Class: OutroRails::CagedController

Inherits:
ApplicationController show all
Includes:
InvalidParamsRedirectable, RootSelectable
Defined in:
app/controllers/outro_rails/caged_controller.rb

Defined Under Namespace

Classes: ChordEntry

Constant Summary collapse

DEFAULT_SHAPE = 
"c"

Constants included from RootSelectable

RootSelectable::DEFAULT_ROOT

Instance Method Summary collapse

Instance Method Details

#show ⇒ Object 



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# File 'app/controllers/outro_rails/caged_controller.rb', line 20

def show
  @root = root_from_params
  @letter = permitted!(
    (params[:shape].presence || DEFAULT_SHAPE).to_s.upcase,
    Instruments::Guitar::ChordShapes::CAGED_LETTERS,
    "shape"
  )

  @guitar = Instruments::Guitar.new
  @prefer = @root.accidental_offset.negative? ? :flats : :sharps

  @entries = Instruments::Guitar::ChordShapes
    .chords_for_letter(@letter)
    .map do |quality, extension, shape|
      positions = Instruments::Guitar::ChordShapes.positions(
        shape,
        @root,
        guitar: @guitar
      )

      ChordEntry.new(
        quality: quality,
        extension: extension,
        shape: shape,
        symbol: Theory::ChordVocabulary.symbol(
          root_name: @root,
          quality: quality,
          extension: extension
        ),
        positions: positions,
        root_positions: positions.select do |string, fret|
          @guitar.pitch_class_at(string, fret) == @root.pitch_class
        end
      )
    end
end