Class: ReeMapper::Mapper

Inherits:
Object
  • Object
show all
Defined in:
lib/ree_lib/packages/ree_mapper/package/ree_mapper/mapper.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(strategies, type) ⇒ Mapper

Returns a new instance of Mapper.



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# File 'lib/ree_lib/packages/ree_mapper/package/ree_mapper/mapper.rb', line 102

def initialize(strategies, type)
  @fields = {}
  @type = type
  @strategies = strategies
  @strategy_methods = strategies.map(&:method)

  strategies.each do |strategy|
    method = strategy.method
    instance_variable_set(:"@#{method}_strategy", strategy)
  end
end

Instance Attribute Details

#fields ⇒ Object (readonly)

Returns the value of attribute fields.



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# File 'lib/ree_lib/packages/ree_mapper/package/ree_mapper/mapper.rb', line 100

def fields
  @fields
end

#strategies ⇒ Object (readonly)

Returns the value of attribute strategies.



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# File 'lib/ree_lib/packages/ree_mapper/package/ree_mapper/mapper.rb', line 100

def strategies
  @strategies
end

#strategy_methods ⇒ Object (readonly)

Returns the value of attribute strategy_methods.



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# File 'lib/ree_lib/packages/ree_mapper/package/ree_mapper/mapper.rb', line 100

def strategy_methods
  @strategy_methods
end

#type ⇒ Object (readonly)

Returns the value of attribute type.



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# File 'lib/ree_lib/packages/ree_mapper/package/ree_mapper/mapper.rb', line 100

def type
  @type
end

Class Method Details

.build(strategies, type = nil) ⇒ Object 



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# File 'lib/ree_lib/packages/ree_mapper/package/ree_mapper/mapper.rb', line 8

def self.build(strategies, type = nil)
  if type
    strategies.each do |strategy|
      method = strategy.method
      next if type.respond_to?(method)

      raise ReeMapper::UnsupportedTypeError, "#{type.class} should implement method `#{method}`"
    end
  end

  klass = Class.new(self)

  klass.instance_eval do
    strategies.each do |strategy|
      method = strategy.method

      if type
        class_eval(<<~RUBY, __FILE__, __LINE__ + 1)
          def #{method}(obj, role: nil, only: nil, except: nil, fields_filters: nil)
            #{
              if type.is_a?(ReeMapper::AbstractWrapper)
                "@type.#{method}(obj, role:, fields_filters:)"
              else
                "@type.#{method}(obj)"
              end
            }
          end
        RUBY
      else
        class_eval(<<~RUBY, __FILE__, __LINE__ + 1)
          def #{method}(obj, role: nil, only: nil, except: nil, fields_filters: nil)
            user_fields_filter = ReeMapper::FieldsFilter.build(only, except)

            if !user_fields_filter.nil?
              fields_filters = if fields_filters.nil?
                [user_fields_filter]
              else
                fields_filters + [user_fields_filter]
              end
            end

            @fields.each_with_object(@#{method}_strategy.build_object) do |(_, field), acc|
              next unless fields_filters.nil? || fields_filters.all? { _1.allow? field.name }
              next unless field.has_role?(role)

              value = if @#{method}_strategy.has_value?(obj, field)
                @#{method}_strategy.get_value(obj, field)
              else
                if !field.optional && !@#{method}_strategy.always_optional
                  raise ReeMapper::TypeError.new(
                    "is missing (required field)",
                    field.location,
                    [field.from_as_str]
                  )
                end

                next unless field.has_default?

                field.default
              end

              if !value.nil? || !field.null
                nested_fields_filters = fields_filters&.filter_map { _1.filter_for(field.name) }

                if field.fields_filter
                  nested_fields_filters = if nested_fields_filters
                    nested_fields_filters + [field.fields_filter]
                  else
                    [field.fields_filter]
                  end
                end

                value = begin
                  field.type.#{method}(value, role:, fields_filters: nested_fields_filters)
                rescue ReeMapper::ErrorWithLocation => e
                  e.prepend_field_name field.name_as_str
                  e.location ||= field.location
                  raise e
                end
              end

              @#{method}_strategy.assign_value(acc, field, value)
            end
          end
        RUBY
      end
    end
  end

  klass.new(strategies, type)
end

Instance Method Details

#add_field(field) ⇒ Object

Raises:



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# File 'lib/ree_lib/packages/ree_mapper/package/ree_mapper/mapper.rb', line 115

def add_field(field)
  raise ArgumentError if field.name.nil?
  @fields[field.name] = field
  nil
end

#dto(strategy_method) ⇒ Object

Raises:



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# File 'lib/ree_lib/packages/ree_mapper/package/ree_mapper/mapper.rb', line 132

def dto(strategy_method)
  strategy = find_strategy(strategy_method)
  raise ArgumentError, "there is no :#{strategy_method} strategy" unless strategy
  strategy.dto
end

#find_strategy(strategy_method) ⇒ Object 



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# File 'lib/ree_lib/packages/ree_mapper/package/ree_mapper/mapper.rb', line 146

def find_strategy(strategy_method)
  strategies.detect { _1.method == strategy_method }
end

#name ⇒ Object 



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# File 'lib/ree_lib/packages/ree_mapper/package/ree_mapper/mapper.rb', line 122

def name
  @name
end

#name=(name) ⇒ Object 



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# File 'lib/ree_lib/packages/ree_mapper/package/ree_mapper/mapper.rb', line 127

def name=(name)
  @name = name
end

#prepare_dto ⇒ Object

Raises:



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# File 'lib/ree_lib/packages/ree_mapper/package/ree_mapper/mapper.rb', line 139

def prepare_dto
  raise ReeMapper::ArgumentError, "mapper should contain at least one field" if fields.empty?
  strategies.each { _1.prepare_dto(fields.keys) }
  nil
end