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具有json数组的强参数

strong-parameters ruby-on-rails

anquegi · 技术社区 · 8 年前

我已经准备好读这个答案了 how to permit an array with strong parameters

如何提取注释参数?

(byebug) params
{"comments"=>"[{\"comment\":\"ndjsnjakldnfljkasdbfhjae\",\"date\":\"2017-07-20 17:14:38\"}]", "format"=>:json, "controller"=>"airis/observations", "action"=>"create", "id"=>"13534543543"}
(byebug) params.permit(:id)
[2017-07-20 19:14:43 +0200] [f2b3d7c8-c84a-43a5-b48f-0f634be49dc7] Unpermitted parameters: comments, format
{"id"=>"13534543543"}
(byebug) params.permit(:comments)
[2017-07-20 19:14:43 +0200] [f2b3d7c8-c84a-43a5-b48f-0f634be49dc7] Unpermitted parameters: format, id
{"comments"=>"[{\"comment\":\"ndjsnjakldnfljkasdbfhjae\",\"date\":\"2017-07-20 17:14:38\"}]"}
(byebug) params.permit(comments: [:comment, :date])
[2017-07-20 19:14:43 +0200] [f2b3d7c8-c84a-43a5-b48f-0f634be49dc7] Unpermitted parameters: format, id
{"comments"=>nil}
(byebug) params.permit(:id, comments: [:comment, :date])
[2017-07-20 19:14:43 +0200] [f2b3d7c8-c84a-43a5-b48f-0f634be49dc7] Unpermitted parameter: format
{"id"=>"13534543543", "comments"=>nil}

(byebug) params.permit( :comments => [:comment, :date])
[2017-07-20 19:14:43 +0200] [f2b3d7c8-c84a-43a5-b48f-0f634be49dc7] Unpermitted parameters: format, id
{"comments"=>nil}

1 回复 | 直到 8 年前

jvillian 8 年前

尝试一下:

2.3.1 :034 > JSON.parse(params.permit(:comments)[:comments])
Unpermitted parameters: format, id
 => [{"comment"=>"ndjsnjakldnfljkasdbfhjae", "date"=>"2017-07-20 17:14:38"}]

params.permit(:comments) 返回仅包含“comments”k,v对的params散列(删除不允许的参数, format 和 id

2.3.1 :035 > params.permit(:comments)
Unpermitted parameters: format, id
 => {"comments"=>"[{\"comment\":\"ndjsnjakldnfljkasdbfhjae\",\"date\":\"2017-07-20 17:14:38\"}]"}

params.permit(:comments)[:comments] 选择 :comments

2.3.1 :036 > params.permit(:comments)[:comments]
Unpermitted parameters: format, id
 => "[{\"comment\":\"ndjsnjakldnfljkasdbfhjae\",\"date\":\"2017-07-20 17:14:38\"}]"

JSON.parse(params.permit(:comments)[:comments]) 将字符串转换为正确的ruby数组。

array 对象

如果你两者都想要 :注释 和 :id

params.permit(:comments, :id)
Unpermitted parameter: format
 => {"comments"=>"[{\"comment\":\"ndjsnjakldnfljkasdbfhjae\",\"date\":\"2017-07-20 17:14:38\"}]", "id"=>"13534543543"}

2.3.1 :038 > params.permit(:comments, :id)[:comments]
Unpermitted parameter: format
 => "[{\"comment\":\"ndjsnjakldnfljkasdbfhjae\",\"date\":\"2017-07-20 17:14:38\"}]"

以及:

2.3.1 :039 > params.permit(:comments, :id)[:id]
Unpermitted parameter: format
 => "13534543543"

你可能想把它包装成这样:

def clean_params
  @clean_params ||= params.permit(:comments, :id)
end

所以你可以做 clean_params[:comments] 和 clean_params[:id]