Class: Arel::Nodes::Window

Inherits:

Node

• Object
• Node
• Arel::Nodes::Window

show all

Includes:

Expression

Defined in:

lib/arel/nodes/window.rb

Instance Attribute Summary (collapse)

• - (Object) framing

  Returns the value of attribute framing.

• - (Object) orders

  Returns the value of attribute orders.

Instance Method Summary (collapse)

• - (Object) frame(expr)
• - (Window) initialize constructor

  A new instance of Window.

• - (Object) initialize_copy(other)
• - (Object) order(*expr)
• - (Object) range(expr = nil)
• - (Object) rows(expr = nil)

Methods included from OrderPredications

#asc, #desc

Methods inherited from Node

#and, #each, #not, #or, #to_sql

Methods included from FactoryMethods

#create_and, #create_false, #create_join, #create_on, #create_string_join, #create_table_alias, #create_true, #grouping, #lower

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# File 'lib/arel/nodes/window.rb', line 7

def initialize
  @orders = []
end

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# File 'lib/arel/nodes/window.rb', line 5

def framing
  @framing
end

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# File 'lib/arel/nodes/window.rb', line 5

def orders
  @orders
end

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# File 'lib/arel/nodes/window.rb', line 19

def frame(expr)
  raise ArgumentError, "Window frame cannot be set more than once" if @frame
  @framing = expr
end

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# File 'lib/arel/nodes/window.rb', line 32

def initialize_copy other
  super
  @orders = @orders.map { |x| x.clone }
end

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# File 'lib/arel/nodes/window.rb', line 11

def order *expr
  # FIXME: We SHOULD NOT be converting these to SqlLiteral automatically
  @orders.concat expr.map { |x|
    String === x || Symbol === x ? Nodes::SqlLiteral.new(x.to_s) : x
  }
  self
end

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# File 'lib/arel/nodes/window.rb', line 28

def range(expr = nil)
  frame(Range.new(expr))
end

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# File 'lib/arel/nodes/window.rb', line 24

def rows(expr = nil)
  frame(Rows.new(expr))
end