Class: Sequel::SQL::VirtualRow

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

Overview

An instance of this class is yielded to the block supplied to filter. Useful if another library also defines the operator methods that Sequel defines for symbols.

Examples:

ds = DB[:t]
ds.filter{|r| r.name < 2} # SELECT * FROM t WHERE (name < 2)
ds.filter{|r| r.table__column + 1 < 2} # SELECT * FROM t WHERE ((table.column + 1) < 2)
ds.filter{|r| r.is_active(1, 'arg2')} # SELECT * FROM t WHERE is_active(1, 'arg2')

Instance Method Summary collapse

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(m, *args) ⇒ Object

Can return Identifiers, QualifiedIdentifiers, or Functions:

  • Function - returned if any arguments are supplied, using the method name as the function name, and the arguments as the function arguments.

  • QualifiedIdentifier - returned if the method name contains __, with the table being the part before __, and the column being the part after.

  • Identifier - returned otherwise, using the method name.



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# File 'lib/sequel_core/sql.rb', line 792

def method_missing(m, *args)
  if args.empty?
    table, column = m.to_s.split('__', 2)
    column ? QualifiedIdentifier.new(table, column) : Identifier.new(m)
  else
    Function.new(m, *args)
  end
end