Class: DbFuel::Modeling::AttributeRendererSet

Inherits:
Object
  • Object
show all
Defined in:
lib/db_fuel/modeling/attribute_renderer_set.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: []) ⇒ AttributeRendererSet

Returns a new instance of AttributeRendererSet.

Raises:

  • (ArgumentError) 


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

def resolver
  @resolver
end

Instance Method Details

#created_at_timestamp_attribute ⇒ Object 



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# File 'lib/db_fuel/modeling/attribute_renderer_set.rb', line 63

def created_at_timestamp_attribute
  timestamp_attribute(CREATED_AT)
end

#make_renderers(attributes) ⇒ Object 



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# File 'lib/db_fuel/modeling/attribute_renderer_set.rb', line 49

def make_renderers(attributes)
  Burner::Modeling::Attribute
    .array(attributes)
    .map { |a| Burner::Modeling::AttributeRenderer.new(a, resolver) }
end

#timestamp_attribute(key) ⇒ Object 



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# File 'lib/db_fuel/modeling/attribute_renderer_set.rb', line 71

def timestamp_attribute(key)
  Burner::Modeling::Attribute.make(
    key: key,
    transformers: [
      { type: NOW_TYPE }
    ]
  )
end

#timestamp_created_attribute_renderers ⇒ Object

Adds the attributes for created_at and updated_at to the currrent attribute renderers.



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# File 'lib/db_fuel/modeling/attribute_renderer_set.rb', line 32

def timestamp_created_attribute_renderers
  timestamp_attributes = [created_at_timestamp_attribute, updated_at_timestamp_attribute]

  timestamp_attributes.map do |a|
    Burner::Modeling::AttributeRenderer.new(a, resolver)
  end + attribute_renderers
end

#timestamp_updated_attribute_renderers ⇒ Object

Adds the attribute for updated_at to the currrent attribute renderers.



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# File 'lib/db_fuel/modeling/attribute_renderer_set.rb', line 41

def timestamp_updated_attribute_renderers
  timestamp_attributes = [updated_at_timestamp_attribute]

  timestamp_attributes.map do |a|
    Burner::Modeling::AttributeRenderer.new(a, resolver)
  end + attribute_renderers
end

#transform(attribute_renderers, row, time) ⇒ Object 



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# File 'lib/db_fuel/modeling/attribute_renderer_set.rb', line 55

def transform(attribute_renderers, row, time)
  attribute_renderers.each_with_object({}) do |attribute_renderer, memo|
    value = attribute_renderer.transform(row, time)

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

#updated_at_timestamp_attribute ⇒ Object 



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# File 'lib/db_fuel/modeling/attribute_renderer_set.rb', line 67

def updated_at_timestamp_attribute
  timestamp_attribute(UPDATED_AT)
end