Find and :conditions question

Rails
1

Hello

lets say i have model with :name string field, how to write a “find
:all, :condition => ???” to find records that :name fields includes
certain string…
IRB funcionality example, hope that makes it more clear

irb > str = “112369”
=> “112369”
irb > str.include? “112”
=> true
irb > str.include? “11”
=> true
irb > str.include? “99”
=> false

2

On Thu, Mar 1, 2012 at 12:23 PM, Marcin S [email protected] wrote:

=> true
irb > str.include? “11”
=> true
irb > str.include? “99”
=> false

Presuming you wanted to filter on the condition in the database,
read

Active Record Query Interface — Ruby on Rails Guides

section 2.1 , 2.2 …

Short answer

match_string = “112”
MyModel.where(“name LIKE ‘%?%’”, match_string)

But this is quite flawed for performance on the database …
Read-up on “full text search” to understand those issues.

If you wanted to filter in Ruby, which would only make
sense for “small” amounts of records (< 100 ?), you
could do:

match_string = “112”
matcher = Regexp.new(match_string)
MyModel.all.select{|o| o.name =~ matcher}

Read-up on Regular expressions and Enumerable
functionality for this.

HTH,

Peter