jquery - jQuery ajax post 时出现 SystemStackError(堆栈级别太深)

Question

我有一个表单，当用户在文本字段中输入某些值时，我想自动填充其他字段，但它不断返回 SystemStackError (堆栈级别太深)。这是文件:

路线.rb

scope :places, controller: :places, as: :places do
    post :postcode, action: :postcode, as: :postcode
end

form.html.erb

<form>
    <input type="text" class="input_postcode">
    <input type="text" class="input_state">
</form>

main.js

$(document).on('change', ".input_postcode", function(e) {
    e.stopPropagation();
    e.preventDefault();
    var postcode = $(this).val();
    $.post( 'places/postcode', { postcode: postcode }, function(data) {
        $(".input_state").val(data.state);
        return false;
    }, 'json');
    return false;
});

places_controller.rb

def postcode
    place = Place.where(postcode: postcode).first
    state = place.state.name
    respond_to do |format|
        format.js { render json: { state: state } }
    end
end

我在控制台中得到这个结果:

SystemStackError (stack level too deep):
    app/controllers/places_controller.rb:4:in `postcode'
    app/controllers/places_controller.rb:4:in `postcode'
    app/controllers/places_controller.rb:4:in `postcode'
    app/controllers/places_controller.rb:4:in `postcode'
    app/controllers/places_controller.rb:4:in `postcode'
    app/controllers/places_controller.rb:4:in `postcode'
    app/controllers/places_controller.rb:4:in `postcode'
    app/controllers/places_controller.rb:4:in `postcode'
    app/controllers/places_controller.rb:4:in `postcode'
    app/controllers/places_controller.rb:4:in `postcode'
    app/controllers/places_controller.rb:4:in `postcode'
    app/controllers/places_controller.rb:4:in `postcode'
    (keeps going the infinite loop...)

places_controller 中的第 4 行是 place = Place.where(postcode: postcode).first 行。

我不知道我做错了什么。希望有人能帮助我!

Answer 1

您收到SystemStackError(堆栈级别太深)，因为您的操作名称是postcode，并且您的对象变量名称/方法也被命名为postcode >.

  place = Place.where(postcode: postcode).first

当您传入 postcode 属性时会发生错误，因为它与方法/操作具有相同的名称。

要修复错误，请重命名操作和路由名称。