Class: Nested::Serializer

Inherits:
Object
  • Object
show all
Defined in:
lib/nested/serializer.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(includes = []) ⇒ Serializer

Returns a new instance of Serializer.



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# File 'lib/nested/serializer.rb', line 5

def initialize(includes=[])
  @includes = includes.clone
  @excludes = []
end

Instance Attribute Details

#excludes ⇒ Object

Returns the value of attribute excludes.



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# File 'lib/nested/serializer.rb', line 3

def excludes
  @excludes
end

#includes ⇒ Object

Returns the value of attribute includes.



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# File 'lib/nested/serializer.rb', line 3

def includes
  @includes
end

Instance Method Details

#+(field) ⇒ Object 



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# File 'lib/nested/serializer.rb', line 10

def +(field)
  field = field.is_a?(SerializerField) ? field : SerializerField.new(field, ->{ true })

  @includes << field unless @includes.detect{|e| e.name == field.name}
  @excludes = @excludes.reject{|e| e.name == field.name}
  self
end

#-(field) ⇒ Object 



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# File 'lib/nested/serializer.rb', line 18

def -(field)
  field = field.is_a?(SerializerField) ? field : SerializerField.new(field, ->{ true })

  @excludes << field unless @excludes.detect{|e| e.name == field.name}
  self
end

#serialize ⇒ Object 



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# File 'lib/nested/serializer.rb', line 25

def serialize
  this = self
  ->(obj) do
    obj = ::HashWithIndifferentAccess.new(obj) if obj.is_a?(Hash)

    excludes = this.excludes.select{|e| instance_exec(&e.condition)}

    if obj
      this.includes.reject{|e| excludes.detect{|e2| e2.name == e.name}}.inject({}) do |memo, field|
        if instance_exec(&field.condition)
          case field.name
            when Symbol
              memo[field.name] = obj.is_a?(Hash) ? obj[field.name] : obj.send(field.name)
            when Hash
              field_name, proc = field.name.to_a.first
              memo[field_name] = instance_exec(obj, &proc)
          end
        end
        memo
      end
    else
      nil
    end
  end
end