Question

我有很多表，我每周都将所有字段设置为零，除了一些选择的字段（包括外键和一些时间值）。目前，我正在使用update_all（field：value，...）命令，它可以正常工作。唯一的问题是我必须列出我要清除的每个字段，而且我经常忘记在更改表时添加字段，这会导致错误。

有没有办法让rails清除表中的所有字段，除了指定的几个字段？

谢谢！

Answer 1

在Rails中，每个模型都有方法<div class="column"> <div class="flex-container"> <div class="flex-item"> L1 </div> <div class="flex-item"> L2 </div> <div class="flex-item"> L3 </div> <div class="flex-item"> L4 </div> <div class="flex-item"> L5 </div> <div class="flex-item"> L6 </div> </div> </div>，它返回列的列表。你可以为每个模型做这样的事情：

tell application "Finder"
    close every window
    activate
    open trash
    select every item of trash
    delay 1
end tell
tell application "System Events"
    key code 51 using (command down)
    delay 1
    try
        set theCheckbox to checkbox "Apply to All" of scroll area 1 of window "Copy" of application process "Finder"
        set applyToAll to perform action "AXPress" of checkbox "Apply to All" of scroll area 1 of window "Copy" of application process "Finder"
        set replaceButton to perform action "AXPress" of button "Replace" of scroll area 1 of window "Copy" of application process "Finder"
        if theCheckbox exists then
            delay 1
            applyToAll
            delay 1
            replaceButton
        else
            key code 51 using (command down)
        end if
    end try
end tell

Rails Postgres：将表中的所有字段设置为零，除了

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