Rails 测试错误：WHERE 的参数必须是布尔类型，而不是整数类型

用户可以通过 has_many 关联为帖子投票。我在运行测试时收到此错误：

ActiveRecord::StatementInvalid: PG::DatatypeMismatch: ERROR: argument of WHERE must be type boolean, not type integer

从这个测试来看：

test "should unvote a post the standard way" do
  @user.vote(@post_2)
  postvoterelationship = @user.active_post_vote_relationships.find_by(voted_id: @post_2.id)
  assert_difference '@user.postvoting.count', -1 do
    delete postvoterelationship_path(postvoterelationship)
  end
end

postvoterelationships_controller.rb

def destroy
  @user = Postvoterelationship.find(params[:id]).voter
  @post = Postvoterelationship.find_by(params[:id]).voted
  @user.unvote(@post)
  respond_to do |format|
    format.html do
      redirect_to @user
    end
    format.js
  end
end # destroy

路线.rb

resources :postvoterelationships,  only: [:create, :destroy]

后投票关系.rb

class Postvoterelationship < ActiveRecord::Base
  belongs_to :voter, class_name: "User"
  belongs_to :voted, class_name: "Post"
  validates  :voter_id, presence: true
  validates  :voted_id, presence: true
end

user.rb

has_many :postvoting, through: :active_post_vote_relationships, source: :voted

EDIT:

服务器日志：

Started DELETE "/postvoterelationships/207" for ::1 at 2015-06-16 21:02:07 +0100
Processing by PostvoterelationshipsController#destroy as JS
Parameters: {"utf8"=>"✓", "authenticity_token"=>"bP17sWN2k6lFqnNxEa6NNEO5yWXkGopi9PSXLIEKzooR3XUfF4chhS3+W+9WP8EB3GwzfhsauAyPiIp1/kkh9A==", "commit"=>"Unvote", "id"=>"207"}
Character Load (0.3ms)  SELECT  "characters".* FROM "characters" WHERE "characters"."callsign" = $1 LIMIT 1  [["callsign", "bazzer"]]
User Load (0.4ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = $1 LIMIT 1  [["id", 1]]
Postvoterelationship Load (1.2ms)  SELECT  "postvoterelationships".* FROM "postvoterelationships" WHERE "postvoterelationships"."id" = $1 LIMIT 1  [["id", 207]]
Character Load (0.7ms)  SELECT  "characters".* FROM "characters" WHERE "characters"."id" = $1 LIMIT 1  [["id", 1]]
Postvoterelationship Load (1.8ms)  SELECT  "postvoterelationships".* FROM "postvoterelationships" WHERE (207) LIMIT 1
PG::DatatypeMismatch: ERROR:  argument of WHERE must be type boolean, not type integer
LINE 1: ...ationships".* FROM "postvoterelationships" WHERE (207) LIMIT...
                                                         ^
: SELECT  "postvoterelationships".* FROM "postvoterelationships" WHERE (207) LIMIT 1
Completed 500 Internal Server Error in 14ms (ActiveRecord: 4.3ms)

ActiveRecord::StatementInvalid (PG::DatatypeMismatch: ERROR:  argument of WHERE must be type boolean, not type integer
LINE 1: ...ationships".* FROM "postvoterelationships" WHERE (207) LIMIT...
                                                         ^
: SELECT  "postvoterelationships".* FROM "postvoterelationships" WHERE (207) LIMIT 1):
app/controllers/postvoterelationships_controller.rb:24:in `destroy'

您是否尝试过查看所做的 SQL 查询？您可以在测试环境中展示它们，检查这个问题 https://stackoverflow.com/questions/6884408/how-to-show-sql-query-log-generated-by-a-rspec-test.

And, in postvoterelationships_controller.rb， 我认为：

  @post = Postvoterelationship.find_by(params[:id]).voted

应该：

  @post = Postvoterelationship.find(params[:id]).voted