Class: Arel::Nodes::Window

Inherits:
Node show all
Defined in:
activerecord/lib/arel/nodes/window.rb

Direct Known Subclasses

NamedWindow

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Node

#and, #fetch_attribute, #invert, #not, #or, #to_sql

Methods included from FactoryMethods

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

Constructor Details

#initializeWindow

Returns a new instance of Window.


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# File 'activerecord/lib/arel/nodes/window.rb', line 8

def initialize
  @orders = []
  @partitions = []
  @framing = nil
end

Instance Attribute Details

#framingObject

Returns the value of attribute framing


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# File 'activerecord/lib/arel/nodes/window.rb', line 6

def framing
  @framing
end

#ordersObject

Returns the value of attribute orders


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# File 'activerecord/lib/arel/nodes/window.rb', line 6

def orders
  @orders
end

#partitionsObject

Returns the value of attribute partitions


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# File 'activerecord/lib/arel/nodes/window.rb', line 6

def partitions
  @partitions
end

Instance Method Details

#eql?(other) ⇒ Boolean Also known as: ==

Returns:

  • (Boolean)

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# File 'activerecord/lib/arel/nodes/window.rb', line 59

def eql?(other)
  self.class == other.class &&
    self.orders == other.orders &&
    self.framing == other.framing &&
    self.partitions == other.partitions
end

#frame(expr) ⇒ Object


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# File 'activerecord/lib/arel/nodes/window.rb', line 30

def frame(expr)
  @framing = expr
end

#hashObject


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# File 'activerecord/lib/arel/nodes/window.rb', line 55

def hash
  [@orders, @framing].hash
end

#initialize_copy(other) ⇒ Object


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# File 'activerecord/lib/arel/nodes/window.rb', line 50

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

#order(*expr) ⇒ Object


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# File 'activerecord/lib/arel/nodes/window.rb', line 14

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

#partition(*expr) ⇒ Object


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# File 'activerecord/lib/arel/nodes/window.rb', line 22

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

#range(expr = nil) ⇒ Object


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# File 'activerecord/lib/arel/nodes/window.rb', line 42

def range(expr = nil)
  if @framing
    Range.new(expr)
  else
    frame(Range.new(expr))
  end
end

#rows(expr = nil) ⇒ Object


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# File 'activerecord/lib/arel/nodes/window.rb', line 34

def rows(expr = nil)
  if @framing
    Rows.new(expr)
  else
    frame(Rows.new(expr))
  end
end