Module: Parametric::Struct::ClassMethods

Defined in:
lib/parametric/struct.rb

Constant Summary collapse

PLURAL_END = 
/s$/.freeze

Instance Method Summary collapse

Instance Method Details

#__class_name(key) ⇒ Object 



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# File 'lib/parametric/struct.rb', line 133

def __class_name(key)
  key.to_s.split('_').map(&:capitalize).join.sub(PLURAL_END, '')
end

#build(attrs) ⇒ Object 



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# File 'lib/parametric/struct.rb', line 102

def build(attrs)
  attrs.each_with_object({}) do |(k, v), obj|
    obj[k] = wrap(k, v)
  end
end

#new!(attrs = {}) ⇒ Object

Raises:



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# File 'lib/parametric/struct.rb', line 57

def new!(attrs = {})
  st = new(attrs)
  raise InvalidStructError.new(st) unless st.valid?
  st
end

#parametric_after_define_schema(schema) ⇒ Object

this hook is called after schema definition in DSL module



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# File 'lib/parametric/struct.rb', line 64

def parametric_after_define_schema(schema)
  schema.fields.values.each do |field|
    if field.meta_data[:schema]
      case field.meta_data[:schema]
      when Parametric::Schema
        klass = Class.new do
          include Struct
        end
        klass.schema = field.meta_data[:schema]
        self.const_set(__class_name(field.key), klass)
        klass.parametric_after_define_schema(field.meta_data[:schema])
      when Array
        # Handle one_of fields: create multiple struct classes, one for each possible schema
        # This allows the field to instantiate the appropriate nested struct based on which schema validates
        classes = field.meta_data[:schema].map.with_index(1) do |sc, idx|
          klass = Class.new do
            include Struct
          end
          klass.schema = sc
          class_name = "#{__class_name(field.key)}#{idx}"
          self.const_set(__class_name(class_name), klass)
          klass.parametric_after_define_schema(sc)
          klass
        end
        self.const_set(__class_name(field.key), classes)
      else
        self.const_set(__class_name(field.key), field.meta_data[:schema])
      end
    end

    self.class_eval <<-RUBY, __FILE__, __LINE__ + 1
      def #{field.key}
        _graph[:#{field.key}]
      end
    RUBY
  end
end

#wrap(key, value) ⇒ Object 



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# File 'lib/parametric/struct.rb', line 108

def wrap(key, value)
  case value
  when Hash
    # find constructor for field
    cons = self.const_get(__class_name(key))
    case cons
    when Class # Single nested struct
      cons.new(value)
    when Array # Array of possible nested structs (one_of)
      # For one_of fields: instantiate all possible struct classes and return the first valid one
      # This allows the struct to automatically choose the correct nested structure based on the data
      structs = cons.map{|c| c.new(value) }
      structs.find(&:valid?) || structs.first
    else
      value.freeze
    end
  when Array
    value.map{|v| wrap(key, v) }.freeze
  else
    value.freeze
  end
end