Class: MeasurementsPresenter

Inherits:
Object
  • Object
show all
Defined in:
app/presenters/measurements_presenter.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(measurements) ⇒ MeasurementsPresenter

Returns a new instance of MeasurementsPresenter.



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# File 'app/presenters/measurements_presenter.rb', line 4

def initialize(measurements)
  @measurements = measurements
end

Instance Attribute Details

#measurements ⇒ Object (readonly)

Returns the value of attribute measurements.



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# File 'app/presenters/measurements_presenter.rb', line 2

def measurements
  @measurements
end

Instance Method Details

#to_json(*args) ⇒ Object 



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# File 'app/presenters/measurements_presenter.rb', line 8

def to_json(*args)
  Houston.benchmark "[#{self.class.name.underscore}] Render JSON" do
    query = measurements.select(<<-SQL)
      taken_at "timestamp",
      name,
      value,
      json_build_object('type', subject_type, 'id', subject_id) "subject"
    SQL

    ActiveRecord::Base.connection.select_value("select array_to_json(array_agg(row_to_json(t))) from (#{query.to_sql}) t")
  end
end