Question

用户可以选择两个提交按钮之一。如果他点击<%= f.submit :conceal %>，如何将默认值从false更改为true？

t.boolean  "conceal",           default: false

因为现在如果用户点击按钮 - 默认值仍为false：

[1] pry(main)> Valuation.find(9)
  Valuation Load (0.2ms)  SELECT  "valuations".* FROM "valuations" WHERE "valuations"."id" = ? LIMIT 1  [["id", 9]]
=> #<Valuation:0x007fdf26c736b8
 id: 9,
 conceal: false,
 user_id: 1,
 created_at: Thu, 23 Apr 2015 16:21:31 UTC +00:00,
 updated_at: Thu, 23 Apr 2015 16:21:31 UTC +00:00,
 likes: nil,
 name: "Conceal/Private/Hide">

这不起作用<%= f.submit :conceal => true %>。

class ValuationsController < ApplicationController
  before_action :set_valuation, only: [:show, :edit, :update, :destroy, :like]
  before_action :logged_in_user, only: [:create, :destroy]

  def index
    if params[:tag]
      @valuations = Valuation.tagged_with(params[:tag])
    else
      @valuations = Valuation.order('RANDOM()')
    end
  end

  def show
    @valuation = Valuation.find(params[:id])
    @commentable = @valuation
    @comments = @commentable.comments
    @comment = Comment.new
  end

  def new
    @valuation = current_user.valuations.build
  end

  def edit
  end

  def create
    @valuation = current_user.valuations.build(valuation_params)
    if @valuation.save
      track_activity @valuation
      redirect_to @valuation, notice: 'Value was successfully created'
    else
      @feed_items = []
      render 'pages/home'
  end
end

  def update
    if @valuation.update(valuation_params)
      track_activity @valuation
      redirect_to @valuation, notice: 'Value was successfully updated'
    else
      render action: 'edit'
  end
end

  def destroy
    @valuation.destroy
    redirect_to valuations_url
  end

  def like
    without_tracking do
      @valuation.increment!(:likes)
    end
    @valuation.create_activity :like
    flash[:success] = 'Thanks for sharing your Value!'
    redirect_to valuation_path(@valuation)
  end

private

    def without_tracking
      Valuation.public_activity_off
      yield if block_given?
      Valuation.public_activity_on
    end

    def set_valuation
      @valuation = Valuation.find(params[:id])
    end

    def correct_user
      @valuation = current_user.valuations.find_by(id: params[:id])
      redirect_to valuations_path, notice: "Not authorized to edit this valuation" if @valuation.nil?
    end

    def valuation_params
      params.require(:valuation).permit(:name, :conceal, :tag_list, :content, :commentable, :comment, :like)
    end
end

更新

Started POST "/valuations" for 127.0.0.1 at 2015-04-23 15:27:35 -0400
Processing by ValuationsController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"Xd4ISNLZxjryLJfxvauWUANBzJthCNBzUwhtxseB/ird77mdYoKY/f9Skzb68lClaWOIUJXie9qC0jI1l+d98w==", "valuation"=>{"name"=>"PRIVATE AGAIN", "tag_list"=>""}, "commit"=>"conceal"}
  [1m[36mUser Load (0.7ms)[0m  [1mSELECT  "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1[0m  [["id", 1]]
  [1m[35mHabit Load (0.2ms)[0m  SELECT "habits".* FROM "habits" WHERE "habits"."user_id" = ?  [["user_id", 1]]
  [1m[36mHabit Load (0.2ms)[0m  [1mSELECT "habits".* FROM "habits"[0m
  [1m[35mActsAsTaggableOn::Tag Load (0.2ms)[0m  SELECT "tags".* FROM "tags" WHERE (LOWER(name) = LOWER('ingrain'))
  [1m[36m (0.1ms)[0m  [1mbegin transaction[0m
  [1m[35mSQL (31.7ms)[0m  INSERT INTO "valuations" ("name", "user_id", "created_at", "updated_at") VALUES (?, ?, ?, ?)  [["name", "PRIVATE AGAIN"], ["user_id", 1], ["created_at", "2015-04-23 19:27:36.015267"], ["updated_at", "2015-04-23 19:27:36.015267"]]
  [1m[36mActsAsTaggableOn::Tag Load (0.1ms)[0m  [1mSELECT "tags".* FROM "tags" INNER JOIN "taggings" ON "tags"."id" = "taggings"."tag_id" WHERE "taggings"."taggable_id" = ? AND "taggings"."taggable_type" = ? AND (taggings.context = 'tags' AND taggings.tagger_id IS NULL)[0m  [["taggable_id", 15], ["taggable_type", "Valuation"]]
  [1m[35m (10.8ms)[0m  commit transaction
  [1m[36m (0.1ms)[0m  [1mbegin transaction[0m
  [1m[35mSQL (1.7ms)[0m  INSERT INTO "activities" ("action", "trackable_id", "trackable_type", "user_id", "created_at", "updated_at") VALUES (?, ?, ?, ?, ?, ?)  [["action", "create"], ["trackable_id", 15], ["trackable_type", "Valuation"], ["user_id", 1], ["created_at", "2015-04-23 19:27:36.136688"], ["updated_at", "2015-04-23 19:27:36.136688"]]
  [1m[36m (1.5ms)[0m  [1mcommit transaction[0m
Redirected to http://0.0.0.0:3000/valuations/15

Answer 1

submit方法会显示它将显示的名称的参数，但这仅用于确定哪个按钮（如果有多个按钮）用于提交形式。

您要做的是介绍一个具有正确命名约定的隐藏字段，以便您可以使用update_attributes，或者您需要测试是否存在params[:commit]，如果存在，则表示某人按下那个按钮：

if (params[:commit] == 'conceal')
  @valuation.conceal = true
end

如何通过提交按钮更改默认布尔值？

更新

1 个答案: