Class: Freelancer::Support::JSONMapper

Inherits:
Object
  • Object
show all
Defined in:
lib/freelancer/support/json_mapper.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(model) ⇒ JSONMapper

Initialize the JSON mapper



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# File 'lib/freelancer/support/json_mapper.rb', line 9

def initialize(model)
  @model = model
  @mappings = {}
end

Instance Attribute Details

#mappings ⇒ Object (readonly)

Returns the value of attribute mappings.



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# File 'lib/freelancer/support/json_mapper.rb', line 6

def mappings
  @mappings
end

#model ⇒ Object (readonly)

Returns the value of attribute model.



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# File 'lib/freelancer/support/json_mapper.rb', line 5

def model
  @model
end

Instance Method Details

#from_json(json) ⇒ Object

Populate the fields of the model by mapping the JSON data structure specified against the model attributes.



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# File 'lib/freelancer/support/json_mapper.rb', line 45

def from_json(json)
  
  json.each_pair do |key, value|
    
    # If our value is a hash and it's mapped by the mapper,
    # do a special hash lookup on the map target
    # for each of the key+nested key combinations
    if value.is_a?(Hash) && mapped_as_hash?(key)

      value.each_pair do |nested_key, nested_value|
        map_key = mapped_from({ key => nested_key })
        raise ArgumentError.new("Unable to map key #{{ key => nested_key }.inspect} to model attribute") if map_key.nil?
        model[map_key] = nested_value
      end
      
    else
      map_key = mapped_from(key)
      raise ArgumentError.new("Unable to map key #{key} to model attribute") if map_key.nil?
      model[map_key] = value
    end
  

  end
  
  model
            
end

#map(from, to) ⇒ Object

Map a key against the given model value



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# File 'lib/freelancer/support/json_mapper.rb', line 15

def map(from, to)
  @mappings[from] = to
end

#to_json ⇒ Object

Build a JSON data structure of the current mapping according to the format specifications from the Freelancer.com API.



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# File 'lib/freelancer/support/json_mapper.rb', line 21

def to_json
  
  # Build a Hash of the current mappings
  structure = {}
  mappings.each_pair do |from, to|
    
    # If our "to" is a hash, build a nested hash into the structure
    if to.is_a?(Hash)
      
      structure[to.keys.first] ||= {}
      structure[to.keys.first][to.values.first] = model[from]
      
    else
      structure[to] = model[from]
    end

  end
  
  structure

end