33 lines
1,005 B
Ruby
33 lines
1,005 B
Ruby
class MappingPolymorphism < ActiveRecord::Migration
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def up
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add_column :mappings, :mappable_id, :integer
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add_column :mappings, :mappable_type, :string
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add_index :mappings, [:mappable_id, :mappable_type]
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Mapping.find_each do |mapping|
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if mapping.synapse_id.nil? and mapping.topic_id.nil?
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puts "Mapping id=#{mapping.id} has no valid id, skipping!"
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next
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end
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if not mapping.synapse_id.nil? and not mapping.topic_id.nil?
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puts "Mapping id=#{mapping.id} has both topic and synapse ids, skipping!"
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next
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end
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unless mapping.synapse_id.nil?
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mapping.mappable = Synapse.find(mapping.synapse_id)
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else
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next if mapping.topic_id == 0
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mapping.mappable = Topic.find(mapping.topic_id)
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end
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mapping.save
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end
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end
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def down
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remove_index :mappings, [:mappable_id, :mappable_type]
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remove_column :mappings, :mappable_id, :integer
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remove_column :mappings, :mappable_type, :string
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end
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end
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