trying to setup a basic join :has_many :through

I have a basic Users / Memberships / Groups

I want a user to navigate to the Groups#show if the user is logged in they are shown a "Join" button, if the user is not logged they are offered a link to the login/registration.

I can handle the if logged in stuff using devise. The piece I don't know how to do is the Join... The real piece I am trying to figure out is the view code I think. I don't need anyone to write the code. just point me in the right direction and I'll figure it out...

I have all the basic code for this setup. The the tables are created, the models exist... the relationship is instantiated.

My current membership controller

def create
  @membership = current_user.memberships.build(:group_id => params[:group_id])
  if @membership.save
    flash[:notice] = "You have joined this group."
    redirect_to :back
  else
    flash[:error] = "Unable to join."
    redirect_to :back
  end
end

def destroy
  @membership = current_user.memberships.find(param开发者_Go百科s[:id])
  @membership.destroy
  flash[:notice] = "Removed membership."
      redirect_to :back
end

end

any direction would be great

You say you don't want the actual code, so here are a few pointers:

• You need a form.
• This form needs to post to the create action you've shown in your question.
• You need to post the correct group_id.

Do you need any more pointers? Check out the Rails Guides, they're pretty good!