49 lines
2.1 KiB
Ruby
49 lines
2.1 KiB
Ruby
class AddUniqueIndexOnEnrollments < ActiveRecord::Migration
|
|
tag :postdeploy
|
|
disable_ddl_transaction!
|
|
|
|
def self.up
|
|
DataFixup::RemoveDuplicateEnrollments.run
|
|
if connection.adapter_name == 'PostgreSQL'
|
|
add_index :enrollments,
|
|
[:user_id, :type, :role_name, :course_section_id, :associated_user_id],
|
|
where: "associated_user_id IS NOT NULL AND role_name IS NOT NULL",
|
|
name: 'index_enrollments_on_user_type_role_section_associated_user',
|
|
unique: true,
|
|
algorithm: :concurrently
|
|
add_index :enrollments,
|
|
[:user_id, :type, :role_name, :course_section_id],
|
|
where: "role_name IS NOT NULL AND associated_user_id IS NULL ",
|
|
name: 'index_enrollments_on_user_type_role_section',
|
|
unique: true,
|
|
algorithm: :concurrently
|
|
add_index :enrollments,
|
|
[:user_id, :type, :course_section_id, :associated_user_id],
|
|
where: "associated_user_id IS NOT NULL AND role_name IS NULL",
|
|
name: 'index_enrollments_on_user_type_section_associated_user',
|
|
unique: true,
|
|
algorithm: :concurrently
|
|
add_index :enrollments,
|
|
[:user_id, :type, :course_section_id],
|
|
where: {associated_user_id: nil, role_name: nil},
|
|
unique: true,
|
|
algorithm: :concurrently
|
|
else
|
|
add_index :enrollments,
|
|
[:user_id, :type, :role_name, :course_section_id, :associated_user_id],
|
|
name: 'index_enrollments_on_user_type_role_section_associated_user',
|
|
unique: true,
|
|
algorithm: :concurrently
|
|
end
|
|
end
|
|
|
|
def self.down
|
|
remove_index :enrollments, name: 'index_enrollments_on_user_type_role_section_associated_user'
|
|
if connection.adapter_name == 'PostgreSQL'
|
|
remove_index :enrollments, name: 'index_enrollments_on_user_type_role_section'
|
|
remove_index :enrollments, name: 'index_enrollments_on_user_type_section_associated_user'
|
|
remove_index :enrollments, [:user_id, :type, :course_section_id]
|
|
end
|
|
end
|
|
end
|