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What is causing ERROR: there is no unique constraint matching given keys for referenced table?
Below example table structure gives an ERROR: there is no unique constraint matching given keys for referenced table, and having stared at it for while now I can't figure out why this error arises in this situation.
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How to do date/time comparison
Is there any options in doing date comparison in Go? I have to sort data based on date and time - independently. So I might allow an object that occurs within a range of dates so long as it also occurs within a range of times. In this model, I could not simply just select the oldest date, youngest t...
How to hash a string into 8 digits?
Is there anyway that I can hash a random string into a 8 digit number without implementing any algorithms myself?
4 Answers...
Add legend to ggplot2 line plot
...plot three lines in the same graph and want to add a legend with the three colors used. This is the code used
3 Answers
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nginx: [emerg] could not build the server_names_hash, you should increase server_names_hash_bucket_s
I'm in the process of setting up a new server. The http-Server of my choice is NGINX. I want to add the domain audi-freunde-einbeck.de as a virtual host. I already have 2 other domains in there and it works fine, but when I try to add the above mentioned domain and start the server it gives me Jo...
DialogFragment setCancelable property not working
I am working in an android application and am using a DialogFragment to show a dialog and I want to make that DialogFragment not cancelable. I have made the dialog cancelable property to false, but still its not affecting.
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Sending a JSON to server and retrieving a JSON in return, without JQuery
I need to send a JSON (which I can stringify) to the server and to retrieve the resulting JSON on the user side, without using JQuery.
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Joda-Time: what's the difference between Period, Interval and Duration?
In Joda-Time 2, what is the difference between the three kinds of time spans:
2 Answers
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Set margin size when converting from Markdown to PDF with pandoc
I have created an RMarkdown file in RStudio and managed to knit it with knitr into an HTML and .md file. Next, I used pandoc to convert the .md file into a PDF file (I get an error if I try and convert from the .html file). However, the PDF that is produced have massive margins (like this http://...
setNeedsLayout vs. setNeedsUpdateConstraints and layoutIfNeeded vs updateConstraintsIfNeeded
I know that the auto layout chain consists in basically 3 different process.
2 Answers
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