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What is causing ERROR: there is no unique constraint matching given keys for referenced table?
...atching 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 replace a string in multiple files in linux command line
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I just did this in my git repo and now git status returns: error: bad index file sha1 signature.... fatal: index file corrupt. What gives?
– Jin
Feb 2 '18 at 20:51
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What's the _ underscore representative of in Swift References?
...ction without an external name.
Update for Swift 2.0
Function and method now work the same way in terms of local and external argument name declaration.
Functions are now called by using external parameter name by default, starting at 2nd parameter. This rule only applies to pure Swift code.
So,...
AttributeError: 'module' object has no attribute 'tests'
...ews.py) was still trying to import the deleted model.
When I took out the now-obsolete import statement, problem solved.
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Set cURL to use local virtual hosts
... url = "curl.haxx.se/docs/manpage.html"
-O
referer = "http://nowhereatall.com/"
# --- End of example file ---
This option can be used multiple times to load multiple config files.
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MySQL - Rows to Columns
... 2 | 9 | NULL | 40 |
+--------+------+------+------+
(Note that we now have one row per y-value.) Okay, we're almost there! We just need to get rid of those ugly NULLs.
Step 4: prettify. We're just going to replace any null values with zeroes so the result set is nicer to look at:
creat...
Why am I seeing “TypeError: string indices must be integers”?
...;>> my_string[my_tuple]
TypeError: string indices must be integers
Now, at least, the error message makes sense.
Solution
We need to replace the comma , with a colon : to separate the two integers correctly:
>>> my_string = "hello world"
>>> my_string[0:5]
'hello'
A cl...
MySQL - ORDER BY values within IN()
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Careful. Any unknown property value (not in the list) will take precedence over the known values, i.e. FIELD(letter, 'A', 'C'), the list will first return entries with B letter first (assuming a set of records with A | B | C values). To avoi...
Boolean vs boolean in Java
...memory expense The second will save you a lot more memory, so go for it
Now choose your way.
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Search for selection in vim
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Use q / instead of just /. (Same with q :). Now you can VIM-edit through your command and search history! (Try Ctrl-N and Ctrl-P sometime).
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