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2: Dynamic find_by Methods

(view original Railscast)

Other translations:

This is a really useful way to do a Find in Rails. Below is a Task model that searches for tasks that haven’t been completed (i.e. the complete column is false).

class TaskController < ApplicationController
def incomplete
@tasks = Task.find(:all, :conditions => ['complete = ?', false])
end
def last_incomplete
@task = Task.find(:first, :conditions => ['complete =?', false], :order => 'created_at DESC')
end
end

There is a better way to achieve this with find_by_all. Just replace

@tasks = Task.find(:all, :conditions => ['complete = ?', false])

with

@tasks = Task.find_all_by_complete(false)

If you just want to find one Task then use find_by, so to find the latest incomplete task the line

@task = Task.find(:first, :conditions => ['complete =?', false], :order => 'created_at DESC')

becomes

@task = Task.find_by_complete(false, :order => 'created_at DESC')

The find_by method takes the order parameter just like the find method does.

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2: Dynamic find_by Methods