Class: Gitlab::BackgroundMigration::BatchingStrategies::BackfillProjectNamespacePerGroupBatchingStrategy

Inherits:
PrimaryKeyBatchingStrategy show all
Defined in:
lib/gitlab/background_migration/batching_strategies/backfill_project_namespace_per_group_batching_strategy.rb

Overview

Batching class to use for back-filling project namespaces for a single group. Batches over the projects table and id column combination, scoped to a given group returning the MIN() and MAX() values for the next batch as an array.

If no more batches exist in the table, returns nil.

Constant Summary

Constants included from Database::DynamicModelHelpers

Database::DynamicModelHelpers::BATCH_SIZE

Instance Method Summary collapse

Methods inherited from PrimaryKeyBatchingStrategy

#apply_additional_filters

Methods included from Database::DynamicModelHelpers

#define_batchable_model, #each_batch, #each_batch_range

Methods inherited from BaseStrategy

#initialize

Constructor Details

This class inherits a constructor from Gitlab::BackgroundMigration::BatchingStrategies::BaseStrategy

Instance Method Details

#next_batch(table_name, column_name, batch_min_value:, batch_size:, job_arguments:) ⇒ Object

Finds and returns the next batch in the table.

table_name - The table to batch over column_name - The column to batch over batch_min_value - The minimum value which the next batch will start at batch_size - The size of the next batch job_arguments - The migration job arguments


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# File 'lib/gitlab/background_migration/batching_strategies/backfill_project_namespace_per_group_batching_strategy.rb', line 19

def next_batch(table_name, column_name, batch_min_value:, batch_size:, job_arguments:)
  next_batch_bounds = nil
  model_class = ::Gitlab::BackgroundMigration::ProjectNamespaces::Models::Project
  quoted_column_name = model_class.connection.quote_column_name(column_name)
  projects_table = model_class.arel_table
  hierarchy_cte_sql = Arel::Nodes::SqlLiteral.new(::Gitlab::BackgroundMigration::ProjectNamespaces::BackfillProjectNamespaces.hierarchy_cte(job_arguments.first))
  relation = model_class.where(projects_table[:namespace_id].in(hierarchy_cte_sql)).where("#{quoted_column_name} >= ?", batch_min_value)

  relation.each_batch(of: batch_size, column: column_name) do |batch| # rubocop:disable Lint/UnreachableLoop
    next_batch_bounds = batch.pluck(Arel.sql("MIN(#{quoted_column_name}), MAX(#{quoted_column_name})")).first

    break
  end

  next_batch_bounds
end