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delayed_job gem and table
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|+class CreateDelayedJobs < ActiveRecord::Migration|
|+ def self.up|
|+ create_table :delayed_jobs, :force => true do |table||
|+ table.integer :priority, :default => 0 # Allows some jobs to jump to the front of the queue|
|+ table.integer :attempts, :default => 0 # Provides for retries, but still fail eventually.|
|+ table.text :handler # YAML-encoded string of the object that will do work|
|+ table.text :last_error # reason for last failure (See Note below)|
|+ table.datetime :run_at # When to run. Could be Time.zone.now for immediately, or sometime in the future.|
|+ table.datetime :locked_at # Set when a client is working on this object|
|+ table.datetime :failed_at # Set when all retries have failed (actually, by default, the record is deleted instead)|
|+ table.string :locked_by # Who is working on this object (if locked)|
|+ table.string :queue # The name of the queue this job is in|
|+ add_index :delayed_jobs, [:priority, :run_at], :name => 'delayed_jobs_priority'|
|+ def self.down|
|+ drop_table :delayed_jobs|