You might try to clean up this code a bit by packaging the key lookup code in a named template.
您可能希望将键查找代码打包在指定模板中，使代码更加清晰。
The latter is actually a primary key lookup against the parent table and constitutes the foreign key constraint verification.
索引扫描实际上是对父表进行主键查找，并完成外键约束验证。
Compare this to Listing 1 where the result of key lookup is immediately narrowed down to the desired string by selecting s: name children.
与清单1相比，在清单1中，通过选择s： name子元素，就可以立即将查找结果限制为目标字符串。
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