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Article: Evaluation Options in Ruby

by Obie Fernandez on Feb 14, 2007 |

InfoQ is proud to present a comprehensive discussion of Ruby's various eval methods. This exclusive article is full of rich code examples, written by Domain-Specific Languages master Jay Fields, who after coining the term Business Natural Langages last year, has gone ahead to widespread recognition for his pioneering work in enterprise usage of Ruby and Rails.

In the article, Jay teaches you the capabilities and differences between class_eval, instance_eval and plain eval. His explanation provides insight into how the evaluation methods of Ruby provide very good options for creating concise, readable code.

Read Evaluation Options in Ruby

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error by haoxiang zhang Posted

Re: error by haoxiang zhang Posted

error by haoxiang zhang

Select[:column1, :column2].from[:table1, :table2].where do
equal table1.id, table2.table1_id
end

it is should be use {} instend of do ... end

because of do...end will be send to Select method , not where.

Re: error by haoxiang zhang

sorry, it is my fault.