Estoy configurando formularios incrustados en mi aplicación de rieles.

Esto no funciona

<code><h1>PlayersToTeams#edit</h1>
<%= form_for @players_to_teams do |field| %>
  <%= field.fields_for @players_to_teams.player do |f| %>
    <%= f.label :IsActive %>
    <%= f.text_field :IsActive %>
  <% end %>
  <%= field.label :BT %>
  <%= field.text_field :BT %>
  <br/>
  <%= field.submit "Save", class: 'btn btn-primary' %>
<% end %> 
</code>

Me da unActiveRecord::AssociationTypeMismatch error. Observe la@players_to_teams.player en elforms_for línea.

Esto funciona:

<code><h1>PlayersToTeams#edit</h1>
<%= form_for @players_to_teams do |field| %>
    <%= field.fields_for :player do |f| %>
        <%= f.label :IsActive %>
        <%= f.text_field :IsActive %>
    <% end %>
    <%= field.label :BT %>
    <%= field.text_field :BT %>
    <br/>
    <%= field.submit "Save", class: 'btn btn-primary' %>
<% end %>
</code>

Observe la:player llamar alfields_for línea.

¿Cuál es la diferencia entre usar un símbolo y usar una instancia? Pensaría que me gustaría usar una instancia en este caso, pero supongo que no?

Editar

modelos:

<code>class Player < ActiveRecord::Base
  has_many :players_to_teams
  has_many :teams, through: :players_to_teams
end

class PlayersToTeam < ActiveRecord::Base
  belongs_to :player
  belongs_to :team

  accepts_nested_attributes_for :player
end
</code>

controlador:

<code>class PlayersToTeamsController < ApplicationController
  def edit
    @players_to_teams=PlayersToTeam.find(params[:id])
  end

  def update
    @players_to_teams=PlayersToTeam.find(params[:id])
    respond_to do |format|
      if @players_to_teams.update_attributes(params[:players_to_team])
        format.html { redirect_to @players_to_teams, notice: 'Player_to_Team was successfully updated.' }
        format.json { head :no_content }
      else
        format.html { render action: "edit" }
        format.json { render json: @players_to_teams.errors, status: :unprocessable_entity }
      end
    end
  end
end
</code>

Proyecto de ejemplo

Github:https://github.com/workmaster2n/embedded-form-errors