Class: StagingTable::Session

Inherits:
Object
  • Object
show all
Defined in:
lib/staging_table/session.rb

Constant Summary collapse

CALLBACK_OPTIONS =

Supported callback options:

- before_insert: ->(session) { ... }
- after_insert: ->(session, records) { ... }
- before_transfer: ->(session) { ... }
- after_transfer: ->(session, result) { ... }

%i[before_insert after_insert before_transfer after_transfer].freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(source_model, **options) ⇒ Session

Returns a new instance of Session.



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# File 'lib/staging_table/session.rb', line 16

def initialize(source_model, **options)
  @source_model = source_model
  config = StagingTable.configuration
  @callbacks = options.slice(*CALLBACK_OPTIONS)
  @options = {
    batch_size: config.default_batch_size,
    transfer_strategy: config.default_transfer_strategy
  }.merge(options.except(*CALLBACK_OPTIONS))
  @table_created = false
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method, *args, &block) ⇒ Object

Delegate unknown methods to the staging model (e.g. for querying)



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# File 'lib/staging_table/session.rb', line 141

def method_missing(method, *args, &block)
  if staging_model.respond_to?(method)
    staging_model.send(method, *args, &block)
  else
    super
  end
end

Instance Attribute Details

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/staging_table/session.rb', line 7

def options
  @options
end

#source_model ⇒ Object (readonly)

Returns the value of attribute source_model.



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# File 'lib/staging_table/session.rb', line 7

def source_model
  @source_model
end

#staging_model ⇒ Object (readonly)

Returns the value of attribute staging_model.



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# File 'lib/staging_table/session.rb', line 7

def staging_model
  @staging_model
end

Instance Method Details

#create_table ⇒ Object 



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# File 'lib/staging_table/session.rb', line 27

def create_table
  return if @table_created

  payload = {
    source_model: source_model,
    source_table: source_model.table_name,
    staging_table: staging_table_name
  }

  Instrumentation.instrument(:create_table, payload) do
    adapter.create_table(staging_table_name, source_model.table_name, options)
    @staging_model = ModelFactory.build(source_model, staging_table_name, excluded_columns: options[:excluded_columns] || [])
    @table_created = true
  end
end

#drop_table ⇒ Object 



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# File 'lib/staging_table/session.rb', line 43

def drop_table
  return unless @table_created

  payload = {
    source_model: source_model,
    source_table: source_model.table_name,
    staging_table: staging_table_name
  }

  Instrumentation.instrument(:drop_table, payload) do
    adapter.drop_table(staging_table_name)
    @table_created = false
    @staging_model = nil
  end
end

#insert(records) ⇒ Object 



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# File 'lib/staging_table/session.rb', line 59

def insert(records)
  ensure_table_created!

  run_callback(:before_insert, self)

  normalized_records = normalize_records(records)

  payload = {
    source_model: source_model,
    source_table: source_model.table_name,
    staging_table: staging_table_name,
    record_count: normalized_records.size,
    batch_size: options[:batch_size] || 1000
  }

  Instrumentation.instrument(:insert, payload) do
    BulkInserter.new(staging_model, batch_size: options[:batch_size] || 1000).insert(normalized_records)
  end

  run_callback(:after_insert, self, normalized_records)
end

#insert_from_query(relation) ⇒ Object 



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# File 'lib/staging_table/session.rb', line 81

def insert_from_query(relation)
  ensure_table_created!

  run_callback(:before_insert, self)

  # TODO: Implement direct INSERT INTO SELECT for query-based insertion
  # For now, we'll iterate, but this should be optimized
  all_records = []

  payload = {
    source_model: source_model,
    source_table: source_model.table_name,
    staging_table: staging_table_name,
    batch_size: options[:batch_size] || 1000
  }

  Instrumentation.instrument(:insert, payload) do |instrumentation_payload|
    relation.find_in_batches(batch_size: options[:batch_size] || 1000) do |batch|
      records = batch.map(&:attributes)
      all_records.concat(records)
      BulkInserter.new(staging_model, batch_size: options[:batch_size] || 1000).insert(records)
    end
    instrumentation_payload[:record_count] = all_records.size
  end

  run_callback(:after_insert, self, all_records)
end

#respond_to_missing?(method, include_private = false) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/staging_table/session.rb', line 149

def respond_to_missing?(method, include_private = false)
  staging_model.respond_to?(method, include_private) || super
end

#transfer ⇒ Object 



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# File 'lib/staging_table/session.rb', line 109

def transfer
  ensure_table_created!

  run_callback(:before_transfer, self)

  strategy_name = options[:transfer_strategy].to_s.camelize
  begin
    strategy_class = TransferStrategies.const_get(strategy_name)
  rescue NameError
    raise ConfigurationError, "Invalid transfer strategy: #{options[:transfer_strategy]}. Available strategies: insert, upsert."
  end

  payload = {
    source_model: source_model,
    source_table: source_model.table_name,
    staging_table: staging_table_name,
    strategy: options[:transfer_strategy],
    staged_count: staging_model.count
  }

  result = Instrumentation.instrument(:transfer, payload) do |instrumentation_payload|
    transfer_result = strategy_class.new(source_model, staging_model, options).transfer
    instrumentation_payload[:result] = transfer_result
    transfer_result
  end

  run_callback(:after_transfer, self, result)

  result
end