Class: Realize::Collection::Join

Inherits:
Object
  • Object
show all
Includes:
Arrays
Defined in:
lib/realize/collection/join.rb

Overview

Transformer to return a new string by concatenating all the elements of an array specified by a separator character. The transformer also can be configured to specifiy which elements to start from and end to that will make up the returned string.

Constant Summary collapse

DEFAULT_END_INDEX = 
-1
DEFAULT_SEPARATOR = 
''
DEFAULT_START_INDEX = 
0

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Arrays

#array

Constructor Details

#initialize(separator: DEFAULT_SEPARATOR, start_index: DEFAULT_START_INDEX, end_index: DEFAULT_END_INDEX) ⇒ Join

Returns a new instance of Join.



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# File 'lib/realize/collection/join.rb', line 25

def initialize(separator: DEFAULT_SEPARATOR, start_index: DEFAULT_START_INDEX,
               end_index: DEFAULT_END_INDEX)
  @separator    = separator || DEFAULT_SEPARATOR
  @start_index  = start_index || DEFAULT_START_INDEX
  @end_index    = end_index || DEFAULT_END_INDEX

  freeze
end

Instance Attribute Details

#end_index ⇒ Object (readonly)

Returns the value of attribute end_index.



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# File 'lib/realize/collection/join.rb', line 23

def end_index
  @end_index
end

#separator ⇒ Object (readonly)

Returns the value of attribute separator.



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# File 'lib/realize/collection/join.rb', line 23

def separator
  @separator
end

#start_index ⇒ Object (readonly)

Returns the value of attribute start_index.



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# File 'lib/realize/collection/join.rb', line 23

def start_index
  @start_index
end

Instance Method Details

#transform(_resolver, value, _time, _record) ⇒ Object 



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# File 'lib/realize/collection/join.rb', line 34

def transform(_resolver, value, _time, _record)
  items = array(value)

  (items[start_index..end_index] || []).join(separator)
end