I have built a custom form for creating a joining model on a has_many :through relationship. The models look roughly like this:
class Team
has_many :team_members
has_many :members, :through => :team_members
end
class Member
has_many :team_members
has_many :teams, :through => :team_members
end
class TeamMember
belongs_to :team
belongs_to :member
# and this model has some validations too
end
The form I have built is for selecting which members should be in a team. I won't paste the form, but it uses the form_tag method and basically sends an array of hashes which contain a member_id and a squad_number. I then update the database with an action that looks roughly like this (simplified a bit, but you get the jist):
@team.transaction do
@team.team_members = params[:team_members].collect{|tm| @team.team_members.new(tm)}
if @team.save
redirect_to ...
else
render :action => :members
end
end
Everything works great but I am validating the squad_number for uniqueness and numerically. So, when any of those validations fail, how do I get access to them in my view, and how do I ascertain which of the many members it has failed on?
