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class ChangeAttachmentsContainerDefaults < ActiveRecord::Migration
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def self.up
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# Need to drop the index otherwise the following error occurs in Rails 3.1.3:
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#
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# Index name 'temp_index_altered_attachments_on_container_id_and_container_type' on
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# table 'altered_attachments' is too long; the limit is 64 characters
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remove_index :attachments, [:container_id, :container_type]
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change_column :attachments, :container_id, :integer, :default => nil, :null => true
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change_column :attachments, :container_type, :string, :limit => 30, :default => nil, :null => true
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Attachment.where("container_id = 0").update_all("container_id = NULL")
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Attachment.where("container_type = ''").update_all("container_type = NULL")
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add_index :attachments, [:container_id, :container_type]
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end
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def self.down
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remove_index :attachments, [:container_id, :container_type]
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change_column :attachments, :container_id, :integer, :default => 0, :null => false
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change_column :attachments, :container_type, :string, :limit => 30, :default => "", :null => false
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add_index :attachments, [:container_id, :container_type]
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end
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end
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