如何解决以下错误 - 发送摘要时出错(true：TrueClass 的未定义方法"length")

Question

我一直在尝试从以下链接配置插件 - https://www.redmine.org/plugins/digest

当我尝试发送测试邮件时，出现以下错误。true：TrueClass 的未定义方法"length"

这是日志文件中的错误

Looking up projects to process...
Couldn't find all EnabledModules with 'id': (all, {:conditions=>["name = 'redmine_digest'"]}) (found 0 results, but was looking for 2)
undefined method `length' for true:TrueClass
["/home/administrator/redmine3.1/apps/redmine/htdocs/plugins/redmine_digest/app/controllers/digest_controller.rb:84:in `digest_send'", "/home/administrator/redmine3.1/apps/redmine/htdocs/plugins/redmine_digest/app/controllers/digest_controller.rb:129:in `test_email'", "/home/administrator/redmine3.1/apps/redmine/htdocs/vendor/bundle/ruby/2.0.0/gems/actionpack-4.2.4/lib/action_controller/metal/implicit_render.rb:4:in `send_action'", 

digest_controller.rb 文件如果 Rails：：VERSION：：MAJOR <3 需要"rdoc/markup/simple_markup" 需要"rdoc/markup/simple_markup/to_html"还 需要"rdoc"结束

类摘要控制器

layout 'admin'
def show_readme
    filename = 'README.rdoc'
    f = File.dirname(__FILE__) + '/../../' + filename
    input_string = File.open(f, 'rb').read
    if Rails::VERSION::MAJOR >=3
        h = RDoc::Markup::ToHtml.new
        instructions = h.convert(input_string)
    else
        p = SM::SimpleMarkup.new
        h = SM::ToHtml.new
        instructions = p.convert(input_string, h)
    end
    @readme = { 
        :filename => filename, 
        :content => instructions 
    }
    respond_to do |format|
        format.html { render :template => 'settings/digest_readme.html.erb', :layout => 'admin',
        :locals => { :readme => @readme }}
    end
end
def digest_send(which, options={})
    is_session = @request.nil? && @_request.nil?
    is_session = !is_session
    if not is_session
        puts "setting request"
        @_request = ActionDispatch::Request.new(Rails.env)
    end
    if is_session
    raise_delivery_errors = ActionMailer::Base.raise_delivery_errors
    # Force ActionMailer to raise delivery errors so we can catch it
    ActionMailer::Base.raise_delivery_errors = true
    end
    begin
        case which
        when "options"
            @test = DigestMailer.digests(options)
            message = l(:notice_digests_sent)
        when "test"
            dbg "User.current: %s" % User.current
            dbg "User.current.mail: %s" % User.current.mail
            @test = DigestMailer.test(User.current)
            message = l(:notice_digest_sent_to, User.current.mail)
        when "all"
            @test = DigestMailer.digests
            message = l(:notice_digests_sent)
        else
            message "No case found for '%s'." % which
        end
        if @test.nil? #or @test.empty?
            message += "<p>%s</p>" % "There was no resulting email."
        else
            message += "<p>%d %s processed.<br />%s</p>" % [
                @test.length, 
                @test.length == 1 ? "project was" : "projects were",
                @test.join("<br />")
            ]
        end
        dbg message
        if is_session
            flash[:notice] = message
        end
    rescue Exception => e
        dbg e.message
        dbg e.backtrace
        if Rails::VERSION::MAJOR >= 3
            logger.error("%s: " % e.message) unless logger.nil?
        else
            logger.error e.message, e.backtrace unless logger.nil?
        end
        flash[:error] = l(:notice_digest_error, e.message) unless session.nil?
        if is_session
            flash[:error] = l(:notice_digest_error, e.message)
        else
            puts "Exception occurred: %s" % e.message
        end
    end
    if is_session
        ActionMailer::Base.raise_delivery_errors = raise_delivery_errors
        redirect_to :controller => 'settings', :action => 'plugin', :id => 'redmine_digest'
    else
        puts "A session was not found."
    end
end
def send_digest(options={})
    dbg "Preparing to send digest..."
    dbg options.inspect
    digest_send("options", options)
end
def send_all
    dbg "Preparing to send digest for all projects."
    digest_send "all"
end
def test_email
    dbg "Preparing to send test digest."
    digest_send "test"
end
def dbg(message)
    if Setting.plugin_redmine_digest[:debugging_messages]
        puts message
        logger.info(message)
    else
        puts "debugging_messages: %s" % Setting.plugin_redmine_digest[:debugging_messages]
        logger.info("debugging_messages: %s" % Setting.plugin_redmine_digest[:debugging_messages])
    end
end
def self.logger
    if Rails::VERSION::MAJOR >= 3
        logger = Rails.logger
    else
        logger = RAILS_DEFAULT_LOGGER
    end
    return logger unless logger.nil?
    #ActionController::Base::logger
end

结束

Answer 1

检查@test.nil?是不够的;你还需要检查它的类型。您可以通过在@test上调用to_s方法将其转换为String对象，或者您可以检查它的类，它是否是字符串或不如下所示：

if !@test.nil? && @test.is_a? String
  # do your stuff
else
end