Class: Prequel::Sql::DerivedQueryColumn

Inherits:
Object
  • Object
show all
Defined in:
lib/prequel/sql/derived_query_column.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(subquery, name, expression) ⇒ DerivedQueryColumn

Returns a new instance of DerivedQueryColumn.



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# File 'lib/prequel/sql/derived_query_column.rb', line 6

def initialize(subquery, name, expression)
  @subquery, @name, @expression = subquery, name, expression
end

Instance Attribute Details

#expression ⇒ Object (readonly)

Returns the value of attribute expression.



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# File 'lib/prequel/sql/derived_query_column.rb', line 4

def expression
  @expression
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/prequel/sql/derived_query_column.rb', line 4

def name
  @name
end

#subquery ⇒ Object (readonly)

Returns the value of attribute subquery.



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# File 'lib/prequel/sql/derived_query_column.rb', line 4

def subquery
  @subquery
end

Instance Method Details

#qualified_name ⇒ Object 



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# File 'lib/prequel/sql/derived_query_column.rb', line 18

def qualified_name
  "#{subquery.name}__#{name}"
end

#to_select_clause_sql ⇒ Object 



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# File 'lib/prequel/sql/derived_query_column.rb', line 14

def to_select_clause_sql
  "#{expression.to_sql} as #{name}"
end

#to_sql ⇒ Object 



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# File 'lib/prequel/sql/derived_query_column.rb', line 10

def to_sql
  "#{subquery.name}.#{name}"
end