我正在编辑一个资源-@article，每当我提交它时，我都会收到以下错误：
JSON::ParserError in ArticlesController#update
783: unexpected token at '#<ImageUploader::UploadedFile:0x00007fb154adb508>'
它强调了这一行：
if @article.update(article_params)
这是我的Article#Update操作中的普通Rails样板代码：
def update
respond_to do |format|
if @article.update(article_params)
format.html { redirect_to @article, notice: 'Article was successfully updated.' }
format.json { render :show, status: :ok, location: @article }
else
format.html { render :edit }
format.json { render json: @article.errors, status: :unprocessable_entity }
end
end
end
以下是服务器日志(包括params(的完整输出：
Started PATCH "/articles/welcome-to-ftja" for ::1 at 2020-05-04 02:11:43 -0500
Processing by ArticlesController#update as HTML
Parameters: {"authenticity_token"=>"0pO56DaVEiWLX3iE3HNHRKsAPOK2z4RmUaH3jal5rOZjk7zYeoaSru9xOE9GYzLckTbnrVrz4ihXrc1hWcXzXA==", "article"=>{"title"=>"Welcome to FTJA!!", "featured"=>"true", "image"=>"#<ImageUploader::UploadedFile:0x00007fb154adb508>", "body"=>"<h1>Yet another great article.</h1><div>Test <strong>bold</strong> <em>italic</em> <del>strikethrough<br><br></del><figure data-trix-attachment="{"content":"<figure class=\"attachment attachment--preview attachment--jpg\">\n <img src=\"http://localhost:3000/rails/active_storage/representations/eyJfcJ2YXJpYXRpb24ifX0=--5b3d481c22cafd1ff8db36c1b24e57d8788d2217/cowork-4.jpg\" />\n\n <figcaption class=\"attachment__caption\">\n Coworking.\n </figcaption>\n</figure>\n","contentType":"image/jpeg","filename":"cowork-4.jpg","filesize":82497,"height":768,"previewable":true,"sgid":"_ZXhwaXJlc19pbgY7AFRJIgxwdXJwb3NlBjsAVEkiD2F0dGFjaGFibGUGOwBUSSIPZXhwaXJlc19hdAY7AFQw--e56d2e422","url":"http://localhost:3000/rails/active_storage/blobs/eyJfcmFpbHMiOnsibWVzc2FnZSI6IkJBaHBEUT09IiwiZXhwIjpudWxsLCJwdXIiOiJibG9iX2lkIn19--6d89ec207ef10c8e48577a5e9a170a8d178a9338/cowork-4.jpg","width":752}" data-trix-content-type="image/jpeg" data-trix-attributes="{"caption":"Coworking.","presentation":"gallery"}" class="attachment attachment--content attachment--jpg"><figure class="attachment attachment--preview attachment--jpg">rn <img src="http://localhost:3000/rails/active_storage/blobs/eyJfcmFpbHMiOnsibWVzc2FnZSI6IkJBaHBEUT09IiwiZXhwIjpudWxsLCJwdXIiOiJibG9iX2lkIn19--6d89ec207ef10c8e48577a5e9a170a8d178a9338/cowork-4.jpg" width="752" height="768">rnrn <figcaption class="attachment__caption">rn Coworking.rn </figcaption>rn</figure>rn<figcaption class="attachment__caption attachment__caption--edited">Coworking.</figcaption></figure><br><br><br><figure data-trix-attachment="{"content":"<figure class=\"attachment attachment--preview attachment--jpg\">\n <img src=\"http://localhost:3000/rails/active_storage/representations/eyJfcmFpbHMiOnsibWVzc2F-5b3d481c22cafd1ff8db36c1b24e57d8788d2217/article-1.jpg\" />\n\n <figcaption class=\"attachment__caption\">\n Working, working, working.\n </figcaption>\n</figure>\n","contentType":"image/jpeg","filename":"article-1.jpg","filesize":83730,"height":800,"previewable":true,"sgid":"BAh7CEkiCGdpZAY6BkVU--d99eadb00dd5ae6bb4220f5781b2946c2171604f","url":"http://localhost:3000/rails/active_storage/blobs/eyJfcmFpbHMiOnsibWVzc2FnZSI6IkJBaHBEZz09IiwiZXhwIjpudWxsLCJwdXIiOiJibG9iX2lkIn19--5c31ee2db4a2660d4a674dfb54375fda30251d3d/article-1.jpg","width":1200}" data-trix-content-type="image/jpeg" data-trix-attributes="{"caption":"Working, working, working.","presentation":"gallery"}" class="attachment attachment--content attachment--jpg"><figure class="attachment attachment--preview attachment--jpg">rn <img src="http://localhost:3000/rails/active_storage/representations/eyJfcmFpbHMiOnsibWVzc2FnZSI6IkJBaHBEZz09IiwiZXhwIjpudWxsLCJwdXIiOiJibG9i6IkJBaDdCam9VY21WemFYcGxYM1J2WDJ4cGJXbDBXd2RwQWdBRWFRSUFBdz09IiwiZXhwIjpudWxsLCJwdXIiOiJ2YXJpYXRpb24ifX0=--5b3d481c22cafd1ff8db36c1b24e57d8788d2217/article-1.jpg">rnrn <figcaption class="attachment__caption">rn Working, working, working.rn </figcaption>rn</figure>rn<figcaption class="attachment__caption attachment__caption--edited">Working, working, working.</figcaption></figure><br><br><br></div>", "user_id"=>"1", "category_list"=>["", "Business", "Real Estate"]}, "commit"=>"Update Article", "id"=>"welcome-to-ftja"}
Article Load (2.1ms) SELECT "articles".* FROM "articles" WHERE "articles"."slug" = $1 LIMIT $2 [["slug", "welcome-to-ftja"], ["LIMIT", 1]]
↳ app/controllers/articles_controller.rb:73:in `set_article'
(2.1ms) BEGIN
↳ app/controllers/articles_controller.rb:50:in `block in update'
ActionText::RichText Load (4.0ms) SELECT "action_text_rich_texts".* FROM "action_text_rich_texts" WHERE "action_text_rich_texts"."record_id" = $1 AND "action_text_rich_texts"."record_type" = $2 AND "action_text_rich_texts"."name" = $3 LIMIT $4 [["record_id", 1], ["record_type", "Article"], ["name", "body"], ["LIMIT", 1]]
↳ app/controllers/articles_controller.rb:50:in `block in update'
(1.3ms) ROLLBACK
↳ app/controllers/articles_controller.rb:50:in `block in update'
Completed 500 Internal Server Error in 27ms (ActiveRecord: 9.4ms | Allocations: 5092)
JSON::ParserError (783: unexpected token at '#<ImageUploader::UploadedFile:0x00007fb154adb508>'):
app/controllers/articles_controller.rb:50:in `block in update'
app/controllers/articles_controller.rb:49:in `update'
如果你注意到参数中的category_list，我相信这可能是导致它的原因：
"category_list"=>["", "Business", "Real Estate"]},
根据我在谷歌上做的一些搜索，可能是空字符串""为循环抛出了一些JSON解析。
我发现的一个建议是将Cookie序列化程序更改为:hybrid，如下所示：
Rails.application.config.action_dispatch.cookies_serializer = :hybrid
我试过了，重新启动了服务器，但没有成功。
是什么原因导致了这种情况，我该如何解决？
编辑1
在错误页面的控制台上，我也尝试了以下操作：
>> article_params[:category_list]
=> ["", "Business", "Real Estate"]
>> article_params[:category_list].to_json
=> "["","Business","Real Estate"]"
>> @article.image
=> #<ImageUploader::UploadedFile storage=:store id="3b96dc3198098a9f57ff2b00a2cdb252.jpg" metadata={"filename"=>"article-3.jpg", "size"=>99083, "mime_type"=>"image/jpeg"}>
编辑2
我使用SimpleForm来处理我的表单，这个特定表单的截断版本如下所示：
<%= simple_form_for article, html: {multipart: true} do |f| %>
<%= f.input_field :title, placeholder: "Title", class: "form-control" %>
<%= f.rich_text_area :body, class: 'form-control customized-min-height', placeholder: "Enter your article body here..." %>
<%= f.input :user_id, as: :hidden, input_html: { value: current_user.id } %>
<%= f.input_field :category_list, collection: ActsAsTaggableOn::Tag.all.pluck(:name), input_html: { value: article.category_list.join(","), class: "custom-control-input" }, as: :check_boxes %>
<%= f.button :submit, class:"btn btn-primary" %>
<% end %>
当我转到Articles#Edit时，上面的表格只生成""
这是我的Articles#Edit控制器操作：
# GET /articles/1/edit
def edit
end
我该如何解决这个问题？
编辑3
好的，通过添加include_blank: false和include_hidden: false，我最终得到了不返回空字符串的表单，如下所示：
<%= f.input_field :category_list, collection: ActsAsTaggableOn::Tag.all.pluck(:name), input_html: { value: article.category_list.join(","), class: "custom-control-input" }, as: :check_boxes, include_blank: false, include_hidden: false %>
它生成的参数看起来像这样：
>> article_params
=> <ActionController::Parameters {"title"=>"Welcome!!", "body"=>"<h1>Yet another great article.</h1><div>Test <strong>bold</strong> <em>italic</em> <del>strikethrough<br><br></del><figure data-trix-attachment="{"content":"<figure class=\"attachment attachment--preview attachment--jpg\">\n <img src=\"http://localhost:3000/rails/active_storage/representations/eyJfcmFpbHMiOnsibWVzc2FnZSI6IkJBaHBd2217/cowork-4.jpg\" />\n\n <figcaption class=\"attachment__caption\">\n Coworking.\n </figcaption>\n</figure>\n","contentType":"image/jpeg","filename":"cowork-4.jpg","filesize":82497,"height":768,"previewable":true,"sgid":"BAhaac","url":"http://localhost:3000/rails/active_storage/blobs/eya9338/cowork-4.jpg","width":752}" data-trix-content-type="image/jpeg" data-trix-attributes="{"caption":"Coworking.","presentation":"gallery"}" class="attachment attachment--content attachment--jpg"><figure class="attachment attachment--preview attachment--jpg">rn <img src="http://localhost:3000/rails/active_storage/representations/e88d2217/cowork-4.jpg">rnrn <figcaption class="attachment__caption">rn Coworking.rn </figcaption>rn</figure>rn<figcaption class="attachment__caption attachment__caption--edited">Coworking.</figcaption></figure><br><br><br><figure data-trix-attachment="{"content":"<figure class=\"attachment attachment--preview attachment--jpg\">\n <img src=\"http://localhost:3000/rails/active_storage/representations/eyJ8d2217/article-1.jpg\" />\n\n <figcaption class=\"attachment__caption\">\n Working, working, working.\n </figcaption>\n</figure>\n","contentType":"image/jpeg","filename":"article-1.jpg","filesize":83730,"height":800,"previewable":true,"sgid":"B1604f","url":"http://localhost:3000/rails/active_storage/blobs/eyd3d/article-1.jpg","width":1200}" data-trix-content-type="image/jpeg" data-trix-attributes="{"caption":"Working, working, working.","presentation":"gallery"}" class="attachment attachment--content attachment--jpg"><figure class="attachment attachment--preview attachment--jpg">rn <img src="http://localhost:3000/rails/active_storage/blobs/eyd3d/article-1.jpg" width="1200" height="800">rnrn <figcaption class="attachment__caption">rn Working, working, working.rn </figcaption>rn</figure>rn<figcaption class="attachment__caption attachment__caption--edited">Working, working, working.</figcaption></figure><br><br><br></div>", "featured"=>"true", "user_id"=>"1", "image"=>"#<ImageUploader::UploadedFile:0x00007fd18d61b1e0>", "category_list"=>["Business", "Real Estate", "Investing"]} permitted: true>
但我还是犯了同样的错误。看来还有另一个罪魁祸首。
经过大量的研究和无限的尝试和错误之后，我偶然发现了修复方法。
基本上，只要表单当前有一个图像并且正在编辑，就会发生这种情况，如果现有图像处理不当，就会将cached_image数据转换为字符串。你可以在这里看到更好的解释。
罪魁祸首原来是我表格中的这行：
<%= f.input :image, as: :hidden, value: f.object.cached_image_data %>
一旦我把它改成下面的样子，它就像一个符咒：
<%= f.input :image, as: :hidden, input_html: { value: f.object.cached_image_data } %>
查看错误消息
783: unexpected token at '#<ImageUploader::UploadedFile:0x00007fb154adb508>'
它似乎永远不会到达空字符串(即使这也可能给您带来错误(。它在解析ImageUploader参数时遇到问题。
从其他人那里读到这个错误，似乎这可能与插件有关？并且该数据的解析和转换失败。
据我所知，你在基于simple_form的表单的富文本字段中添加了一个左右的图像。当它试图将图像转换为json时，它失败了。
所以我建议你看看关于图片上传的任何宝石吧？我在Simple_form github上找不到任何类似的问题，所以我认为上传程序部分不在Simple_form本身中。但通过问题获得Simple_form开发人员的帮助可能是解决这个问题的好方法。