Class: DbFuel::Modeling::RecordTransformer

Inherits:
Object
  • Object
show all
Defined in:
lib/db_fuel/modeling/record_transformer.rb

Overview

Creates attribute renderers based on attributes passed. Also constains methods to transform attribute renderers and include timestamp attributes if needed.

Constant Summary collapse

NOW_TYPE =

:nodoc:

'r/value/now'
CREATED_AT = 
'created_at'
UPDATED_AT = 
'updated_at'

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(resolver:, attributes: []) ⇒ RecordTransformer

Returns a new instance of RecordTransformer.

Raises:

  • (ArgumentError) 


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# File 'lib/db_fuel/modeling/record_transformer.rb', line 22

def initialize(resolver:, attributes: [])
  raise ArgumentError, 'resolver is required' unless resolver

  @resolver            = resolver
  @attribute_renderers = make_renderers(attributes)

  freeze
end

Instance Attribute Details

#attribute_renderers ⇒ Object (readonly)

Returns the value of attribute attribute_renderers.



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# File 'lib/db_fuel/modeling/record_transformer.rb', line 20

def attribute_renderers
  @attribute_renderers
end

#resolver ⇒ Object (readonly)

Returns the value of attribute resolver.



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# File 'lib/db_fuel/modeling/record_transformer.rb', line 20

def resolver
  @resolver
end

Instance Method Details

#transform(row, time, keys: Set.new, created_at: false, updated_at: false) ⇒ Object 



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# File 'lib/db_fuel/modeling/record_transformer.rb', line 31

def transform(row, time, keys: Set.new, created_at: false, updated_at: false)
  dynamic_attributes, all_keys = make_dynamic_attributes(
    keys: keys,
    created_at: created_at,
    updated_at: updated_at
  )

  dynamic_attributes.each_with_object({}) do |attribute_renderer, memo|
    next if all_keys.any? && all_keys.exclude?(attribute_renderer.key)

    value = attribute_renderer.transform(row, time)

    resolver.set(memo, attribute_renderer.key, value)
  end
end