Class: BBLib::PathHash

Inherits:
BasicObject
Defined in:
lib/hash_path/path_hash.rb

Overview

Wraps a hash in a PathHash object which allows ActiveRecord-like access to hash parameters. For example, methods are treated as keys passed in to Hash’s [] method and ._ can be used to indicate that the next element should be searched for recursively.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(hash) ⇒ PathHash

Returns a new instance of PathHash.



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# File 'lib/hash_path/path_hash.rb', line 18

def initialize(hash)
  @hash = hash
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(arg, formula = nil) ⇒ Object

Does not fall back on super as ALL input is accepted



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# File 'lib/hash_path/path_hash.rb', line 50

def method_missing(arg, formula = nil)
  arg = (@recursive ? "..#{arg}" : arg.to_s) +
        (formula ? "(#{formula})" : '')
  if @hash.is_a?(::Array)
    PathHash.new @hash.flat_map { |h| if h.is_a?(::Array) || h.is_a?(::Hash) then h.hash_path(arg) end }
  else
    PathHash.new @hash.hpath(arg)
  end
end

Instance Attribute Details

#hash ⇒ Object (readonly)

Returns the value of attribute hash.



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# File 'lib/hash_path/path_hash.rb', line 16

def hash
  @hash
end

#recursive ⇒ Object (readonly)

Returns the value of attribute recursive.



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# File 'lib/hash_path/path_hash.rb', line 16

def recursive
  @recursive
end

Instance Method Details

#[](val) ⇒ Object 



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# File 'lib/hash_path/path_hash.rb', line 22

def [](val)
  PathHash.new(@hash.map { |h| h[val] })
end

#_ ⇒ Object 



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# File 'lib/hash_path/path_hash.rb', line 40

def _
  @recursive = true
  self
end

#_fval ⇒ Object Also known as: _f 



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# File 'lib/hash_path/path_hash.rb', line 32

def _fval
  @hash.first
rescue
  @hash
end

#_path(arg, formula = nil) ⇒ Object 



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# File 'lib/hash_path/path_hash.rb', line 45

def _path(arg, formula = nil)
  method_missing arg, formula
end

#_val ⇒ Object Also known as: _v 



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# File 'lib/hash_path/path_hash.rb', line 26

def _val
  @hash
end

#respond_to_missing?(*args) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/hash_path/path_hash.rb', line 60

def respond_to_missing?(*args)
  true || super
end