Ruby中'更新'的NoMethodError

Question

我一直在麻煩一會兒讓這個put方法工作。

我收到以下錯誤消息的「成功」行！

NoMethodError - 未定義的方法'更新」對於零：NilClass

請參閱下面的代碼：

#edit download 
put '/view1/downloadedit' do 
    data = JSON.parse(request.body.read) 
    edit_id = data[0]["downloadID"] 
    @download_edit = Download.get(:download_id => edit_id) 
    puts @download_edit 
    success = @download_edit.update![0][data] 
    if success 
    status 201 
    puts 'edit saved okay' 
    else 
    status 201 
    puts 'edit failed to SAVE' 
    end 

end 

Download.rb

#class download 
class Download 
    include DataMapper::Resource 
    property :downloadID, Serial, key: true 
    property :PageID, String 
    property :title, String 
    property :dlLink, String 
    property :imgSrc, String 
    property :caption, String 
    property :dlLive, Integer 
    property :createdAt, DateTime 
    property :user_id, Integer 
end 

Answer 1

您需要修改你如何獲取你的模型和你如何更新，所以變化你的代碼如下：

put '/view1/downloadedit' do 
    data = JSON.parse(request.body.read) 
    edit_id = data[0]["downloadID"] 
    @download_edit = Download.get(edit_id) 
    puts @download_edit 
    success = @download_edit.update(
    attribute1: data[0][attribute1] 
    attribute2: data[0][attribute2] 
    # and so on for all the other attributes... 
) 
    if success 
    status 201 
    puts 'edit saved okay' 
    else 
    status 201 
    puts 'edit failed to SAVE' 
    end 

end