Module: ArelExtensions::Predications

Included in:
Arel::Nodes::Binary, Arel::Nodes::Function, Arel::Nodes::Grouping, Arel::Nodes::Unary, Attributes, Nodes::Case, Nodes::Function
Defined in:
lib/arel_extensions/predications.rb

Instance Method Summary collapse

Instance Method Details

#cast(right) ⇒ Object 



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# File 'lib/arel_extensions/predications.rb', line 19

def cast right
  ArelExtensions::Nodes::Cast.new([self, right])
end

#convert_to_node(object) ⇒ Object 



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# File 'lib/arel_extensions/predications.rb', line 79

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

#imatches(other, escape = nil) ⇒ Object 



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# File 'lib/arel_extensions/predications.rb', line 15

def imatches(other, escape = nil)
  ArelExtensions::Nodes::IMatches.new(self, other, escape)
end

#in(*other) ⇒ Object

In should handle nil element in the Array



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# File 'lib/arel_extensions/predications.rb', line 23

def in(*other) # In should handle nil element in the Array
  other = other.first if other.length <= 1
  case other
  when Range
    self.between(other)
  when Arel::Nodes::Grouping, ArelExtensions::Nodes::Union, ArelExtensions::Nodes::UnionAll
    Arel::Nodes::In.new(self, quoted_node(other))
  when Enumerable
    nils, values   = other.partition{ |v| v.nil? }
    ranges, values = values.partition{ |v| v.is_a?(Range) || v.is_a?(Arel::SelectManager)}
    # In order of (imagined) decreasing efficiency: nil, values, and then more complex.
    clauses =
      nils.uniq.map { |r| self.in(r) } \
      + (case values.uniq.size
          when 0 then []
          when 1 then [values[0].is_a?(Arel::Nodes::Grouping) ? self.in(values[0]) : self.eq(values[0])]
          else [Arel::Nodes::In.new(self, quoted_array(values))] end) \
      + ranges.uniq.map { |r| self.in(r) }
    clauses.empty? ? Arel.false : clauses.reduce(&:or)
  when nil
    self.is_null
  when Arel::SelectManager
    Arel::Nodes::In.new(self, other.ast)
  else
    Arel::Nodes::In.new(self, quoted_node(other))
  end
end

#matches(other, escape = nil, case_sensitive = nil) ⇒ Object 



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# File 'lib/arel_extensions/predications.rb', line 7

def matches(other, escape = nil, case_sensitive = nil)
  if Arel::VERSION.to_i < 7
    Arel::Nodes::Matches.new(self, Arel.quoted(other), escape)
  else
    Arel::Nodes::Matches.new(self, Arel.quoted(other), escape, case_sensitive)
  end
end

#not_in(*other) ⇒ Object

In should handle nil element in the Array



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# File 'lib/arel_extensions/predications.rb', line 51

def not_in(*other) # In should handle nil element in the Array
  other = other.first if other.length <= 1
  case other
  when Range
    Arel::Nodes::Not.new(self.between(other))
  when Arel::Nodes::Grouping, ArelExtensions::Nodes::Union, ArelExtensions::Nodes::UnionAll
    Arel::Nodes::NotIn.new(self, quoted_node(other))
  when Enumerable
    nils, values   = other.partition{ |v| v.nil? }
    ranges, values = values.partition{ |v| v.is_a?(Range) || v.is_a?(Arel::SelectManager)}
    # In order of (imagined) decreasing efficiency: nil, values, and then more complex.
    clauses =
      nils.uniq.map { |r| self.not_in(r) } \
      + (case values.uniq.size
          when 0 then []
          when 1 then [values[0].is_a?(Arel::Nodes::Grouping) ? self.not_in(values[0]) : self.not_eq(values[0])]
          else [Arel::Nodes::NotIn.new(self, quoted_array(values))] end) \
      + ranges.uniq.map { |r| self.not_in(r) }
    Arel::Nodes::And.new clauses
  when nil
    self.is_not_null
  when Arel::SelectManager
    Arel::Nodes::NotIn.new(self, other.ast)
  else
    Arel::Nodes::NotIn.new(self, quoted_node(other))
  end
end

#when(right, expression = nil) ⇒ Object 



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# File 'lib/arel_extensions/predications.rb', line 3

def when right, expression = nil
  ArelExtensions::Nodes::Case.new(self).when(right, expression)
end