Rails 4：验证后维护表单输入

Question

我的Locations#show 视图上有一个用于不同型号 (PotentialClient) 的表单。当我的表单验证失败时，重定向会清空所有字段，因为我需要初始化一个新的 potential_client 以加载视图。

如何更改此设置，以便在验证失败后填充字段？

# LocationsController
def show
    @potential_client = PotentialClient.new
end

# class PotentialClient < ActiveRecord::Base
validates_presence_of :name, :email, :phone

# PotentialClientsController
def create
    @potential_client = PotentialClient.new(potential_client_params)
    respond_to do |format|
        if @potential_client.save
            format.html { redirect_to Location.find(@potential_client.location_id), notice: 'Success!' }
        else
            format.html { redirect_to Location.find(@potential_client.location_id), notice: 'Failure!' }
        end
    end
end

# Form in /locations/show
<%= simple_form_for [ @location, @potential_client ] do |f| %>

    <%= f.input :name %>
    <%= f.input :email %>
    <%= f.label :phone %>
    <%= f.input :message %>
    <%= f.hidden_field :location_id, value: @location.id %>

    <%= f.submit "Submit" %>

<% end %>

Answer 1

由于您正在重定向到另一个页面，浏览器将发送新请求。所以服务器不会知道先前请求中发生了什么。您需要使用会话在请求之间共享数据

def show
  @potential_client = session[:potential_client] || PotentialClient.new
end


# PotentialClientsController
def create
  @potential_client = PotentialClient.new(potential_client_params)
  respond_to do |format|
    if @potential_client.save
      format.html { redirect_to Location.find(@potential_client.location_id), notice: 'Success!' }
    else
      session[:potential_client] = @potential_client
      format.html { redirect_to Location.find(@potential_client.location_id), notice: 'Failure!' }
    end
  end
end