How to order included elements in Rails 3
Try this in your Today model:
has_many :tasks, :order => 'priority DESC'EDIT: As mentioned in comment below, in Rails 4+, this is now:
has_many :tasks, -> { order(:priority => :desc) }
Direct solution would be to include the tasks table name before priority:
Today.where(:user_id => current_user.id).includes(:tasks).order('tasks.priority').first# joins(:tasks) is not requiredOr, if you don't want to have the table name hardcoded, you can merge with scope from Task model:
Today.where(:user_id => current_user.id).joins(:tasks).includes(:tasks).merge(Task.order(:priority)).first# joins(:tasks) here is requiredAlso, you can add has_many: todays to User model to ditch the where clause and do:
current_user.todays.includes(:tasks).order('tasks.priority').first# orcurrent_user.todays.joins(:tasks).includes(:tasks).merge(Task.order(:priority)).firstBut if you need only/always to order by priority, and do not need other different orderings, adding order to has_many :tasks is easier.