Module: ConstantTableSaver::ActiveRecord4ClassMethods

Defined in:

lib/constant_table_saver.rb

Instance Method Summary

• #_to_sql_with_binds(sql, binds) ⇒ Object
• #find_by_sql(sql, binds = []) ⇒ Object

Instance Method Details

#_to_sql_with_binds(sql, binds) ⇒ Object

# File 'lib/constant_table_saver.rb', line 188

def _to_sql_with_binds(sql, binds)
  if sql.respond_to?(:to_sql)
    # an arel object
    connection.to_sql(sql, binds)
  else
    # a plain string
    sql
  end
end

#find_by_sql(sql, binds = []) ⇒ Object

# File 'lib/constant_table_saver.rb', line 156

def find_by_sql(sql, binds = [])
  @find_by_sql ||= {
    :all   => relation.to_sql,
    :id    => relation.where(relation.table[primary_key].eq(connection.substitute_at(columns_hash[primary_key], 0))).limit(1).
                tap {|r| r.bind_values += [[columns_hash[primary_key], :undefined]]}. # work around AR 4.1.9-4.1.x (but not 4.2.x) calling nil.first if there's no bind_values
                arel,
    :first => relation.order(relation.table[primary_key].asc).limit(1).to_sql,
    :last  => relation.order(relation.table[primary_key].desc).limit(1).to_sql,
  }

  if binds.empty?
    _sql = _to_sql_with_binds(sql, binds)

    if _sql == @find_by_sql[:all]
      return @cached_records ||= super(relation.to_sql).each(&:freeze)
    elsif _sql == @find_by_sql[:first]
      return [relation.to_a.first].compact
    elsif _sql == @find_by_sql[:last]
      return [relation.to_a.last].compact
    end

  elsif binds.length == 1 &&
        binds.first.first.is_a?(ActiveRecord::ConnectionAdapters::Column) &&
        binds.first.first.name == primary_key &&
        _to_sql_with_binds(sql, binds) == _to_sql_with_binds(@find_by_sql[:id], binds) # we have to late-render the find(id) SQL because mysql2 on 4.1 and later requires the bind variables to render the SQL, and errors out with a nil dereference otherwise
    @cached_records_by_id ||= relation.to_a.index_by {|record| record.id.to_param}
    return [@cached_records_by_id[binds.first.last.to_param]].compact
  end

  super
end