27 lines
1.1 KiB
Ruby
27 lines
1.1 KiB
Ruby
class AddContextModuleProgressionsUniqueIndex < ActiveRecord::Migration
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tag :postdeploy
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disable_ddl_transaction!
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def self.up
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ContextModuleProgression.
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select([:user_id, :context_module_id]).
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group(:user_id, :context_module_id).
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includes(:context_module, :user).
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where("user_id IS NOT NULL AND context_module_id IS NOT NULL").
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having("COUNT(*) > 1").find_each do |cmp|
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scope = ContextModuleProgression.
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where(user_id: cmp.user_id, context_module_id: cmp.context_module_id)
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keeper = scope.order("updated_at DESC").first
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scope.where("id<>?", keeper).delete_all
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end
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add_index :context_module_progressions, [:user_id, :context_module_id], unique: true, name: 'index_cmp_on_user_id_and_module_id', algorithm: :concurrently
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remove_index :context_module_progressions, name: 'u_id_module_id'
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end
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def self.down
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remove_index :context_module_progressions, name: 'index_cmp_on_user_id_and_module_id'
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add_index :context_module_progressions, [:user_id, :context_module_id], name: 'u_id_module_id', algorithm: :concurrently
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end
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end
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