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# frozen_string_literal: true
module LooseForeignKeys
class ProcessDeletedRecordsService
BATCH_SIZE = 1000
def initialize(connection:)
@connection = connection
end
def execute
modification_tracker = ModificationTracker.new
tracked_tables.cycle do |table|
records = load_batch_for_table(table)
if records.empty?
tracked_tables.delete(table)
next
end
break if modification_tracker.over_limit?
model = find_parent_model!(table)
LooseForeignKeys::BatchCleanerService
.new(parent_klass: model,
deleted_parent_records: records,
modification_tracker: modification_tracker,
models_by_table_name: models_by_table_name)
.execute
break if modification_tracker.over_limit?
end
modification_tracker.stats
end
private
attr_reader :connection
def load_batch_for_table(table)
fully_qualified_table_name = "#{current_schema}.#{table}"
LooseForeignKeys::DeletedRecord.load_batch_for_table(fully_qualified_table_name, BATCH_SIZE)
end
def find_parent_model!(table)
models_by_table_name.fetch(table)
end
def current_schema
@current_schema = connection.current_schema
end
def tracked_tables
@tracked_tables ||= models_by_table_name
.select { |table_name, model| model.respond_to?(:loose_foreign_key_definitions) }
.keys
end
def models_by_table_name
@models_by_table_name ||= begin
all_models
.select(&:base_class?)
.index_by(&:table_name)
end
end
def all_models
ApplicationRecord.descendants
end
end
end
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