我有一个记笔记应用程序的RoR后端。我有一个自定义参数，连同数据库对象本身一起发送到我的Rails API。后端在本地可以正常工作，并且我可以访问API中需要的所有自定义参数。但是，当我切换到Heroku的生产模式时-这意味着从Sqlite3切换到PostgresSql-我的控制器出现语法错误。
这是在本地正常工作的方式：
def show
@question = Question.find(params[:id])
star_count = @question.starring_users.length
render( {json: @question, include: [:comments ,:collections, :starring_users], star_count, status: :ok} )
end
这是我推送到Heroku时遇到的错误：
/app/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.4.2/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require': /app/app/controllers/questions_controller.rb:10: syntax error, unexpected ',', expecting => (SyntaxError)
..., :starring_users], star_count, status: :ok} )
... ^
/app/app/controllers/questions_controller.rb:51: syntax error, unexpected end-of-input, expecting end
这是我的Gemfile
source 'https://rubygems.org'
git_source(:github) { |repo| "https://github.com/#{repo}.git" }
ruby '2.6.1'
# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '~> 5.2.3'
# Use sqlite3 as the database for Active Record
# Use Puma as the app server
gem 'puma', '~> 3.11'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
# gem 'jbuilder', '~> 2.5'
# Use Redis adapter to run Action Cable in production
# gem 'redis', '~> 4.0'
# Use ActiveModel has_secure_password
gem 'bcrypt', '~> 3.1.7'
# Use ActiveStorage variant
# gem 'mini_magick', '~> 4.8'
# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development
# Reduces boot times through caching; required in config/boot.rb
gem 'bootsnap', '>= 1.1.0', require: false
# Use Rack CORS for handling Cross-Origin Resource Sharing (CORS), making cross-origin AJAX possible
gem 'rack-cors'
group :test, :production do
# Call 'byebug' anywhere in the code to stop execution and get a debugger console
gem 'pg'
end
group :development do
gem 'listen', '>= 3.0.5', '< 3.2'
gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
gem 'sqlite3'
# Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
gem 'spring'
gem 'spring-watcher-listen', '~> 2.0.0'
end
# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
gem "jwt", "~> 2.1"
和我的Gemfile.lock
GEM
remote: https://rubygems.org/
specs:
actioncable (5.2.3)
actionpack (= 5.2.3)
nio4r (~> 2.0)
websocket-driver (>= 0.6.1)
actionmailer (5.2.3)
actionpack (= 5.2.3)
actionview (= 5.2.3)
activejob (= 5.2.3)
mail (~> 2.5, >= 2.5.4)
rails-dom-testing (~> 2.0)
actionpack (5.2.3)
actionview (= 5.2.3)
activesupport (= 5.2.3)
rack (~> 2.0)
rack-test (>= 0.6.3)
rails-dom-testing (~> 2.0)
rails-html-sanitizer (~> 1.0, >= 1.0.2)
actionview (5.2.3)
activesupport (= 5.2.3)
builder (~> 3.1)
erubi (~> 1.4)
rails-dom-testing (~> 2.0)
rails-html-sanitizer (~> 1.0, >= 1.0.3)
activejob (5.2.3)
activesupport (= 5.2.3)
globalid (>= 0.3.6)
activemodel (5.2.3)
activesupport (= 5.2.3)
activerecord (5.2.3)
activemodel (= 5.2.3)
activesupport (= 5.2.3)
arel (>= 9.0)
activestorage (5.2.3)
actionpack (= 5.2.3)
activerecord (= 5.2.3)
marcel (~> 0.3.1)
activesupport (5.2.3)
concurrent-ruby (~> 1.0, >= 1.0.2)
i18n (>= 0.7, < 2)
minitest (~> 5.1)
tzinfo (~> 1.1)
arel (9.0.0)
bcrypt (3.1.12)
bootsnap (1.4.2)
msgpack (~> 1.0)
builder (3.2.3)
byebug (11.0.1)
concurrent-ruby (1.1.5)
crass (1.0.4)
erubi (1.8.0)
ffi (1.10.0)
globalid (0.4.2)
activesupport (>= 4.2.0)
i18n (1.6.0)
concurrent-ruby (~> 1.0)
jwt (2.1.0)
listen (3.1.5)
rb-fsevent (~> 0.9, >= 0.9.4)
rb-inotify (~> 0.9, >= 0.9.7)
ruby_dep (~> 1.2)
loofah (2.2.3)
crass (~> 1.0.2)
nokogiri (>= 1.5.9)
mail (2.7.1)
mini_mime (>= 0.1.1)
marcel (0.3.3)
mimemagic (~> 0.3.2)
method_source (0.9.2)
mimemagic (0.3.3)
mini_mime (1.0.1)
mini_portile2 (2.4.0)
minitest (5.11.3)
msgpack (1.2.9)
nio4r (2.3.1)
nokogiri (1.10.2)
mini_portile2 (~> 2.4.0)
pg (1.1.4)
puma (3.12.1)
rack (2.0.6)
rack-cors (1.0.3)
rack-test (1.1.0)
rack (>= 1.0, < 3)
rails (5.2.3)
actioncable (= 5.2.3)
actionmailer (= 5.2.3)
actionpack (= 5.2.3)
actionview (= 5.2.3)
activejob (= 5.2.3)
activemodel (= 5.2.3)
activerecord (= 5.2.3)
activestorage (= 5.2.3)
activesupport (= 5.2.3)
bundler (>= 1.3.0)
railties (= 5.2.3)
sprockets-rails (>= 2.0.0)
rails-dom-testing (2.0.3)
activesupport (>= 4.2.0)
nokogiri (>= 1.6)
rails-html-sanitizer (1.0.4)
loofah (~> 2.2, >= 2.2.2)
railties (5.2.3)
actionpack (= 5.2.3)
activesupport (= 5.2.3)
method_source
rake (>= 0.8.7)
thor (>= 0.19.0, < 2.0)
rake (12.3.2)
rb-fsevent (0.10.3)
rb-inotify (0.10.0)
ffi (~> 1.0)
ruby_dep (1.5.0)
spring (2.0.2)
activesupport (>= 4.2)
spring-watcher-listen (2.0.1)
listen (>= 2.7, < 4.0)
spring (>= 1.2, < 3.0)
sprockets (3.7.2)
concurrent-ruby (~> 1.0)
rack (> 1, < 3)
sprockets-rails (3.2.1)
actionpack (>= 4.0)
activesupport (>= 4.0)
sprockets (>= 3.0.0)
sqlite3 (1.4.0)
thor (0.20.3)
thread_safe (0.3.6)
tzinfo (1.2.5)
thread_safe (~> 0.1)
websocket-driver (0.7.0)
websocket-extensions (>= 0.1.0)
websocket-extensions (0.1.3)
PLATFORMS
ruby
DEPENDENCIES
bcrypt (~> 3.1.7)
bootsnap (>= 1.1.0)
byebug
jwt (~> 2.1)
listen (>= 3.0.5, < 3.2)
pg
puma (~> 3.11)
rack-cors
rails (~> 5.2.3)
spring
spring-watcher-listen (~> 2.0.0)
sqlite3
tzinfo-data
RUBY VERSION
ruby 2.6.1p33
BUNDLED WITH
2.0.1
我尝试对该行进行几次不同的重写都无济于事。如果您有任何建议，不胜感激。
答案 0 :(得分：2)
在本地无法正常工作。这与Sqlite vs Postgres无关。那只是红宝石语法错误。
最小复制示例：
{json: @question, star_count}
您不能在键值Hash的中间声明像这样的独立变量。 Hash中的每个项目都需要一个 key 和一个 value 。
也许您想做的事情是这样的：
render({
json: @question,
include: [:comments, :collections, :starring_users],
star_count: star_count,
status: :ok
})
...但是无论您要做什么，关键是这纯粹是语法错误。与数据库引擎无关，我保证代码也不会在本地运行。