Rails Rails 5 如何自定义处理 ActionDispatch::ParamsParser::ParseError 异常
参考这个方式处理 https://robots.thoughtbot.com/catching-json-parse-errors-with-custom-middleware ，提示“No such middleware to insert before: ActionDispatch::ParamsParser”。
运行 rake middleware 结果如下：（确实没有 ActionDispatch::ParamsParser）
use Rack::Sendfile
use ActionDispatch::Static
use ActionDispatch::Executor
use ActiveSupport::Cache::Strategy::LocalCache::Middleware
use Rack::Runtime
use Rack::MethodOverride
use ActionDispatch::RequestId
use Sprockets::Rails::QuietAssets
use Rails::Rack::Logger
use ActionDispatch::ShowExceptions
use WebConsole::Middleware
use ActionDispatch::DebugExceptions
use ActionDispatch::RemoteIp
use ActionDispatch::Reloader
use ActionDispatch::Callbacks
use ActionDispatch::Cookies
use ActionDispatch::Session::CookieStore
use ActionDispatch::Flash
use Rack::Head
use Rack::ConditionalGet
use Rack::ETag
run RailsChecheDataaudit::Application.routes
改为
config.middleware.insert_before ActionDispatch::Static, 'CatchJsonParseErrors'
仍然无法捕获异常。应该如何处理？
# insert middleware wherever you want in the stack, optionally pass initialization arguments
config.middleware.insert_before ActionDispatch::ParamsParser, Rack::Robustness do |c|
c.no_catch_all
c.on(ArgumentError) { |ex| 400 }
c.content_type 'application/json'
c.body{ |ex|
{
error: ex.message
}.to_json
}
c.ensure(true) { |ex| env['rack.errors'].write(ex.message) }
end if Rails.env.production? # 生产环境
@charleszhang 试试呗。
# in app/middleware/catch_json_parse_errors.rb
class CatchJsonParseErrors
def initialize(app)
@app = app
end
def call(env)
begin
@app.call(env)
rescue ActionDispatch::Http::Parameters::ParseError => e
if env['HTTP_ACCEPT'] =~ /application\/json/
error_output = "There was a problem in the JSON you submitted: #{e.message}"
return [
400, { "Content-Type" => "application/json" },
[ { status: 400, error: error_output }.to_json ]
]
else
raise error
end
end
end
end
# in config/application.rb
module YourApp
class Application < Rails::Application
# ...
config.middleware.insert_after ActionDispatch::ShowExceptions, 'CatchJsonParseErrors'
# ...
end
end