Class: Arel::Visitors::SQLServer

Inherits:
ToSql
  • Object
show all
Defined in:
lib/composite_primary_keys/arel/sqlserver.rb

Instance Method Summary collapse

Methods inherited from ToSql

#visit_CompositePrimaryKeys_CompositeKeys

Instance Method Details

#make_Fetch_Possible_And_Deterministic(o) ⇒ Object 



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# File 'lib/composite_primary_keys/arel/sqlserver.rb', line 4

def make_Fetch_Possible_And_Deterministic o
  return if o.limit.nil? && o.offset.nil?
  t = table_From_Statement o
  pk = primary_Key_From_Table t
  return unless pk
  if o.orders.empty?
    # Prefer deterministic vs a simple `(SELECT NULL)` expr.
    # CPK
    #o.orders = [pk.asc]
    o.orders = pk.map {|a_pk| a_pk.asc}
  end
end

#primary_Key_From_Table(t) ⇒ Object 



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# File 'lib/composite_primary_keys/arel/sqlserver.rb', line 17

def primary_Key_From_Table t
  return unless t
  column_name = @connection.schema_cache.primary_keys(t.name) ||
    @connection.schema_cache.columns_hash(t.name).first.try(:second).try(:name)

  # CPK
  # column_name ? t[column_name] : nil
  case column_name
    when Array
      column_name.map do |name|
        t[name]
      end
    when NilClass
      nil
    else
      [t[column_name]]
  end
end