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34 lines
1.1 KiB
Ruby
34 lines
1.1 KiB
Ruby
class AddProjectReferenceToActivity < ActiveRecord::Migration[4.2]
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def up
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# Make my module reference nullable
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change_column_null :activities, :my_module_id, true
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# Add reference to project
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add_reference :activities, :project, index: true
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add_foreign_key :activities, :projects
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# Update existing entries so they all have project reference
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Activity.all.each do |activity|
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if activity.present? and
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activity.my_module.present? and
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activity.my_module.project.present? then
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activity.project = activity.my_module.project
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activity.save
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end
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end
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# Make project reference non-nullable
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change_column_null :activities, :project_id, false
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end
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def down
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# Unfortunately, all activities that are bound to project
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# need to be deleted since they're not "compatible" in the previous
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# version of the DB
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Activity.destroy_all(my_module: nil)
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remove_foreign_key :activities, :projects
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remove_reference :activities, :project, index: true
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change_column_null :activities, :my_module_id, false
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end
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end
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