Class: Arel::Visitors::PostgreSQL

Inherits:
Object
  • Object
show all
Defined in:
lib/arel_extensions/visitors/postgresql.rb

Constant Summary collapse

DATE_MAPPING = 
{
  'd' => 'DAY', 'm' => 'MONTH', 'w' => 'WEEK', 'y' => 'YEAR', 'wd' => 'DOW',
  'h' => 'HOUR', 'mn' => 'MINUTE', 's' => 'SECOND'
}.freeze
DATE_FORMAT_DIRECTIVES = 
{
  '%Y' => 'YYYY', '%C' => 'CC', '%y' => 'YY',
  '%m' => 'MM', '%B' => 'TMMonth', '%^B' => 'TMMONTH', '%b' => 'TMMon', '%^b' => 'TMMON',
  '%V' => 'IW', '%G' => 'IYYY',                                                              # ISO week number and year of week
  '%d' => 'DD', '%e' => 'FMDD', '%j' => 'DDD', '%w' => '', '%a' => 'TMDy', '%A' => 'TMDay',  # day, weekday
  '%H' => 'HH24', '%k' => '', '%I' => 'HH', '%l' => '', '%P' => 'am', '%p' => 'AM',          # hours
  '%M' => 'MI', '%S' => 'SS', '%L' => 'MS', '%N' => 'US', '%z' => 'tz',                      # seconds, subseconds
  '%%' => '%',
}.freeze
NUMBER_COMMA_MAPPING = 
{
  'en_US' => '.,', 'fr_FR' => ',', 'sv_SE' => ', '
}.freeze

Instance Method Summary collapse

Instance Method Details

#visit_Aggregate_For_AggregateFunction(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 102

def visit_Aggregate_For_AggregateFunction o, collector
  if !o.order.blank? || !o.group.blank?
    collector << ' OVER ('
    if !o.group.blank?
      collector << ' PARTITION BY '
      o.group.each_with_index do |group, i|
        collector << COMMA if i != 0
        visit group, collector
      end
    end
    if !o.order.blank?
      collector << ' ORDER BY '
      o.order.each_with_index do |order, i|
        collector << COMMA if i != 0
        visit order, collector
      end
    end
    collector << ')'
  end
  collector
end

#visit_Arel_Attributes_Attribute(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 495

def visit_Arel_Attributes_Attribute o, collector
  join_name = o.relation.table_alias || o.relation.name
  if join_name.length > 63
    join_name = Arel.shorten(join_name)
  end
  collector << "#{quote_table_name join_name}.#{quote_column_name o.name}"
end

#visit_Arel_Nodes_As(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 82

def visit_Arel_Nodes_As o, collector
  if o.left.is_a?(Arel::Nodes::Binary)
    collector << '('
    collector = visit o.left, collector
    collector << ')'
  else
    collector = visit o.left, collector
  end
  collector << ' AS '

  # sometimes these values are already quoted, if they are, don't double quote it
  quote = o.right.is_a?(Arel::Nodes::SqlLiteral) && o.right[0] != '"' && o.right[-1] != '"'

  collector << '"' if quote
  collector = visit o.right, collector
  collector << '"' if quote

  collector
end

#visit_Arel_Nodes_NotRegexp(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 64

def visit_Arel_Nodes_NotRegexp o, collector
  collector = visit o.left, collector
  collector << ' !~ '
  collector = visit o.right, collector
  collector
end

#visit_Arel_Nodes_Regexp(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 56

def visit_Arel_Nodes_Regexp o, collector
  collector = visit o.left, collector
  collector << ' ~ '
  collector = visit o.right, collector
  collector
end

#visit_Arel_Nodes_SelectStatement(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 477

def visit_Arel_Nodes_SelectStatement o, collector

  if !(collector.value.blank? || (collector.value.is_a?(Array) && collector.value[0].blank?)) && o.limit.blank? && o.offset.blank?
    o = o.dup
    o.orders = []
  end
  old_visit_Arel_Nodes_SelectStatement(o, collector)
end

#visit_Arel_Nodes_TableAlias(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 487

def visit_Arel_Nodes_TableAlias o, collector
  if o.name.length > 63
    o = Arel::Table.new(o.table_name).alias(Arel.shorten(o.name))
  end
  old_visit_Arel_Nodes_TableAlias(o, collector)
end

#visit_ArelExtensions_Nodes_AiIMatches(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 224

def visit_ArelExtensions_Nodes_AiIMatches o, collector
  collector = visit o.left.ai_collate, collector
  collector << ' ILIKE '
  collector = visit o.right.ai_collate, collector
  if o.escape
    collector << ' ESCAPE '
    visit o.escape, collector
  else
    collector
  end
end

#visit_ArelExtensions_Nodes_AiMatches(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 212

def visit_ArelExtensions_Nodes_AiMatches o, collector
  collector = visit o.left.ai_collate, collector
  collector << ' LIKE '
  collector = visit o.right.ai_collate, collector
  if o.escape
    collector << ' ESCAPE '
    visit o.escape, collector
  else
    collector
  end
end

#visit_ArelExtensions_Nodes_Cast(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 378

def visit_ArelExtensions_Nodes_Cast o, collector
  as_attr =
    case o.as_attr
    when :string
      'varchar'
    when :text, :ntext
      'text'
    when :time
      'time'
    when :int
      collector << 'CAST(CAST('
      collector = visit o.left, collector
      collector << ' AS numeric) AS int)'
      return collector
    when :number, :decimal, :float
      'numeric'
    when :datetime
      'timestamp with time zone'
    when :date
      'date'
    when :binary
      'binary'
    when :jsonb
      'jsonb'
    else
      o.as_attr.to_s
    end

  collector << 'CAST('
  collector = visit o.left, collector
  collector << ' AS '
  collector = visit Arel::Nodes::SqlLiteral.new(as_attr), collector
  collector << ')'
  collector
end

#visit_ArelExtensions_Nodes_Collate(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 248

def visit_ArelExtensions_Nodes_Collate o, collector
  if o.ai
    collector << 'unaccent('
    collector = visit o.expressions.first, collector
    collector << ')'
  elsif o.ci
    collector = visit o.expressions.first, collector
  else
    collector = visit o.expressions.first, collector
  end
  collector
end

#visit_ArelExtensions_Nodes_Concat(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 71

def visit_ArelExtensions_Nodes_Concat o, collector
  collector << '('
  o.expressions.each_with_index { |arg, i|
    collector = visit arg, collector
    collector << ' || ' unless i == o.expressions.length - 1
  }
  collector << ')'
  collector
end

#visit_ArelExtensions_Nodes_DateAdd(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 261

def visit_ArelExtensions_Nodes_DateAdd o, collector
  collector = visit o.left, collector
  collector << ' + ' # (o.right.value >= 0 ? ' + ' : ' - ')
  collector = visit o.postgresql_value(o.right), collector
  collector
end

#visit_ArelExtensions_Nodes_DateDiff(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 268

def visit_ArelExtensions_Nodes_DateDiff o, collector
  if o.right_node_type == :ruby_date || o.right_node_type == :ruby_time || o.right_node_type == :date || o.right_node_type == :datetime || o.right_node_type == :time
    collector << if o.left_node_type == :ruby_time || o.left_node_type == :datetime || o.left_node_type == :time
                   "DATEDIFF('second', "
                else
                  "DATEDIFF('day', "
                end
    collector = visit o.right, collector
    collector << (o.right_node_type == :date ? '::date' : '::timestamp')
    collector << COMMA
    collector = visit o.left, collector
    collector << (o.left_node_type == :date ? '::date' : '::timestamp')
    collector << ')'
  else
    collector << '('
    collector = visit o.left, collector
    collector << ' - ('
    if o.right.is_a?(ArelExtensions::Nodes::Duration)
      o.right.with_interval = true
    end
    collector = visit o.right, collector
    collector << '))'
  end
  collector
end

#visit_ArelExtensions_Nodes_Duration(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 294

def visit_ArelExtensions_Nodes_Duration o, collector
  if o.with_interval
    interval = case o.left
      when  'd', 'm', 'y'
        'DAY'
      when 'h', 'mn', 's'
        'SECOND'
      when /i\z/
        collector << '('
        collector = visit o.right, collector
        collector << ')'
        collector << " * (INTERVAL '1' #{DATE_MAPPING[o.left[0..-2]]})"
        return collector
      end
  end
  collector << "EXTRACT(#{DATE_MAPPING[o.left]} FROM CAST("
  collector = visit o.right, collector
  collector << ' AS TIMESTAMP WITH TIME ZONE))'
  collector << " * (INTERVAL '1' #{interval})" if interval && o.with_interval
  collector
end

#visit_ArelExtensions_Nodes_Format(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 176

def visit_ArelExtensions_Nodes_Format o, collector
  visit_ArelExtensions_Nodes_FormattedDate o, collector
end

#visit_ArelExtensions_Nodes_FormattedDate(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 180

def visit_ArelExtensions_Nodes_FormattedDate o, collector
  fmt = ArelExtensions::Visitors::strftime_to_format(o.iso_format, DATE_FORMAT_DIRECTIVES)
  collector << 'TO_CHAR('
  collector << '(' if o.time_zone
  collector = visit o.left, collector
  case o.time_zone
  when Hash
    src_tz, dst_tz = o.time_zone.first
    collector << ') AT TIME ZONE '
    collector = visit Arel.quoted(src_tz), collector
    collector << ' AT TIME ZONE '
    collector = visit Arel.quoted(dst_tz), collector
  when String
    collector << ') AT TIME ZONE '
    collector = visit Arel.quoted(o.time_zone), collector
  end
  collector << COMMA
  collector = visit Arel.quoted(fmt), collector
  collector << ')'
  collector
end

#visit_ArelExtensions_Nodes_FormattedNumber(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 414

def visit_ArelExtensions_Nodes_FormattedNumber o, collector
  col = o.left.coalesce(0)
  comma = o.precision == 0 ? '' : (NUMBER_COMMA_MAPPING[o.locale][0] || '.')
  thousand_separator = NUMBER_COMMA_MAPPING[o.locale][1] || (NUMBER_COMMA_MAPPING[o.locale] ? '' : 'G')
  nines_after = (1..o.precision).map{'9'}.join('')
  nines_before = ("999#{thousand_separator}" * 4 + '990')

  sign = Arel.when(col < 0).
            then('-').
            else(o.flags.include?('+') ? '+' : (o.flags.include?(' ') ? ' ' : ''))
  sign_length = ArelExtensions::Nodes::Length.new([sign])

  number =
    if o.scientific_notation
      ArelExtensions::Nodes::Concat.new([
          Arel::Nodes::NamedFunction.new('TRIM', [
            Arel::Nodes::NamedFunction.new('TO_CHAR', [
              Arel.when(col.not_eq 0).then(col.abs / Arel.quoted(10).pow(col.abs.log10.floor)).else(1),
              Arel.quoted("FM#{nines_before}\"#{comma}\"V#{nines_after}")
            ])]),
          o.type,
          Arel::Nodes::NamedFunction.new('TRIM', [
            Arel::Nodes::NamedFunction.new('TO_CHAR', [
              Arel.when(col.not_eq 0).then(col.abs.log10.floor).else(0),
              Arel.quoted("FM#{nines_before}")
            ])])
        ])
    else
      Arel::Nodes::NamedFunction.new('TRIM', [
        Arel::Nodes::NamedFunction.new('TO_CHAR', [
          Arel.quoted(col.abs),
          Arel.quoted("FM#{nines_before}\"#{comma}\"V#{nines_after}")
        ])])
    end

  repeated_char =
    if o.width == 0
      Arel.quoted('')
    else
      Arel
        .when(Arel.quoted(o.width).abs - (number.length + sign_length) > 0)
        .then(Arel.quoted(
                o.flags.include?('-') ? ' ' : (o.flags.include?('0') ? '0' : ' ')
              ).repeat(Arel.quoted(o.width).abs - (number.length + sign_length))
             )
        .else('')
    end
  before = !o.flags.include?('0') && !o.flags.include?('-') ? repeated_char : ''
  middle = o.flags.include?('0') && !o.flags.include?('-')  ? repeated_char : ''
  after  = o.flags.include?('-') ? repeated_char : ''
  full_number = ArelExtensions::Nodes::Concat.new([
      before,
      sign,
      middle,
      number,
      after
    ])
  collector = visit ArelExtensions::Nodes::Concat.new([Arel.quoted(o.prefix), full_number, Arel.quoted(o.suffix)]), collector
  collector
end

#visit_ArelExtensions_Nodes_GroupConcat(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 124

def visit_ArelExtensions_Nodes_GroupConcat o, collector
  collector << 'array_to_string(array_agg('
  collector = visit o.left, collector
  if o.order && !o.order.blank?
    collector << ' ORDER BY'
    o.order.each_with_index do |order, i|
      collector << COMMA if i != 0
      collector << ' '
      visit order, collector
    end
  end
  collector << ')'
  o.order = nil
  visit_Aggregate_For_AggregateFunction o, collector
  collector << COMMA
  collector =
    if o.separator && o.separator != 'NULL'
      visit o.separator, collector
    else
      visit Arel.quoted(','), collector
    end
  collector << ')'
  collector
end

#visit_ArelExtensions_Nodes_IsNotNull(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 357

def visit_ArelExtensions_Nodes_IsNotNull o, collector
  collector = visit o.expr, collector
    collector << ' IS NOT NULL'
    collector
end

#visit_ArelExtensions_Nodes_IsNull(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 351

def visit_ArelExtensions_Nodes_IsNull o, collector
  collector = visit o.expr, collector
  collector << ' IS NULL'
  collector
end

#visit_ArelExtensions_Nodes_Json(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 519

def visit_ArelExtensions_Nodes_Json o, collector
  case o.dict
  when Array
    collector << 'to_jsonb(array['
    o.dict.each.with_index do |v, i|
      if i != 0
        collector << Arel::Visitors::MySQL::COMMA
      end
      collector = visit v, collector
    end
    collector << '])'
  when Hash
    collector << 'jsonb_build_object('
    o.dict.each.with_index do |(k, v), i|
      if i != 0
        collector << Arel::Visitors::MySQL::COMMA
      end
      collector = visit k, collector
      collector << Arel::Visitors::MySQL::COMMA
      collector = visit v, collector
    end
    collector << ')'
  when String, Numeric, TrueClass, FalseClass
    collector = visit Arel.quoted("#{o.dict}"), collector
    collector << '::jsonb'
  when NilClass
    collector << %Q['null'::jsonb]
  else
    collector = visit o.dict, collector
    collector << '::jsonb'
  end
  collector
end

#visit_ArelExtensions_Nodes_JsonGet(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 563

def visit_ArelExtensions_Nodes_JsonGet o, collector
  collector = visit o.dict, collector
  collector << ' ->> '
  collector = visit o.key, collector
  collector
end

#visit_ArelExtensions_Nodes_JsonGroup(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 584

def visit_ArelExtensions_Nodes_JsonGroup o, collector
  if o.as_array
    collector << 'jsonb_agg('
    collector = visit o.dict, collector
    collector << ')'
  else
    case o.dict
    when Hash
      o.dict.each.with_index do |(k, v), i|
        if i != 0
          collector << ' || '
        end
        collector << 'jsonb_object_agg('
        collector = visit k, collector
        collector << Arel::Visitors::MySQL::COMMA
        collector = visit v, collector
        collector << ')'
      end
    else
      collector << 'jsonb_object_agg('
      collector = visit o.dict, collector
      collector << ')'
    end
  end
  collector
end

#visit_ArelExtensions_Nodes_JsonMerge(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 553

def visit_ArelExtensions_Nodes_JsonMerge o, collector
  o.expressions.each.with_index do |v, i|
    if i != 0
      collector << ' || '
    end
    collector = visit v, collector
  end
  collector
end

#visit_ArelExtensions_Nodes_JsonSet(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 570

def visit_ArelExtensions_Nodes_JsonSet o, collector
  collector << 'jsonb_set('
  collector = visit o.dict, collector
  collector << Arel::Visitors::MySQL::COMMA
  collector << 'array['
  collector = visit o.key, collector
  collector << ']'
  collector << Arel::Visitors::MySQL::COMMA
  collector = visit o.value, collector
  collector << Arel::Visitors::MySQL::COMMA
  collector << 'true)'
  collector
end

#visit_ArelExtensions_Nodes_Locate(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 316

def visit_ArelExtensions_Nodes_Locate o, collector
  collector << 'POSITION('
  collector = visit o.right, collector
  collector << ' IN '
  collector = visit o.left, collector
  collector << ')'
  collector
end

#visit_ArelExtensions_Nodes_Log10(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 44

def visit_ArelExtensions_Nodes_Log10 o, collector
  collector << 'LOG('
  o.expressions.each_with_index { |arg, i|
    collector << Arel::Visitors::ToSql::COMMA if i != 0
    collector = visit arg, collector
  }
  collector << ')'
  collector
end

#visit_ArelExtensions_Nodes_Ltrim(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 158

def visit_ArelExtensions_Nodes_Ltrim o, collector
  collector << 'TRIM(LEADING '
  collector = visit o.right, collector
  collector << ' FROM '
  collector = visit o.left, collector
  collector << ')'
  collector
end

#visit_ArelExtensions_Nodes_Power(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 34

def visit_ArelExtensions_Nodes_Power o, collector
  collector << 'POWER('
  o.expressions.each_with_index { |arg, i|
    collector << Arel::Visitors::ToSql::COMMA if i != 0
    collector = visit arg, collector
  }
  collector << ')'
  collector
end

#visit_ArelExtensions_Nodes_Rand(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 23

def visit_ArelExtensions_Nodes_Rand o, collector
  collector << 'RANDOM('
  if (o.left != nil && o.right != nil)
    collector = visit o.left, collector
    collector << COMMA
    collector = isit o.right, collector
  end
  collector << ')'
  collector
end

#visit_ArelExtensions_Nodes_RegexpReplace(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 335

def visit_ArelExtensions_Nodes_RegexpReplace o, collector
  collector << 'REGEXP_REPLACE('
  visit o.left, collector
  collector << Arel::Visitors::ToSql::COMMA
  tab = o.pattern.inspect + 'g' # Make it always global
  pattern = tab.split('/')[1..-2].join('/')
  flags = tab.split('/')[-1]
  visit Arel.quoted(pattern), collector
  collector << Arel::Visitors::ToSql::COMMA
  visit o.substitute, collector
  collector << Arel::Visitors::ToSql::COMMA
  visit Arel.quoted(flags + 'g'), collector
  collector << ')'
  collector
end

#visit_ArelExtensions_Nodes_Repeat(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 202

def visit_ArelExtensions_Nodes_Repeat o, collector
  collector << 'REPEAT('
  o.expressions.each_with_index { |arg, i|
    collector << Arel::Visitors::ToSql::COMMA if i != 0
    collector = visit arg, collector
  }
  collector << ')'
  collector
end

#visit_ArelExtensions_Nodes_Rtrim(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 167

def visit_ArelExtensions_Nodes_Rtrim o, collector
  collector << 'TRIM(TRAILING '
  collector = visit o.right, collector
  collector << ' FROM '
  collector = visit o.left, collector
  collector << ')'
  collector
end

#visit_ArelExtensions_Nodes_SMatches(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 236

def visit_ArelExtensions_Nodes_SMatches o, collector
  collector = visit o.left, collector
  collector << ' LIKE '
  collector = visit o.right, collector
  if o.escape
    collector << ' ESCAPE '
    visit o.escape, collector
  else
    collector
  end
end

#visit_ArelExtensions_Nodes_Std(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 503

def visit_ArelExtensions_Nodes_Std o, collector
  collector << (o.unbiased_estimator ? 'STDDEV_SAMP(' : 'STDDEV_POP(')
  visit o.left, collector
  collector << ')'
  visit_Aggregate_For_AggregateFunction o, collector
  collector
end

#visit_ArelExtensions_Nodes_Substring(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 325

def visit_ArelExtensions_Nodes_Substring o, collector
  collector << 'SUBSTR('
  o.expressions.each_with_index { |arg, i|
    collector << COMMA if i != 0
    collector = visit arg, collector
  }
  collector << ')'
  collector
end

#visit_ArelExtensions_Nodes_Sum(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 363

def visit_ArelExtensions_Nodes_Sum o, collector
  collector << 'sum('
  collector = visit o.expr, collector
  collector << ')'
  visit_Aggregate_For_AggregateFunction o, collector
  collector
end

#visit_ArelExtensions_Nodes_Trim(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 149

def visit_ArelExtensions_Nodes_Trim o, collector
  collector << 'TRIM(BOTH '
  collector = visit o.right, collector
  collector << ' FROM '
  collector = visit o.left, collector
  collector << ')'
  collector
end

#visit_ArelExtensions_Nodes_Variance(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 511

def visit_ArelExtensions_Nodes_Variance o, collector
  collector << (o.unbiased_estimator ? 'VAR_SAMP(' : 'VAR_POP(')
  visit o.left, collector
  collector << ')'
  visit_Aggregate_For_AggregateFunction o, collector
  collector
end

#visit_ArelExtensions_Nodes_Wday(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/postgresql.rb', line 371

def visit_ArelExtensions_Nodes_Wday o, collector
  collector << 'EXRTACT(DOW, '
  collector = visit o.date, collector
  collector << ')'
  collector
end