Class: Remi::Transform::Nvl

Inherits:
Remi::Transform show all
Defined in:
lib/remi/transform.rb

Overview

Public: (Next-Value-Lookup) transform used to find the first non-blank value in a list.

default - What to use if all values are blank (default: '').

Examples:

Nvl.new.to_proc.call(nil,'','a','b') # => "a"

Instance Attribute Summary

Attributes inherited from Remi::Transform

#multi_args, #source_metadata, #target_metadata

Instance Method Summary collapse

Methods inherited from Remi::Transform

#call, #to_proc

Constructor Details

#initialize(default = '', *args, **kargs, &block) ⇒ Nvl

Returns a new instance of Nvl.



186
187
188
189
190
 
# File 'lib/remi/transform.rb', line 186

def initialize(default='', *args, **kargs, &block)
  super
  @multi_args = true
  @default = default
end

Instance Method Details

#transform(row) ⇒ Object 



192
193
194
195
 
# File 'lib/remi/transform.rb', line 192

def transform(row)
  row = SourceToTargetMap::Row[row]
  row.each_source.find(->() { [nil, @default] }) { |key, value| !value.blank? }[1]
end