method

schema

v3.0.9 - Show latest stable - 0 notes - Class: ActiveResource::Base

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What's this?

schema(&block) public

Creates a schema for this resource - setting the attributes that are known prior to fetching an instance from the remote system.

The schema helps define the set of known_attributes of the current resource.

There is no need to specify a schema for your Active Resource. If you do not, the known_attributes will be guessed from the instance attributes returned when an instance is fetched from the remote system.

example: class Person < ActiveResource::Base

schema do
  # define each attribute separately
  attribute 'name', :string

  # or use the convenience methods and pass >=1 attribute names
  string  'eye_colour', 'hair_colour'
  integer 'age'
  float   'height', 'weight'

  # unsupported types should be left as strings
  # overload the accessor methods if you need to convert them
  attribute 'created_at', 'string'
end

end

p = Person.new p.respond_to? :name # => true p.respond_to? :age # => true p.name # => nil p.age # => nil

j = Person.find_by_name(‘John’) # <person><name>John</name><age>34</age><num_children>3</num_children></person> j.respond_to? :name # => true j.respond_to? :age # => true j.name # => ‘John’ j.age # => ‘34’ # note this is a string! j.num_children # => ‘3’ # note this is a string!

p.num_children # => NoMethodError

Attribute-types must be one of:

string, integer, float

Note: at present the attribute-type doesn’t do anything, but stay tuned… Shortly it will also cast the value of the returned attribute. ie: j.age # => 34 # cast to an integer j.weight # => ‘65’ # still a string!

Show source

# File activeresource/lib/active_resource/base.rb, line 308
      def schema(&block)
        if block_given?
          schema_definition = Schema.new
          schema_definition.instance_eval(&block)

          # skip out if we didn't define anything
          return unless schema_definition.attrs.present?

          @schema ||= {}.with_indifferent_access
          @known_attributes ||= []

          schema_definition.attrs.each do |k,v|
            @schema[k] = v
            @known_attributes << k
          end

          schema
        else
          @schema ||= nil
        end
      end

schema

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