Class: ArelExtensions::Nodes::Coalesce

Inherits:
Function show all
Defined in:
lib/arel_extensions/nodes/coalesce.rb

Constant Summary collapse

RETURN_TYPE = 
:string

Constants inherited from Function

Function::MBSTRING

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Function

#!=, #==, #as, #convert_to_date_node, #convert_to_datetime_node, #convert_to_node, #convert_to_number, #convert_to_string_node, #expr, #left, #right, #type_of_attribute

Methods included from Predications

#cast, #convert_to_node, #imatches, #in, #matches, #not_in, #when

Methods inherited from Arel::Nodes::Function

#as

Methods included from ArelExtensions::NullFunctions

#coalesce, #coalesce_blank, #if_present, #is_not_null, #is_null

Methods included from BooleanFunctions

#and, #or, #then, #⋀, #⋁

Methods included from StringFunctions

#&, #[], #ai_collate, #ai_imatches, #ai_matches, #blank, #byte_length, #char_length, #ci_collate, #collate, #concat, #downcase, #edit_distance, #group_concat, #idoes_not_match, #idoes_not_match_all, #idoes_not_match_any, #imatches, #imatches_all, #imatches_any, #length, #levenshtein_distance, #locate, #ltrim, #md5, #not_blank, #regexp_replace, #repeat, #replace, #rtrim, #smatches, #soundex, #substring, #trim, #upcase

Methods included from MathFunctions

#*, #/, #abs, #ceil, #floor, #format_number, #log10, #pow, #power, #round, #std, #sum, #variance

Methods included from DateDuration

#day, #format, #format_date, #hour, #minute, #month, #second, #wday, #week, #year

Methods included from Comparators

#!~, #<, #<=, #=~, #>, #>=

Methods included from Math

#+, #-

Methods included from Aliases

#xas

Constructor Details

#initialize(expr) ⇒ Coalesce

Returns a new instance of Coalesce.



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# File 'lib/arel_extensions/nodes/coalesce.rb', line 12

def initialize expr
  tab = expr.map { |arg|
    convert_to_node(arg)
  }
  case expr.first
  when String
    @left_node_type = :string
  when Integer, Float
    @left_node_type = :number
  when ArelExtensions::Nodes::Coalesce, ArelExtensions::Nodes::Function
    @left_node_type = expr.first.respond_to?(:left_node_type) ? expr.first.left_node_type : nil
  when Arel::Nodes::Node, Arel::Attributes::Attribute
    @left_node_type = type_of_attribute(expr.first)
  when Date
    @left_node_type = :ruby_date
  when DateTime, Time
    @left_node_type = :ruby_time
  end
  super(tab)
end

Instance Attribute Details

#left_node_type ⇒ Object

Returns the value of attribute left_node_type.



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# File 'lib/arel_extensions/nodes/coalesce.rb', line 6

def left_node_type
  @left_node_type
end

Instance Method Details

#return_type ⇒ Object 



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# File 'lib/arel_extensions/nodes/coalesce.rb', line 8

def return_type
  @left_node_type || self.class.const_get(:RETURN_TYPE)
end