我一直在努力完成本书，但是“编写ActiveRecord规范＆＃39;需要更改Rails 4强参数要求。
我添加了一个location_controller.rb来克服强参数错误
应用程序/控制器/ location_controller.rb
class LocationController < ActionController::Base
params = ActionController::Parameters.new(latitude: lat, longitude: long)
end
应用程序/模型/ location.rb
require 'active_record'
class Location < ActiveRecord::Base
#attr_protected :latitude, :longitude
validates :latitude, :longitude,:presence => true,:numericality => true
R = 3_959 # Earth's radius in miles, approx
def near?(lat, long, mile_radius)
raise ArgumentError unless mile_radius >= 0
#loc = Location.new(:latitude => lat,:longitude => long)
loc = location.new(params)
R * haversine_distance(loc) <= mile_radius
end
private
def to_radians(degrees)
degrees * Math::PI / 180
end
def haversine_distance(loc)
dist_lat = to_radians(loc.latitude - self.latitude)
dist_long = to_radians(loc.longitude - self.longitude)
lat1 = to_radians(self.latitude)
lat2 = to_radians(loc.latitude)
a = Math.sin(dist_lat/2) * Math.sin(dist_lat/2) +
Math.sin(dist_long/2) * Math.sin(dist_long/2) *
Math.cos(lat1) * Math.cos(lat2)
2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a))
end
end
规格/模型/ location_spec.rb
require "spec_helper"
require "rspec/its"
require "/home/conor/geo_pictures/app/models/location"
describe Location do
let (:latitude) { 38.911268 }
let (:longitude) { -77.444243 }
let (:air_space) { Location.new(:latitude => 38.911268, :longitude => -77.444243) }
describe "#initialize" do
subject { air_space }
its(:latitude) { should == latitude }
its(:longitude) { should == longitude }
end
describe "#near?" do
context "when within the specified radius" do
subject { air_space }
it { should be_near(latitude, longitude, 1) }
end
context "when outside the specified radius" do
subject { air_space }
it { should_not be_near(latitude * 10, longitude * 10, 1) }
end
end
context "when a negative radius is used" do
it "raising an error" do
expect { air_space.near?(latitude, longitude, -1) }.to raise_error ArgumentError
end
end
end
的Gemfile
source 'https://rubygems.org'
# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '4.0.3'
# Use sqlite3 as the database for Active Record
gem 'sqlite3'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 4.0.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# Use CoffeeScript for .js.coffee assets and views
gem 'coffee-rails', '~> 4.0.0'
# See https://github.com/sstephenson/execjs#readme for more supported runtimes
# gem 'therubyracer', platforms: :ruby
# Use jquery as the JavaScript library
gem 'jquery-rails'
# Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
gem 'turbolinks'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 1.2'
group :doc do
# bundle exec rake doc:rails generates the API under doc/api.
gem 'sdoc', require: false
end
gem 'rspec-rails', :group => [:test, :development]
gem 'rspec-its', :group => [:test, :development]
# Use ActiveModel has_secure_password
# gem 'bcrypt-ruby', '~> 3.1.2'
# Use unicorn as the app server
# gem 'unicorn'
# Use Capistrano for deployment
# gem 'capistrano', group: :development
# Use debugger
# gem 'debugger', group: [:development, :test]
我收到的错误消息是
故障：
1）位置＃初始化纬度
失败/错误：let（：air_space）{Location.new（：latitude =＆gt; 38.911268，：longitude =＆gt; -77.444243）}
ActiveRecord的:: ConnectionNotEstablished：
的ActiveRecord :: ConnectionNotEstablished
＃./spec/models/location_spec.rb:11:in block (2 levels) in <top (required)>'
# ./spec/models/location_spec.rb:15:in阻止（3级）＆＃39;
＃./spec/models/location_spec.rb:17:in块中的“块（3级）”
2）位置#initize经度
失败/错误：let（：air_space）{Location.new（：latitude =＆gt; 38.911268，：longitude =＆gt; -77.444243）}
ActiveRecord的:: ConnectionNotEstablished：
的ActiveRecord :: ConnectionNotEstablished
＃./spec/models/location_spec.rb:11:in block (2 levels) in <top (required)>'
# ./spec/models/location_spec.rb:15:in阻止（3级）＆＃39;
＃./spec/models/location_spec.rb:19:in块中的“块（3级）”
3）位置＃附近？在指定半径范围内
失败/错误：let（：air_space）{Location.new（：latitude =＆gt; 38.911268，：longitude =＆gt; -77.444243）}
ActiveRecord的:: ConnectionNotEstablished：
的ActiveRecord :: ConnectionNotEstablished
＃./spec/models/location_spec.rb:11:in block (2 levels) in <top (required)>'
# ./spec/models/location_spec.rb:25:in阻止（4级）＆＃39;
＃./spec/models/location_spec.rb:26:in块中的“块（4级）”
4）位置＃附近？在指定半径之外时
失败/错误：let（：air_space）{Location.new（：latitude =＆gt; 38.911268，：longitude =＆gt; -77.444243）}
ActiveRecord的:: ConnectionNotEstablished：
的ActiveRecord :: ConnectionNotEstablished
＃./spec/models/location_spec.rb:11:in block (2 levels) in <top (required)>'
# ./spec/models/location_spec.rb:29:in阻止（4级）＆＃39;
＃./spec/models/location_spec.rb:30：在＆＃39;
5）使用负半径引发错误时的位置
失败/错误：期望{air_space.near？（纬度，经度，-1）}。到raise_error ArgumentError
预期的ArgumentError，得到#with backtrace：
＃./spec/models/location_spec.rb:11:in block (2 levels) in <top (required)>'
# ./spec/models/location_spec.rb:39:in阻止（4级）＆＃39;
＃./spec/models/location_spec.rb:39:in block (3 levels) in <top (required)>'
# ./spec/models/location_spec.rb:39:in阻止（3级）＆＃39;
以0.01039秒结束（文件加载0.80876秒） 5个例子，5个失败
失败的例子：
rspec ./spec/models/location_spec.rb:17#位置#initialize latitude rspec ./spec/models/location_spec.rb:19#位置#initialize经度 rspec ./spec/models/location_spec.rb:26＃位置＃附近？在指定半径范围内 rspec ./spec/models/location_spec.rb:30#位置＃附近？在指定半径之外时 rspec ./spec/models/location_spec.rb:37＃使用负半径引发错误时的位置
将此添加到spec / spec_helper.rb
ActiveRecord::Base.establish_connection(:adapter => "sqlite3",
:database => ":memory:")
将错误更改为
/home/conor/geo_pictures/spec/spec_helper.rb：1：在`＆＃39;：未初始化的常量ActiveRecord（NameError）
答案 0 :(得分：1)
您应该修复的第一个错误是：ActiveRecord::ConnectionNotEstablished。您需要在config/database.yml中配置测试数据库。
在您的规范（spec/models/location_spec.rb）中，您只需拥有require 'spec_helper'。其他类将由Rails自动加载。
最后，通常不会以该格式指定强参数。
您可以像这样指定它们：
params.require(:location).permit(:latitude, :longititude)