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module Labels
class PromoteService < BaseService
BATCH_SIZE = 1000
def execute(label)
return unless project.group &&
label.is_a?(ProjectLabel)
Label.transaction do
new_label = clone_label_to_group_label(label)
label_ids_for_merge(new_label).find_in_batches(batch_size: BATCH_SIZE) do |batched_ids|
update_issuables(new_label, batched_ids)
update_issue_board_lists(new_label, batched_ids)
update_priorities(new_label, batched_ids)
# Order is important, project labels need to be last
update_project_labels(batched_ids)
end
# We skipped validations during creation. Let's run them now, after deleting conflicting labels
raise ActiveRecord::RecordInvalid.new(new_label) unless new_label.valid?
new_label
end
end
private
def label_ids_for_merge(new_label)
LabelsFinder
.new(current_user, title: new_label.title, group_id: project.group.id)
.execute(skip_authorization: true)
.where.not(id: new_label)
.select(:id) # Can't use pluck() to avoid object-creation because of the batching
end
def update_issuables(new_label, label_ids)
LabelLink
.where(label: label_ids)
.update_all(label_id: new_label)
end
def update_issue_board_lists(new_label, label_ids)
List
.where(label: label_ids)
.update_all(label_id: new_label)
end
def update_priorities(new_label, label_ids)
LabelPriority
.where(label: label_ids)
.update_all(label_id: new_label)
end
def update_project_labels(label_ids)
Label.where(id: label_ids).delete_all
end
def clone_label_to_group_label(label)
params = label.attributes.slice('title', 'description', 'color')
# Since the title of the new label has to be the same as the previous labels
# and we're merging old labels in batches we'll skip validation to omit 2-step
# merge process and do it in one batch
# We'll be forcing validation at the end of the transaction to ensure everything
# was merged correctly
new_label = GroupLabel.new(params.merge(group: project.group))
new_label.save(validate: false)
new_label
end
end
end
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