Class: Prato::Internal::QueryState

Inherits:
Object
  • Object
show all
Defined in:
lib/prato/internal/query_state.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#dataset ⇒ Object (readonly)

Returns the value of attribute dataset.



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# File 'lib/prato/internal/query_state.rb', line 6

def dataset
  @dataset
end

Class Method Details

.create(base_scope, materialization_fields) ⇒ Object 



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# File 'lib/prato/internal/query_state.rb', line 8

def self.create(base_scope, materialization_fields)
  dataset = base_scope.dup

  new(dataset, nil, materialization_fields)
end

Instance Method Details

#materialized_dataset(spec) ⇒ Object 



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# File 'lib/prato/internal/query_state.rb', line 22

def materialized_dataset(spec)
  return [@dataset, @ruby_loaded_data] unless unmaterialized?

  columns = spec.columns
  scope = dataset
  selects = Set.new([Arel.sql("#{scope.model.table_name}.*")])
  association_load_values = []

  @materialization_fields.each do |field|
    column = columns[field]

    case column
    when Types::AggregateColumn, Types::ExpressionColumn
      selects << column.select_node
    when Types::AssociationColumn
      association_load_values << association_path_to_association_load(column.association_path)
    when Types::RubyColumn
      association_load_values << column.includes if column.includes

      loader = spec.ruby_loaders&.[](column.loader)
      association_load_values << loader[:includes] if loader && loader[:includes]
    end
  end

  if association_load_values.any?
    scope = apply_association_loading(scope, association_load_values)
  end

  scope = scope.select(selects.to_a)
  records = scope.to_a

  ruby_loaded_data = nil
  if spec.ruby_loaders&.any?
    ruby_loaded_data = LazyLoaderCache.new(records)
    spec.ruby_loaders.each { |key, loader| ruby_loaded_data[key] = loader[:block] }
  end

  @records = records
  @ruby_loaded_data = ruby_loaded_data
  [records, ruby_loaded_data]
end

#unmaterialized? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/prato/internal/query_state.rb', line 18

def unmaterialized?
  !dataset.is_a?(Array)
end

#with_dataset(dataset) ⇒ Object 



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# File 'lib/prato/internal/query_state.rb', line 14

def with_dataset(dataset)
  self.class.new(dataset, @ruby_loaded_data, @materialization_fields)
end