DSL, whatever you

would define in the resource level. It’s just yet another level of recursion

since, the same things that I show you here can be applied in the collection

level inside the block. For instance, in theory (and if the adapter supports

it), you can specify relations that apply only to the collection level:



```ruby

class UserSerializer

  include SimpleAMS::DSL



  adapter SimpleAMS::Adapters::JSONAPI



  attributes :id, :name, :email, :created_at, :role



  type :user

  collection :users do

    link :self, "/api/v1/users"

    meta :count, ->(collection, s) { collection.count }



    has_one :s3_uploader #whatever that means :P

  end



  has_many :microposts

end

```



### Rendering DSL

When rendering a resource, it should be straightforward:



```ruby

SimpleAMS::Renderer.new(user, { serializer: UserSerializer }).to_json

```



All you need is to specify a serializer. In the example above, the resulted

resource is a reflection of what is defined inside the serializer.

However, the serializer acts as a filtering mechanism, meaning that you can

override anything the serializer defines, given that the result creates a

**subset and not a superset** (any superset options will be ignored).



For instance, you can override the type during rendering:



```ruby

SimpleAMS::Renderer.new(user, {

  serializer: UserSerializer, type: :person

}).to_json

```

or you can override the relations, and specify that you don’t want to include

any relation defined in the serializer:



```ruby

SimpleAMS::Renderer.new(user, {

  serializer: UserSerializer, includes: []

}).to_json

```



or specify exactly what fields you want:



```ruby

SimpleAMS::Renderer.new(user, {

  serializer: UserSerializer, fields: [:id, :email, :name, :created_at]

}).to_json

```



or even specify the links subset that you want:



```ruby

SimpleAMS::Renderer.new(user, {

  serializer: UserSerializer, fields: [:id, :email, :name, :created_at],

  links: [:self, :comments, :posts]

}).to_json

```



and the list goes on.. basically the rendering DSL is identical



#### includes vs relations

There might be some confusion between `includes` and `relations`, so to clear things up:

* `includes`: specifies which relations you want to include, out of the available relations.

* `relations`: specifies the available relations, so it's not just an array of

  symbols, but rather full relation objects which are generated through the dsl.

  The raw representation of relations is an array of objects where each object

  is `[relation_type, name, options, embedded_options]`. Here

   `relation_type` is the type of the relation (`has_many`, `belongs_to` etc),

   `name` is the name of the relation (like users), `options`, any relation options,

   and `embedded_options` relevant to embedded options.



So when rendering, if you don't want any relations at all, the correct way is to

specify `includes: []`. In practice you can use `relations: []` as well, but that

will mean that the serializer has no relations at all (takes precedence over

`includes`). But that's not the correct way to do it. For instance, thing about

another scenario: you want to specify only one relation, the `feed` relation.

With `includes` you would have `includes: [:feed]`. With relations, you would

have to specify the relation at runtime (

`relations: [[:has_one, :feed, {serializer: FeedSerializer, fields: [:id, :content]}, {}]]`

) and then also specify that you only want that: `includes: [:feed]`.



In general, there is no reason why you should use `relations` at rendering time,

instead you should leave that to the serializer, and only specify the `includes`.



Btw you might have noticed `includes` only as a rendering option, but SimpleAMS

DSL is used all over the place, and actually it's a serializer option as well

(just that it's not very useful ^_^).



#### Rendering collections

Rendering a collection is similar, only that you need to call

`SimpleAMS::Renderer::Collection` instead of just `SimpleAMS::Renderer`:



```ruby

SimpleAMS::Renderer::Collection.new(users, {

  serializer: UserSerializer, fields: [:id, :email, :name, :created_at],

  links: [:self, :comments, :posts]

}).to_json

```



Note that even with collection, by default everything goes to the resource.

If you need to specify options for the collection itself, you need to use the

collection key. For instance, having some metas inside the collection:



```ruby

SimpleAMS::Renderer::Collection.new(users, {

  serializer: UserSerializer, fields: [:id, :email, :name, :created_at],

  links: [:self, :comments, :posts],

  collection: {

    metas: [:total_count]

  }

}).to_json

```



#### Rendering options with values

If you want to specify the actual values when rendering the resource, rather

than taking into account the serializer, you can inject a hashmap:



```ruby

SimpleAMS::Renderer::Collection.new(users, {

  serializer: UserSerializer, fields: [:id, :email, :name, :created_at],

  links: [:self, :comments, :posts],

  collection: {

    metas: {

      total_count: users.count,

  }

}).to_json

```



Of course, you can also pass a lambda there, but not sure what’s the point since

the lambda parameter is the resource that you already try to render so it’s not

going to give you anything more (and will be slower actually).



#### Exposing methods inside the serializer, like helpers

When rendering you can expose a couple of objects in the serializer:



```ruby

SimpleAMS::Renderer::Collection.new(users, {

  serializer: UserSerializer, fields: [:id, :email, :name, :created_at],

  #exposing helpers that will be available inside the serializer

  expose: {

    #a class

    current_user: User.first

    #or a module

    helpers: CommonHelpers

  },

}).to_json

```



The expose attribute is also available through DSL, although usually that’s not

very useful. Just wanted to mentions that there is actually parity on everything,

since everything has been built on the same building blocks :)



### Extended DSL show off

Here is an extended example of the DSL. It's not a real use case of course, but

shows what's possible with SimpleAMS and its powerful DSL.



```ruby

{

  #the primary id of the record(s), used mostly by the underlying adapter (like JSONAPI)

  primary_id: :id,

  #the type of the record, used mostly by the underlying adapter (like JSONAPI)

  type: :user,

  #which relations should be included

  includes: [:posts, videos: [:comments]],

  #which fields for each relation should be included

  fields: [:id, :name, posts: [:id, :text], videos: [:id, :title, comments: [:id, :text]]] #overrides includes when association is specified

  relations: [

    [:belongs_to, :company, {

        serializer: CompanySerializer,

        fields: Company.column_names.map(&:to_sym)

      }

    ],

    [:has_many, :followers, {

        serializer: UserSerializer,

        fields: User.column_names.map(&:to_sym)

      }

    ],

  ]

  #the serializer that should be used

  #makes sense to use it when initializing the Renderer

  serializer: UserSerializer,

  #can also be a lambda, in case of polymorphic records, ideal for ArrayRenderer

  serializer: ->(obj, s){ obj.employee? ? EmployeeSerializer : UserSerializer }

  #specifying the underlying adapter. This cannot be a lambda in case of ArrayRenderer,

  #but can take some useful options that are passed down straight to the adapter class.

  adapter: SimpleAMS::Adapters::AMS, root: true

  #the links data

  links: {

    #can be a simple string

    root: '/api/v1'

    #a string with some options (relation and target attributes as defined by RFC8288

    #however, you can also pass adapter-specific attributes

    posts: "/api/v1/posts/", rel: :posts,

    #it can also be a lambda that takes the resource to be rendered as a param

    #when the lambda is called, it should return the array structure above

    self: ->(obj, s) { ["/api/v1/users/#{obj.id}", rel: :user] }

  },

  #the meta data, same as the links data (available in adapters even for single records)

  metas: {

    type: ->(obj, s){ obj.employee? ? :employee : :user}

    #meta can take arbitrary options as well

    authorization: :oauth, type: :bearer_token

  },

  #the form data, same as the links/metas data (available in adapters even for single records)

  forms: {

    update: ->(obj, s){ User::UpdateForm.for(obj)}

    follow: ->(obj, s){ User::FollowForm.for(obj)}

  },

  #collection parameters, used only in ArrayRenderer

  collection: {

    links: {

      root: '/api/v1'

    },

    metas: {

      pages: ->(obj, s) { [obj.pages, collection: true]},

      current_page: ->(obj, s) { [obj.current_page, collection: true] },

      previous_page: ->(obj, s) { [obj.previous_page, collection: true] },

      next_page: ->(obj, s) { [obj.next_page, collection: true] },

      max_per_page: 50,

    },

    #creating a resource goes in the collection route (users/), hence inside collection options ;)

    forms: {

      create: ->(obj){ User::CreateForm.for(obj)}

    },

  }

  #exposing helpers that will be available inside the seriralizer

  expose: {

    #a class

    current_user: User.first

    #or a module

    helpers: CommonHelpers

  },

}

```



## Development



After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake spec` to run the tests. You can also run `bin/console` for an interactive prompt that will allow you to experiment.



To install this gem onto your local machine, run `bundle exec rake install`. To release a new version, update the version number in `version.rb`, and then run `bundle exec rake release`, which will create a git tag for the version, push git commits and tags, and push the `.gem` file to [rubygems.org](https://rubygems.org).



## Contributing

But reports are very welcome at https://github.com/vasilakisfil/SimpleAMS. Please add as much info as you can (serializer and Renderer input)

so that we can easily track down the bug.



Pull requests are also very welcome on GitHub at https://github.com/vasilakisfil/SimpleAMS.

However, to keep the code's sanity (AMS I am looking to you), **I will be very picky** on the code style and design,

to match (my) existing code characteristics.

Because at the end of the day, it's gonna be me who will maintain this thing.