gistfile1.txt

class Pyramid extends Spine.Model
  @configure "Pyramid"
  @hasMany "rows", "models/row"

  constructor: (rowCount) ->
    throw new Error("Row count needs to be more than one") unless rowCount > 1
    (@rows().create y, row) for row, y in @createRows(rowCount)

  createRows: (rowCount) ->
    rows = []

    # Construct the bottom row
    rows[rowCount - 1] = (@_random 1, 10 for x in [0...rowCount])

    # Now go up the pyramid working out the rest of the numbers
    getCellValue = (rowIdx, x) -> rows[rowIdx + 1][x] + rows[rowIdx + 1][x + 1]
    for rowIdx in [rowCount - 2..0]
      rows[rowIdx] = (getCellValue rowIdx, x for x in [0..rowIdx])

    rows

class Row extends Spine.Model
  @configure "Row", "y"
  @hasMany "cells", "models/cell"
  @belongsTo "pyramid", "Pyramid"

  constructor: (@y, values) ->
    (@cells().create(x, value)) for value, x in values

class Cell extends Spine.Model
  @configure "Cell", "value", "x"
  @belongsTo "pyramid", "Pyramid"

  constructor: (@x, @value) ->