Class: MR::ReadModel::SubqueryExpression

Inherits:
Object
  • Object
show all
Defined in:
lib/mr/read_model/query_expression.rb

Constant Summary collapse

TYPES = 
{
  :joins => JoinSubquery
}.freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(type, *args, &block) ⇒ SubqueryExpression

Returns a new instance of SubqueryExpression.

Raises:

  • (ArgumentError) 


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# File 'lib/mr/read_model/query_expression.rb', line 66

def initialize(type, *args, &block)
  raise ArgumentError, "a block must be provided" unless block
  @subquery_type  = type
  @subquery_args  = args
  @subquery_block = block
end

Instance Attribute Details

#subquery_args ⇒ Object (readonly)

Returns the value of attribute subquery_args.



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# File 'lib/mr/read_model/query_expression.rb', line 63

def subquery_args
  @subquery_args
end

#subquery_block ⇒ Object (readonly)

Returns the value of attribute subquery_block.



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# File 'lib/mr/read_model/query_expression.rb', line 63

def subquery_block
  @subquery_block
end

#subquery_type ⇒ Object (readonly) Also known as: type

Returns the value of attribute subquery_type.



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# File 'lib/mr/read_model/query_expression.rb', line 63

def subquery_type
  @subquery_type
end

Instance Method Details

#apply_to(relation, params = nil) ⇒ Object 



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# File 'lib/mr/read_model/query_expression.rb', line 80

def apply_to(relation, params = nil)
  relation.send(self.type, self.subquery.build_sql(params))
end

#subquery ⇒ Object 



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# File 'lib/mr/read_model/query_expression.rb', line 73

def subquery
  @subquery ||= TYPES[self.subquery_type].new(
    *self.subquery_args,
    &self.subquery_block
  )
end