Class: ActiveSet::Sorting::ActiveRecordStrategy

Inherits:
Object
  • Object
show all
Defined in:
lib/active_set/sorting/active_record_strategy.rb

Instance Method Summary collapse

Constructor Details

#initialize(set, attribute_instructions) ⇒ ActiveRecordStrategy

Returns a new instance of ActiveRecordStrategy.



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# File 'lib/active_set/sorting/active_record_strategy.rb', line 8

def initialize(set, attribute_instructions)
  @set = set
  @attribute_instructions = attribute_instructions
  @set_instructions = attribute_instructions.map do |attribute_instruction|
    ActiveRecordSetInstruction.new(attribute_instruction, set)
  end
end

Instance Method Details

#executable_instructions ⇒ Object 



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# File 'lib/active_set/sorting/active_record_strategy.rb', line 28

def executable_instructions
  return {} unless @set.respond_to? :to_sql

  @set_instructions.select do |set_instruction|
    attribute_model = set_instruction.attribute_model
    next false unless attribute_model
    next false unless attribute_model.respond_to?(:attribute_names)
    next false unless attribute_model.attribute_names.include?(set_instruction.attribute)

    true
  end
end

#execute ⇒ Object 



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# File 'lib/active_set/sorting/active_record_strategy.rb', line 16

def execute
  return false unless @set.respond_to? :to_sql

  executable_instructions.reduce(@set) do |set, set_instruction|
    statement = set.merge(set_instruction.initial_relation)
    statement = statement.merge(order_operation_for(set_instruction))

    set_instruction.processed = true
    statement
  end
end