Class: Arel::Middleware::DatabaseExecutor

Inherits:
Object
  • Object
show all
Defined in:
lib/arel/middleware/database_executor.rb

Direct Known Subclasses

ToSqlExecutor

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(middleware) ⇒ DatabaseExecutor

Returns a new instance of DatabaseExecutor.



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# File 'lib/arel/middleware/database_executor.rb', line 10

def initialize(middleware)
  @middleware = middleware
end

Instance Attribute Details

#context ⇒ Object (readonly)

Returns the value of attribute context.



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# File 'lib/arel/middleware/database_executor.rb', line 7

def context
  @context
end

#final_block ⇒ Object (readonly)

Returns the value of attribute final_block.



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# File 'lib/arel/middleware/database_executor.rb', line 8

def final_block
  @final_block
end

#index ⇒ Object

Returns the value of attribute index.



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# File 'lib/arel/middleware/database_executor.rb', line 6

def index
  @index
end

#middleware ⇒ Object (readonly)

Returns the value of attribute middleware.



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# File 'lib/arel/middleware/database_executor.rb', line 4

def middleware
  @middleware
end

Instance Method Details

#call(next_arel) ⇒ Object 



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# File 'lib/arel/middleware/database_executor.rb', line 28

def call(next_arel)
  check_argument_type next_arel

  current_middleware = middleware[index]

  return execute_sql(next_arel) if current_middleware.nil?

  self.index += 1

  case current_middleware.method(:call).arity
  when 2
    current_middleware.call(next_arel, self)
  else
    current_middleware.call(next_arel, self, context.dup)
  end
end

#run(arel, context, final_block) ⇒ Object 



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# File 'lib/arel/middleware/database_executor.rb', line 14

def run(arel, context, final_block)
  @index = 0
  @context = context
  @final_block = final_block

  result = call(arel)
  check_return_type result
  result
ensure
  @index = 0
  @context = nil
  @final_block = nil
end