in the AddEventIdAtCreationToLinks migration, handle the case of links that don't yet have any events
Albert Sun
1 changed files with 14 additions and 8 deletions
+ 14
- 8
db/migrate/20140213053001_add_event_id_at_creation_to_links.rb
@@ -2,14 +2,20 @@ class AddEventIdAtCreationToLinks < ActiveRecord::Migration |
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| 2 | 2 |
def up |
| 3 | 3 |
add_column :links, :event_id_at_creation, :integer, :null => false, :default => 0 |
| 4 | 4 |
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- execute <<-SQL |
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- UPDATE #{ActiveRecord::Base.connection.quote_table_name('links')}
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- SET event_id_at_creation = ( |
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- SELECT #{ActiveRecord::Base.connection.quote_column_name('id')}
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- FROM #{ActiveRecord::Base.connection.quote_table_name('events')}
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- WHERE events.agent_id = links.source_id ORDER BY events.id DESC limit 1 |
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- ) |
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- SQL |
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+ Link.all.each do |link| |
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+ last_event_id = execute( |
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+ <<-SQL |
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+ SELECT #{ActiveRecord::Base.connection.quote_column_name('id')}
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+ FROM #{ActiveRecord::Base.connection.quote_table_name('events')}
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+ WHERE events.agent_id = #{link.source_id} ORDER BY events.id DESC limit 1
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+ SQL |
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+ ).first.to_a.first |
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+ if last_event_id.nil? |
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+ link.event_id_at_creation = Event.last.id |
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+ else |
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+ link.event_id_at_creation = last_event_id |
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+ end |
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+ end |
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| 13 | 19 |
end |
| 14 | 20 |
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| 15 | 21 |
def down |