小编Ale*_*ack的帖子

如何检查Ubuntu Server上的rails环境？

命令:Rails.env => command not found 命令: rails.env => command not found

在项目中我有这个表:

1. 产品(id,catalogId,manufacturerId ......)
2. 目录
3. 生产厂家

还有Product型号(id, name, catalogId, catalogTitle, manufacturerId, manufacturerName).

如果我想获得Product项,如何在Linq中写下这个SQL查询？

SELECT Product.Name, Product.CatalogId, Product.ManufacturerId, [Catalog].Name, Manufacturer.Name
FROM Product, [Catalog], Manufacturer
WHERE [Catalog].Id=Product.CatalogId AND Manufacturer.id=Product.ManufacturerId AND Product.Active=1

我有3个MySQL表(food,apple,和orange).

我想删除以下行:

apple(idapple, iduser, name) 
orange(idornge, iduser, name)

food(iduser, name)使用一个触发器删除行时？

到目前为止,这是我的触发器:

  CREATE TRIGGER `food_before_delete`

    AFTER DELETE ON `food` 
    FOR EACH ROW 

      DELETE FROM apple, orange 
      WHERE 
      apple.iduser=OLD.iduser and 
      orange.iduser=OLD.iduser

但它不会编译.如何制作一次从两个表中删除的触发器？

我无法设置RatingBar的评级.我的代码如下.如何为动态添加的RatingBar设置默认评级？
这是我的代码.

public class DialogRate extends Activity implements OnRatingBarChangeListener {
...
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.dialog_layout);
    LinearLayout ll_dialog = (LinearLayout) findViewById(R.id.linearLayout_dialog);     
    final RatingBar rate_bar = new RatingBar(context);
    rate_bar.setOnRatingBarChangeListener(this);
    rate_bar.setStepSize((float) 0.5);
    rate_bar.setMax(5);
    rate_bar.setId(1);   
    rate_bar.setRating(2.0f); // Error occur on this line!
    ll_dialog.addView(rate_bar);
}
...
public void onRatingChanged(RatingBar ratingBar, float rating, boolean fromUser) {
     // TODO Auto-generated method stub
     TextView rate_val = (TextView) findViewById(0);
     rate_val.setText(Float.toString(ratingBar.getRating()));
}

错误堆栈:

Thread [<1> main] (Suspended)   
ActivityThread.performLaunchActivity(ActivityThread$ActivityClientRecord, Intent) line: 1645    
ActivityThread.handleLaunchActivity(ActivityThread$ActivityClientRecord, Intent) line: 1663 
ActivityThread.access$1500(ActivityThread, …

我有这条路线：

            routes.MapRoute(
            "News",
            "News/{id}-{alias}",
            new { controller = "News", action = "Show" },
            new
                {
                    id = @"^[0-9]+$"
                },
            namespaces: new[] { "Site.Controllers" }
        );

这条路线适用于这样的网址：

http://localhost:54010/News/6-news

但不适用于这样的网址：

http://localhost:54010/News/6-nice-news

如何在我的路由值“别名”中使用破折号？

已编辑

路线是这样的：

"News/{id}_{alias}"

适用于两个网址：

http://localhost:54010/News/6_news
http://localhost:54010/News/6_nice-news

我有这个课程:

class Fruit
 attr_accessible :name, :position
 has_many :apples
 default_scope order('position ASC')
end

class Apple
 attr_accessible :name
 belongs_to :fruit
end

怎么按fruit.position排序苹果？

我无法理解我的代码有什么问题(Rails 4):

来自帖子的参数:

{:name => "name"}

新动作:

m=Menu.new(params.permit(:name))

此代码的最后一行生成"无法为菜单:名称大量分配受保护的属性"

我现在正在使用Carrierwave上传图片.一切都很好,除了一个, - 当我添加复选框以删除上传的图像时,我收到错误:"无法批量分配受保护的属性:remove_image".

形成:

...
<%= f.check_box :remove_image %>
<%= f.label :remove_image, "remove image" %>
...

模型:

class Manufacturer < ActiveRecord::Base

  attr_accessible :name, :alias, :short_description, :long_description, :image, :publish,
  :position, :meta_keywords, :meta_description, :meta_title

  mount_uploader :image, ManufacturerUploader

  validates_presence_of :name, :alias
  validates_uniqueness_of :name, :alias
  validates_format_of :alias, :with => /^[a-z\d\-]*$/, :message => "a-z, 0-9 \' - \' ONLY"

  default_scope order('position ASC')

  before_destroy :remember_image
  after_destroy :remove_img

  protected
  def remember_image
    @image_name = self[:image]
  end

  def remove_img
    File.delete("#{Rails.root}/public/images/manufacturer/#{@image_name}")
    File.delete("#{Rails.root}/public/images/manufacturer/thumb_#{@image_name}")
  end

end

提供者:

class ManufacturerUploader < CarrierWave::Uploader::Base

 include …

我有一个奇怪的错误 - 目录中的图像“403 Forbidden” public/images。但是来自嵌套目录的其他图像加载没有问题（ig from public/images/product）。我正在使用 Nginx + 乘客 + capistrano。在 production.rb 我有config.serve_static_assets = true. 也许资产管道出错？

我的桌子:

表格1

id|name_transfer|id_account_from|value_from|id_account_to|value_to
------------------------------------------------------------------
1 |transfer1    |1              |1000      |2            |1000

表2

id|name_account|
----------------
1 |account1    |
2 |account2    |

如何编写查询,我给出了这个:

transfer1|account1|1000|account2|1000

当我使用jQuery.ajax和POST方法从数据库中删除项目时,我收到此错误:

GET Http://localhost:54010/Admin/Category/Delete?id=77 404 Not Found

CategoryController中的操作:

[HttpPost]
public ActionResult Delete(int id) {
  try {
    db.CategoryRepository.Delete(id);
    db.Save();
    return Json(new {Result = "OK"});
  } catch (Exception ex) {
    return Json(new { Result = "ERROR", Message = ex.Message });
  }
}

视图:

<a id="delete-category" class="btn btn-small" href="#">
  <i class="icon-remove"></i>
  @Resource.delete
</a>

JavaScript的:

$(function () {
  $('#delete-category').click(function (event) {
    event.preventDefault();
    $.ajax({
      method: 'POST',
      url: '@Url.Action("Delete","Category")',
      dataType: 'json',
      data: { id: '@Model.CategoryModel.Id' },
      success: function (data, textStatus, jqXHR) {
        console.log("success");
      },
      error: function () …