我有以下型号

城市(id,name,geo {lng,lat})

地理位置(LNG,LAT)

城市模型

class City
  include Mongoid::Document
  include Mongoid::Timestamps

  field :name, type: String
  field :timezone, type: String
  field :slug, type: String

  belongs_to :region
  belongs_to :country

  embeds_one :geo_location
  accepts_nested_attributes_for :geo_location
end

地理位置模型

class GeoLocation
  include Mongoid::Document
  include Mongoid::Timestamps

  field :lng, type: String
  field :lat, type: String

  embedded_in :city
end

城市控制员

class CitiesController < ApplicationController
  before_action :set_city, only: [:show, :edit, :update, :destroy]

  # GET /cities
  def index
    @cities = City.all
  end

  # GET /cities/1
  def show
  end

  # GET /cities/new
  def new
    @city = City.new
    @regions = Region.all.asc(:name)
    @countries = Country.all.asc(:name)
  end

  # GET /cities/1/edit
  def edit
    @regions = Region.all.asc(:name)
    @countries = Country.all.asc(:name)
  end

  # POST /cities
  def create
    @city = City.new(city_params)

    if @city.save
      redirect_to @city, notice: 'City was successfully created.'
    else
      render action: 'new'
    end
  end

  # PATCH/PUT /cities/1
  def update
    if @city.update(city_params)
      redirect_to @city, notice: 'City was successfully updated.'
    else
      render action: 'edit'
    end
  end

  # DELETE /cities/1
  def destroy
    @city.destroy
    redirect_to cities_url, notice: 'City was successfully destroyed.'
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_city
      @city = City.find(params[:id])
    end

    # Only allow a trusted parameter "white list" through.
    def city_params
      params.require(:city).permit(:name, :timezone, :region_id, :country_id, :slug, :geo_locations_attributes => [:id, :lag, :lat])
    end
end

形成:

<%= form_for(@city) do |f| %>
  <% if @city.errors.any? %>
    

      
<%= pluralize(@city.errors.count, "error") %> prohibited this city from being saved:

      

      <% @city.errors.full_messages.each do |msg| %>
        
<%= msg %>
      <% end %>
      
    
  <% end %>

  

    <%= f.label :name %>

    <%= f.text_field :name %>
  
  

    <%= f.label :country %>

    <%= f.collection_select :country_id, @countries, :id, :name, :prompt => "Please Select" %>
  
  

    <%= f.label :region %>

    <%= f.collection_select :region_id, @regions, :id, :name, :prompt => "Please Select" %>
  
  

    <%= f.label :timezone %>

    <%= f.text_field :timezone %>
  
  

    <%= f.label :slug %>

    <%= f.text_field :slug %>
  

  <%= f.fields_for :geo_locations do |geo_location| %>
    

      <%= geo_location.label :lag %>

      <%= geo_location.text_field :lag %>
    
    

      <%= geo_location.label :lat %>

      <%= geo_location.text_field :lat %>
    
  <% end %>

  

    <%= f.submit %>
  
<% end %>

新观点

New city

<%= render 'form' %>

<%= link_to 'Back', cities_path %>

我得到的错误

未允许的参数:geo_location

Ranjithkumar.. 5

在控制器上,用这个替换你的city_params方法,

def city_params
  params.require(:city).permit(:name, :timezone, :region_id, :country_id, :slug, :geo_location_attributes => [:id, :lag, :lat])
end

在视图上,将此" f.fields_for:geo_locations "替换为" f.fields_for:geo_location "

geo_locations_attributes中的问题.它应该是geo_location_attributes,因为这是一对一的关系.