Question

当我获得Book的数据时，它不会返回值

这里是list.html.erb文件

<table border="1">
    <tr>
            <th>ISBN</th>
            <th>Name</th>
            <th>price</th>
            <th>publish</th>
            <th>published</th>
    </tr>
<%= "asdf" %>
<% @books.each do |book| %>
<%= "asdf" %>
    <tr>
            <td><%= book.isbn %></td>
            <td><%= book.title%></td>
            <td><%= book.price%></td>
            <td><%= book.publish%></td>
            <td><%= book.published%></td>
    </tr>
<% end %>
</table>

，这是fm_controller.rb

    ...
    def list
            @books = Book.all
            @booksCount = Book.count
            puts @books
            puts @booksCount

    end
end

如果您需要更多信息，我很快就会更新。帮助我...

（编辑，更多信息）服务器日志打印像这样

Started GET "/fm/list" for 127.0.0.1 at 2017-03-16 06:59:48 -0700
Processing by FmController#list as HTML
   (0.2ms)  SELECT COUNT(*) FROM `books`
  Book Load (0.1ms)  SELECT `books`.* FROM `books`
  0
Rendering fm/list.html.erb within layouts/application
Rendered fm/list.html.erb within layouts/application (0.6ms)
Completed 200 OK in 15ms (Views: 13.0ms | ActiveRecord: 0.2ms)

@bookCount打印0但mysql表有1行。这是我的查询结果

select * from book;

+------+-------+-------+---------+-----------+
| isbn | title | price | publish | published |
+------+-------+-------+---------+-----------+
| 1111 | asdf  |  1233 | sasdf   | asdf      |
+------+-------+-------+---------+-----------+
1 row in set (0.00 sec)

Answer 1

SELECT * FROM books返回nil 但SELECT * from book返回1个对象。制作你的桌子名册。
Book.all从books表中获取记录而不是book table。

ruby on rails mysql没有返回结果

1 个答案: