36 lines
1.5 KiB
Ruby
36 lines
1.5 KiB
Ruby
require 'migrate'
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class AddEndTimeToChangesets < ActiveRecord::Migration
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def self.up
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# swap the boolean closed-or-not for a time when the changeset will
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# close or has closed.
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add_column(:changesets, :closed_at, :datetime, :null => false)
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# it appears that execute will only accept string arguments, so
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# this is an ugly, ugly hack to get some sort of mysql/postgres
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# independence. now i have to go wash my brain with bleach.
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execute("update changesets set closed_at=(now()-#{interval_constant('1 hour')}) where open=(1=0)")
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execute("update changesets set closed_at=(now()+#{interval_constant('1 hour')}) where open=(1=1)")
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# remove the open column as it is unnecessary now and denormalises
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# the table.
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remove_column :changesets, :open
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# add a column to keep track of the number of changes in a changeset.
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# could probably work out how many changes there are here, but i'm not
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# sure its actually important.
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add_column(:changesets, :num_changes, :integer,
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:null => false, :default => 0)
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end
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def self.down
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# in the reverse direction, we can look at the closed_at to figure out
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# if changesets are closed or not.
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add_column(:changesets, :open, :boolean, :null => false, :default => true)
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execute("update changesets set open=(closed_at > now())")
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remove_column :changesets, :closed_at
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# remove the column for tracking number of changes
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remove_column :changesets, :num_changes
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end
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end
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