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Class: Arel::Nodes::Case

Do not use. This class is for internal use only.
Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, NodeExpression, Node
Instance Chain:
self, NodeExpression, ::Arel::Math, ::Arel::OrderPredications, ::Arel::AliasPredication, ::Arel::Predications, ::Arel::Expressions, Node, ::Arel::FactoryMethods
Inherits: Arel::Nodes::NodeExpression
Defined in: activerecord/lib/arel/nodes/case.rb

Class Method Summary

Instance Attribute Summary

Node - Inherited

#equality?

Instance Method Summary

::Arel::Math - Included

#&, #*, #+, #-, #/, #<<, #>>, #^, #|, #~@

::Arel::OrderPredications - Included

#asc, #desc

::Arel::AliasPredication - Included

#as

::Arel::Predications - Included

#between, #concat, #contains, #does_not_match, #does_not_match_all, #does_not_match_any, #does_not_match_regexp, #eq, #eq_all, #eq_any, #gt, #gt_all, #gt_any, #gteq, #gteq_all, #gteq_any, #in, #in_all, #in_any, #is_distinct_from, #is_not_distinct_from, #lt, #lt_all, #lt_any, #lteq, #lteq_all, #lteq_any, #matches, #matches_all, #matches_any, #matches_regexp, #not_between, #not_eq, #not_eq_all, #not_eq_any, #not_in, #not_in_all, #not_in_any, #overlaps, #quoted_array, #when, #grouping_all, #grouping_any, #infinity?, #open_ended?, #quoted_node, #unboundable?

::Arel::Expressions - Included

#average, #count, #extract, #maximum, #minimum, #sum

Node - Inherited

#and

Factory method to create an And node.
#fetch_attribute, #invert,
#not

Factory method to create a Nodes::Not node that has the recipient of the caller as a child.
#or

Factory method to create a Grouping node that has an Or node as a child.
#to_sql

FIXME: this method should go away.

::Arel::FactoryMethods - Included

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

Create a LOWER() function.

Constructor Details

.new(expression = nil, default = nil) ⇒ Case

[ GitHub ] 

  


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



def initialize(expression = nil, default = nil)
  @case = expression
  @conditions = []
  @default = default
end


  







Instance Attribute Details



  

    #case   (rw)
  

  [ GitHub ]


  

  


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



attr_accessor :case, :conditions, :default


  








  

    #conditions   (rw)
  

  [ GitHub ]


  

  


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



attr_accessor :case, :conditions, :default


  








  

    #default   (rw)
  

  [ GitHub ]


  

  


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



attr_accessor :case, :conditions, :default


  







Instance Method Details



  

    #==(other)  
  



  

    

Alias for #eql?.


  



  [ GitHub ]


  

  


# File 'activerecord/lib/arel/nodes/case.rb', line 46



alias :== :eql?


  








  

    #else(expression)  
  

  [ GitHub ]


  

  


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



def else(expression)
  @default = Else.new Nodes.build_quoted(expression)
  self
end


  








  

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



  

    
  





  


  [ GitHub ]


  

  


# File 'activerecord/lib/arel/nodes/case.rb', line 40



def eql?(other)
  self.class == other.class &&
    self.case == other.case &&
    self.conditions == other.conditions &&
    self.default == other.default
end


  








  

    #hash  
  

  [ GitHub ]


  

  


# File 'activerecord/lib/arel/nodes/case.rb', line 36



def hash
  [@case, @conditions, @default].hash
end


  








  

    #initialize_copy(other)  
  

  [ GitHub ]


  

  


# File 'activerecord/lib/arel/nodes/case.rb', line 29



def initialize_copy(other)
  super
  @case = @case.clone if @case
  @conditions = @conditions.map { |x| x.clone }
  @default = @default.clone if @default
end


  








  

    #then(expression)  
  

  [ GitHub ]


  

  


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



def then(expression)
  @conditions.last.right = Nodes.build_quoted(expression)
  self
end


  








  

    #when(condition, expression = nil)  
  

  [ GitHub ]


  

  


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



def when(condition, expression = nil)
  @conditions << When.new(Nodes.build_quoted(condition), expression)
  self
end