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What is causing this ActiveRecord::ReadOnlyRecord error?

This follows this prior question, which was answered. I actually discovered I could remove a join from that query, so now the working query is ...
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C++11 reverse range-based for-loop

Is there a container adapter that would reverse the direction of iterators so I can iterate over a container in reverse with range-based for-loop? ...
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How to expire session due to inactivity in Django?

Our Django application has the following session management requirements. 6 Answers 6 ...
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Can I serve multiple clients using just Flask app.run() as standalone?

I know I can link Flask with Apache or other web servers. But, I was thinking of running Flask as a standalone server serving multiple clients simultaneously. ...
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git push to specific branch

Even after reading this question: git-push-current-branch , I am still having difficulty figuring out how I should write my git push command. As mentioned in the question link, it's not clear from the documentation. ...
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What exactly does stringstream do?

I am trying to learn C++ since yesterday and I am using this document: http://www.cplusplus.com/files/tutorial.pdf (page 32) . I found a code in the document and I ran it. I tried inputting Rs 5.5 for price and an integer for quantity and the output was 0. I tried inputting 5.5 and 6 and the output...
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Track a new remote branch created on GitHub

I have already got a local master branch tracking the remote master branch of a github project. Now, a collaborator of mine has created a new branch in the same project, and I want to do the following accordingly: ...
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Django's SuspiciousOperation Invalid HTTP_HOST header

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I need to pop up and trash away a “middle” commit in my master branch. How can I do it?

For example, in the following master branch, I need to trash just the commit af5c7bf16e6f04321f966b4231371b21475bc4da, which is the second due to previous rebase: ...
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postgresql return 0 if returned value is null

I have a query that returns avg(price) 3 Answers 3 ...