ruby-on-rails - 大礼包的使用仅限于 1 个特殊报价？

Question

例如

       insert_after :homepage_products do
       "
            <h1>Promotional Item</h1>
            <% products=Product.find_by_sql('select * from products where id in (select product_id from products_taxons where taxon_id in (select id from taxons where name='Promotion'))') %>
            <%= render 'shared/products', :products => products, :taxon => @taxon %>
    "
       end

会给出这个错误

compile error
inline template:3: syntax error, unexpected tCONSTANT, expecting ')'
...m taxons where name='Promotion'))') 
                              ^
inline template:3: syntax error, unexpected ')', expecting kEND
...ons where name='Promotion'))') 
                              ^

这里的问题是这条线

select * from products where id in (select product_id from products_taxons where taxon_id in (select id from taxons where name='Promotion')

给出语法错误的用法，'但如果我将其更改为"Promotion"，它将看起来像这样

       insert_after :homepage_products do
       "
            <h1>Promotional Item</h1>
            <% products=Product.find_by_sql('select * from products where id in (select product_id from products_taxons where taxon_id in (select id from taxons where name="Promotion"))') %>
            <%= render 'shared/products', :products => products, :taxon => @taxon %>
    "
       end

注意促销词是如何变成不同颜色的？因为它与前面的重叠"

还有其他可以在这里使用的“特殊字符”吗？

还是有其他选择？

Answer 1

找到了答案

    <% sql_string = "select * from products where id in (select product_id from products_taxons where taxon_id in (select id from taxons where name=\"Promotion\"))" %>
    <% products=Product.find_by_sql(sql_string) %>

只是把\

Answer 2

我在项目中使用的另一种方法是使用备用 Ruby 语法进行引用，例如：

insert_after :homepage_products do
  %(
    <h1>Promotional Item</h1>
    <% products=Product.find_by_sql('select * from products where id in (select product_id from products_taxons where taxon_id in (select id from taxons where name="Promotion"))') %>
    <%= render 'shared/products', :products => products, :taxon => @taxon %>
  )
end

当然，您也可以将您的代码放入一个部分并将部分提供给钩子

insert_after :homepage_products, 'shared/hooks/_after_homepage_products'

值得一提的是，在最新的大礼包版本中，这个钩子系统已被弃用，取而代之的是deface gem。