2: Dynamic find_by Methods 

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Other translations: It Fr Es Kr Pl Pt

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])


@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')


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

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