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# rubocop:disable Migration/UpdateLargeTable
class AddHeadPipelineForEachMergeRequest < ActiveRecord::Migration[4.2]
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
disable_ddl_transaction!
def up
pipelines = Arel::Table.new(:ci_pipelines)
merge_requests = Arel::Table.new(:merge_requests)
disable_statement_timeout do
head_id = pipelines
.project(Arel::Nodes::NamedFunction.new('max', [pipelines[:id]]))
.from(pipelines)
.where(pipelines[:ref].eq(merge_requests[:source_branch]))
.where(pipelines[:project_id].eq(merge_requests[:source_project_id]))
sub_query = Arel::Nodes::SqlLiteral.new(Arel::Nodes::Grouping.new(head_id).to_sql)
update_column_in_batches(:merge_requests, :head_pipeline_id, sub_query)
end
end
def down
end
end
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