Rails无法将JSON识别为响应类型

时间:2016-06-09 21:15:54

标签: ruby-on-rails json ajax dart

我正在使用Dart作为客户端代码在我的Rails网站上进行无限滚动。我找到了一个电话的例子,令人惊讶的是,它第一次工作。问题是,如果我点击下一个按钮,它会返回相同的html。我不需要整个页面,只需要滚动数据。我决定尝试使用JSON。该请求由Rails处理,但仍然将其呈现为html。这是我所做的改变:

html请求

HttpRequest.request(url).then(onDataLoaded);

json请求

HttpRequest.request(url, responseType: 'json').then(onDataLoaded);

变量url有一个来自' Next'的网址的副本。按钮:

http://jazzcat.loc/artists?page=2

当我使用此响应处理程序打印到浏览器控制台时:

void onDataLoaded(HttpRequest resp) {
    print(resp.statusText);
    print(resp.responseHeaders);
    print(resp.response);
}

状态文字正常。 响应标头是:

{x-runtime: 0.049101, date: Thu, 09 Jun 2016 23:51:05 GMT, x-content-type-options: nosniff, server: Apache/2.4.18 (Unix) Phusion_Passenger/5.0.24 PHP/5.5.34, x-powered-by: Phusion Passenger 5.0.24, x-frame-options: SAMEORIGIN, content-type: text/html; charset=utf-8, status: 200 OK, cache-control: max-age=0, private, must-revalidate, transfer-encoding: chunked, etag: W/"fb290bd42f831f80ea9359040304ea39", connection: Keep-Alive, keep-alive: timeout=5, max=100, x-xss-protection: 1; mode=block, x-request-id: 9921c6c7-2fb6-43b9-89d3-636fb4a3aec0}

rest.response为空。

我在Chrome浏览器中检查了网络数据,并在响应标签上看到了完整的html数据。 Dart代码必须认为它是json并且无法显示它

这是来自json响应类型请求的Rails应用程序日志:

Started GET "/artists?page=2" for 127.0.0.1 at 2016-06-10 17:05:06 -0700
Processing by ArtistsController#index as */*
Parameters: {"page"=>"2"}
ArtistsController index method
Rendered artists/_list_subnav.html.erb (0.2ms)
Artist Load (1.3ms)  SELECT  `artists`.* FROM `artists`  ORDER BY last_name,     first_name LIMIT 25 OFFSET 25
(0.4ms)  SELECT COUNT(*) FROM `artists`
Rendered artists/index.html.erb within layouts/application (22.9ms)
Completed 200 OK in 31ms (Views: 28.6ms | ActiveRecord: 1.7ms)

我有一个index.json.erb,我也尝试将其添加到控制器:

def index
  # Perform any filtering using ransack search
  logger.debug "ArtistsController index method format"
  @q = Artist.search(params[:q])
  # Partition the output using kaminari page
  @artists = @q.result.order('last_name', 'first_name').page(params[:page])
  respond_to do |format|
    format.html
    format.json { render :json => @artists }
  end
end

如何让Rails渲染json?如何在上面的代码中设置格式?

更新

我完全重写了这个问题。

1 个答案:

答案 0 :(得分:3)

花了两天的时间才找到它。您需要为请求添加Accept标头。以下是我解决上述问题的方法:

Map headers = {'Accept': 'application/json'};
HttpRequest.request(url, requestHeaders: headers).then(onDataLoaded);