Class: ArelExtensions::Nodes::Function

Inherits:
Arel::Nodes::Function
  • Object
show all
Includes:
Arel::Expressions, Arel::Math, Arel::OrderPredications, Predications
Defined in:
lib/arel_extensions/nodes/function.rb

Constant Summary collapse

RETURN_TYPE =

by default…

:string

Instance Method Summary collapse

Methods included from Predications

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

Instance Method Details

#as(other) ⇒ Object 



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# File 'lib/arel_extensions/nodes/function.rb', line 20

def as other
  ArelExtensions::Nodes::As.new(self, Arel.sql(other))
end

#convert_to_date_node(object) ⇒ Object 



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# File 'lib/arel_extensions/nodes/function.rb', line 104

def convert_to_date_node(object)
  case object
  when Arel::Attributes::Attribute, Arel::Nodes::Node
    object
  when DateTime, Time
    Arel::Nodes.build_quoted(Date.new(object.year, object.month, object.day), self)
  when String
    Arel::Nodes.build_quoted(Date.parse(object), self)
  when Date
    Arel::Nodes.build_quoted(object, self)
  else
    raise(ArgumentError, "#{object.class} can not be converted to Date")
  end
end

#convert_to_datetime_node(object) ⇒ Object 



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# File 'lib/arel_extensions/nodes/function.rb', line 119

def convert_to_datetime_node(object)
  case object
  when Arel::Attributes::Attribute, Arel::Nodes::Node
    object
  when DateTime, Time
    Arel::Nodes.build_quoted(object, self)
  when String
    Arel::Nodes.build_quoted(Time.parse(object), self)
  when Date
    Arel::Nodes.build_quoted(Time.utc(object.year, object.month, object.day, 0, 0, 0), self)
  else
    raise(ArgumentError, "#{object.class} can not be converted to Datetime")
  end
end

#convert_to_node(object) ⇒ Object 



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# File 'lib/arel_extensions/nodes/function.rb', line 51

def convert_to_node(object)
  case object
  when Arel::Attributes::Attribute, Arel::Nodes::Node, Integer
    object
  when DateTime
		  Arel::Nodes.build_quoted(object, self)
  when Time
    Arel::Nodes.build_quoted(object.strftime('%H:%M:%S'), self)
  when String
    Arel::Nodes.build_quoted(object)
  when Date
    Arel::Nodes.build_quoted(object.to_s, self)
  when NilClass
    Arel.sql('NULL')
  when ActiveSupport::Duration
    object.to_i
  else
    raise(ArgumentError, "#{object.class} can not be converted to CONCAT arg")
  end
end

#convert_to_number(object) ⇒ Object 



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# File 'lib/arel_extensions/nodes/function.rb', line 134

def convert_to_number(object)
  case object
  when Arel::Attributes::Attribute, Arel::Nodes::Node
    object
  when Integer
    object.to_i.abs
  when DateTime, Date, Time, String, ActiveSupport::Duration
    object.to_i.abs
  when NilClass
    0
  else
    raise(ArgumentError, "#{object.class} can not be converted to NUMBER arg")
  end
end

#convert_to_string_node(object) ⇒ Object 



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# File 'lib/arel_extensions/nodes/function.rb', line 72

def convert_to_string_node(object)
  case object
  when Arel::Nodes::Node
    object
  when Integer
    Arel::Nodes.build_quoted(object.to_s)
  when Arel::Attributes::Attribute
    case self.type_of_attribute(object)
    when :date
      ArelExtensions::Nodes::Format.new [object, 'yyyy-mm-dd']
    when :time
      ArelExtensions::Nodes::Format.new [object, '%H:%M:%S']
    else
      object
    end
  when DateTime
		  Arel::Nodes.build_quoted(object, self)
  when Time
    Arel::Nodes.build_quoted(object.strftime('%H:%M:%S'), self)
  when String
    Arel::Nodes.build_quoted(object)
  when Date
    Arel::Nodes.build_quoted(object, self)
  when NilClass
    Arel.sql('NULL')
  when ActiveSupport::Duration
    Arel::Nodes.build_quoted(object.to_i.to_s)
  else
    raise(ArgumentError, "#{object.class} can not be converted to CONCAT arg")
  end
end

#expr ⇒ Object 



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# File 'lib/arel_extensions/nodes/function.rb', line 24

def expr
 	@expressions.first
end

#left ⇒ Object 



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# File 'lib/arel_extensions/nodes/function.rb', line 28

def left
  @expressions.first
end

#return_type ⇒ Object

overrides as to make new Node like AliasPredication



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# File 'lib/arel_extensions/nodes/function.rb', line 15

def return_type 
		self.class.const_get(:RETURN_TYPE)
end

#right ⇒ Object 



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# File 'lib/arel_extensions/nodes/function.rb', line 32

def right
  @expressions[1]
end

#type_of_attribute(att) ⇒ Object 



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# File 'lib/arel_extensions/nodes/function.rb', line 36

def type_of_attribute(att)				
  case att
  when Arel::Attributes::Attribute
			begin  
				Arel::Table.engine.connection.schema_cache.columns_hash(att.relation.table_name)[att.name.to_s].type
			rescue
				att
			end
  when ArelExtensions::Nodes::Function
    att.return_type
#        else
#          nil
  end
end