blocks|key|456917|text|使用?语法是正确的，但是对select的调用需要将其拆分为对where整数的调用。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|456918|另外，您正在将日期转换为字符串(例如，'#{start_date}')。这样，被调用的方法将无法将值作为日期处理，并将其格式化。相反，只需传递原始日期(例如，start_date)。|456919|Product
++.joins('LEFT+JOIN+orders+ON+orders.product_id+=+products.id')
++.where('orders.order_at+BETWEEN+?+AND+?',+start_date,+end_date)
++.select("SUM(orders.qty)+as+qty,+products.*")
++.group('products.id')|code-block|syntax|javascript|456920|您还可以根据daino3+3的答案(+where+)重做.where(orders:+{order_at:+start_date..end_date})调用。|456921|推理|456922|关键是不要在where+(或相关的)调用中直接嵌入参数。这样做会打开您的代码，使您的代码面临主要的安全风险，即SQL注入，因为远程用户可能会将任意的数据串放入数据库中，从而触发正在执行的各种危险调用。|456923|这就是为什么您应该始终使用where('various+sql+things+?',+parameter)而不是where("various+sql+things+#{parameter}")。|456924|有关向Rails+sql调用传递参数的更多信息，请查看活动记录查询接口官方Rails指南。|456925|entityMap|0|LINK|mutability|MUTABLE|url|https://en.wikipedia.org/wiki/SQL_injection|1|http://guides.rubyonrails.org/active_record_querying.html#conditions^0|2|1|D|6|U|5|0|J|F|27|A|0|0|J|5|S|1C|0|0|6|5|1J|5|0|0|D|14|1K|14|0|R|H|1|0^^$0|@$1|2|3|4|5|6|7|16|8|@$9|17|A|18|B|C]|$9|19|A|1A|B|C]|$9|1B|A|1C|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1D|8|@$9|1E|A|1F|B|C]|$9|1G|A|1H|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|1I|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1J|8|@$9|1K|A|1L|B|C]|$9|1M|A|1N|B|C]]|D|@]|E|$]]|$1|O|3|P|5|6|7|1O|8|@]|D|@]|E|$]]|$1|Q|3|R|5|6|7|1P|8|@$9|1Q|A|1R|B|C]]|D|@$9|1S|A|1T|1|1U]]|E|$]]|$1|S|3|T|5|6|7|1V|8|@$9|1W|A|1X|B|C]|$9|1Y|A|1Z|B|C]]|D|@]|E|$]]|$1|U|3|V|5|6|7|20|8|@]|D|@$9|21|A|22|1|23]]|E|$]]|$1|W|3|-4|5|6|7|24|8|@]|D|@]|E|$]]]|X|$Y|$5|Z|10|11|E|$12|13]]|14|$5|Z|10|11|E|$12|15]]]]

You’re right to use the <code>?</code> syntax, but your call to <code>select</code> needs part of it split out into a call to <code>where</code> intead.

Also, you’re converting your dates to strings (e.g., <code>'#{start_date}'</code>). That prevents the called method from being able to handle, and format, the values as dates. Instead, just pass the raw dates (e.g., <code>start_date</code>).

<pre><code>Product
 .joins('LEFT JOIN orders ON orders.product_id = products.id')
 .where('orders.order_at BETWEEN ? AND ?', start_date, end_date)
 .select("SUM(orders.qty) as qty, products.*")
 .group('products.id')
</code></pre>

You could also redo the <code>where</code> call based on daino3’s answer (<code>.where(orders: {order_at: start_date..end_date})</code>).

<h1>Reasoning</h1>

It’s critical to not embed parameters directly in <code>where</code> (or related) calls. Doing so opens your code up to major security risks, known as <a href="https://en.wikipedia.org/wiki/SQL_injection" rel="nofollow noreferrer">SQL Injection</a> because a remote user could potentially put any arbitrary string of data triggering all manner of dangerous calls being performed on your database.

That’s why you should always do <code>where('various sql things ?', parameter)</code> instead of <code>where("various sql things #{parameter}")</code>.

For more on the subject of passing in parameters to Rails sql calls like this, check out the <a href="http://guides.rubyonrails.org/active_record_querying.html#conditions" rel="nofollow noreferrer">official Rails Guide on the Active Record Query Interface</a>.

blocks|key|456941|text|我相信您也可以用where子句删除CASE语句：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|456942|检出范围条件|offset|length|456943|Product
++.joins('LEFT+JOIN+orders+ON+orders.product_id+=+products.id')
++.where(orders:+{order_at:+start_date..end_date})+++#+range+condition
++.group('products.id')
++.select("SUM(orders.qty)+as+qty,+products.*")|code-block|syntax|javascript|456944|entityMap|0|LINK|mutability|MUTABLE|url|http://guides.rubyonrails.org/active_record_querying.html#range-conditions^0|0|0|6|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@$D|U|E|V|1|W]]|A|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

I believe you can also get rid of the CASE statement with a where clause:

<a href="http://guides.rubyonrails.org/active_record_querying.html#range-conditions" rel="nofollow noreferrer">checkout range conditions</a>

<pre><code>Product
 .joins('LEFT JOIN orders ON orders.product_id = products.id')
 .where(orders: {order_at: start_date..end_date}) # range condition
 .group('products.id')
 .select("SUM(orders.qty) as qty, products.*")
</code></pre>

I am working with the brakeman gem (which identifies possible security issues in Ruby on Rails code). We have a scope which uses joins, group and select and I need to update the select part of the query. This scope looks something like the below. I am putting content of the scope here on product model.

<pre><code>Product.joins('LEFT JOIN orders ON orders.product_id = products.id')
 .group('products.id')
 .select(
 "SUM(CASE WHEN orders.order_at BETWEEN '#{start_date}' AND '#{end_date}'" \
 " THEN orders.qty ELSE 0 END) as qty, products.*"
 )
</code></pre>

Now If i try to change query like this 

<pre><code>Product.joins('LEFT JOIN orders ON orders.product_id = products.id')
 .group('products.id')
 .select(
 "SUM(CASE WHEN orders.order_at BETWEEN ? AND ?" \
 " THEN orders.qty ELSE 0 END) as qty, products.*",
 '#{start_date}',
 '#{end_date}'
 )
</code></pre>

It gives me syntax error where I have <code>?</code> I have also tried some other ways with group and having but it didn't worked for me. I am using postgres sql with rails 4.1.8 
Is their any way I can achieve this? Thanks in advance.

This is the error

<blockquote>
 PG::SyntaxError: ERROR: syntax error at or near "?" 
 LINE 1: SELECT
 SUM(CASE WHEN orders.order_at BETWEEN ? AND ? AND ord
</blockquote>

Passing date parameters to a sql select query in rails (QueryMethods)

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在使用brakeman (它识别Rails代码中可能存在的安全问题)。我们有一个使用联接、组和select的范围，我需要更新查询的select部分。此范围如下所示。我把范围的内容放在产品模型上。Product.joins('LEFT JOIN orders ON orders.product_id = produc...

问将日期参数传递给rails中的select查询(QueryMethods)
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