Created
August 23, 2019 08:22
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Tree!
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require 'pry' | |
Record = Struct.new(:id, :level_1, :level_2) | |
class Tree | |
class Node | |
def initialize(object, records, behavior) | |
@object = object | |
@records = records | |
@behavior = behavior | |
load_behavior | |
end | |
def nodes | |
raise NotImplementedError | |
end | |
private | |
def load_behavior | |
name = self.class.name.gsub('Tree::', '') | |
return unless @behavior.const_defined?(name) | |
extend(@behavior.const_get(name)) | |
end | |
end | |
class Level1Node < Node | |
def nodes | |
@records.group_by(&:level_2).map do |level_2, nested| | |
Level2Node.new(level_2, nested, @behavior) | |
end | |
end | |
end | |
Level2Node = Class.new(Node) | |
# class methods | |
def initialize(records:, behavior:) | |
@records = records | |
@behavior = behavior | |
end | |
def nodes | |
@records.group_by(&:level_1).map do |level_1, nested| | |
Level1Node.new(level_1, nested, @behavior) | |
end | |
end | |
end | |
module BarBehavior | |
module Level1Node | |
def custom_method | |
['This is: ', @object].join | |
end | |
end | |
module Level2Node | |
def nodes | |
@records.map(&:id) | |
end | |
end | |
end | |
##### TEST | |
records = [ | |
Record.new(1, :foo, :a), | |
Record.new(2, :foo, :a), | |
Record.new(3, :bar, :b) | |
] | |
tree = Tree.new(records: records, behavior: BarBehavior) | |
level1 = tree.nodes.first | |
raise 'Does not work' unless level1.custom_method == 'This is: foo' | |
raise 'Does not work' unless level1.nodes.count == 1 | |
level2 = level1.nodes.first | |
raise 'Does not work' unless level2.nodes == [1, 2] | |
puts 'WORK!' |
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