Module | DataMapper::Sweatshop::Unique |
In: |
lib/dm-sweatshop/unique.rb
|
Yields a value to the block. The value is unique for each invocation with the same block. Alternatively, you may provide an explicit key to identify the block.
If a block with no parameter is supplied, unique keeps track of previous invocations, and will continue yielding until a unique value is generated. If a unique value is not generated after @UniqueWorker::MAX_TRIES@, an exception is raised.
ParseTree is required unless an explicit key is provided
(1..3).collect { unique {|x| x }} # => [0, 1, 2] (1..3).collect { unique {|x| x + 1 }} # => [1, 2, 3] (1..3).collect { unique {|x| x }} # => [3, 4, 5] # Continued on from above (1..3).collect { unique(:a) {|x| x }} # => [0, 1, 2] # Explicit key overrides block identity a = [1, 1, 1, 2, 2, 3] (1..3).collect { unique { a.shift }} # => [1, 2, 3] (1..3).collect { unique { 1 }} # raises TooManyTriesException
return <Object> the return value of the block