Class: Arel::UpdateManager

Inherits:
TreeManager show all
Defined in:
lib/arel/update_manager.rb

Instance Attribute Summary

Attributes inherited from TreeManager

#ast, #engine, #visitor

Instance Method Summary collapse

Methods inherited from TreeManager

#initialize_copy, #to_dot, #to_sql

Constructor Details

#initialize(engine) ⇒ UpdateManager

Returns a new instance of UpdateManager.



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# File 'lib/arel/update_manager.rb', line 3

def initialize engine
  super
  @ast = Nodes::UpdateStatement.new
  @ctx = @ast
end

Instance Method Details

#order(*expr) ⇒ Object 



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# File 'lib/arel/update_manager.rb', line 14

def order *expr
  @ast.orders = expr
  self
end

#set(values) ⇒ Object 



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# File 'lib/arel/update_manager.rb', line 35

def set values
  if String === values
    @ast.values = [values]
  else
    @ast.values = values.map { |column,value|
      Nodes::Assignment.new(
        Nodes::UnqualifiedColumn.new(column),
        value
      )
    }
  end
  self
end

#table(table) ⇒ Object

UPDATE table



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# File 'lib/arel/update_manager.rb', line 21

def table table
  @ast.relation = table
  self
end

#take(limit) ⇒ Object 



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# File 'lib/arel/update_manager.rb', line 9

def take limit
  @ast.limit = Nodes::Limit.new(limit) if limit
  self
end

#where(expr) ⇒ Object 



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# File 'lib/arel/update_manager.rb', line 30

def where expr
  @ast.wheres << expr
  self
end

#wheres=(exprs) ⇒ Object 



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# File 'lib/arel/update_manager.rb', line 26

def wheres= exprs
  @ast.wheres = exprs
end