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module RuboCop
# Module containing helper methods for writing migration cops.
module MigrationHelpers
# Tables with permanently small number of records
SMALL_TABLES = %i[
application_settings
plan_limits
].freeze
# Tables with large number of columns (> 50 on GitLab.com as of 03/2020)
WIDE_TABLES = %i[
users
projects
ci_builds
].freeze
# List of helpers that add new columns, either directly (ADD_COLUMN_METHODS)
# or through a create/alter table (TABLE_METHODS)
ADD_COLUMN_METHODS = %i(add_column add_column_with_default change_column_type_concurrently).freeze
TABLE_METHODS = %i(create_table create_table_if_not_exists change_table).freeze
def high_traffic_tables
@high_traffic_tables ||= rubocop_migrations_config.dig('Migration/UpdateLargeTable', 'HighTrafficTables')
end
# Returns true if the given node originated from the db/migrate directory.
def in_migration?(node)
in_deployment_migration?(node) || in_post_deployment_migration?(node)
end
def in_deployment_migration?(node)
dirname(node).end_with?('db/migrate', 'db/geo/migrate')
end
def in_post_deployment_migration?(node)
dirname(node).end_with?('db/post_migrate', 'db/geo/post_migrate')
end
def version(node)
File.basename(node.location.expression.source_buffer.name).split('_').first.to_i
end
# Returns true if a column definition is for an array
# rubocop:disable Lint/BooleanSymbol
def array_column?(node)
node.each_descendant(:pair).any? do |pair_node|
pair_node.child_nodes[0].value == :array && # Searching for a (pair (sym :array) (true)) node
pair_node.child_nodes[1].type == :true # RuboCop::AST::Node uses symbols for types, even when that is a :true
end
end
# rubocop:enable Lint/BooleanSymbol
private
def dirname(node)
File.dirname(node.location.expression.source_buffer.name)
end
def rubocop_migrations_config
@rubocop_migrations_config ||= YAML.load_file(File.join(rubocop_path, 'rubocop-migrations.yml'))
end
def rubocop_path
File.expand_path(__dir__)
end
end
end
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