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All Ruby tests raising: undefined method `authenticate' for nil:NilClass
...wing and I don't understand why. All methods call raise the 'authenticate' error. I've checked the code if there was a method called "authenticate" but there is no such method.
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Removing pip's cache?
... I have pip 20.1.1 but when I try pip cache purge I get next error: ERROR: No matching packages but I installed a lot of different packages already
– Mikhail_Sam
Jun 16 at 10:59
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Best practices for SQL varchar column length [closed]
...d, etc.
Basically, just come up with reasonable business constraints and error on a slightly larger size. As @onedaywhen pointed out, family names in UK are usually between 1-35 characters. If you decide to make it varchar(64), you're not really going to hurt anything... unless you're storing this...
How can I set a custom date time format in Oracle SQL Developer?
...-MON-RR HH24:MI:SS
As a result, it keeps the default format, without any error.
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No increment operator (++) in Ruby? [duplicate]
... x++ then Ruby expects another operand. This is why you tend to get syntax errors if you try to use ++ at the moment as Ruby takes part of the next statement as the operand. += is implemented as call + on the receiver passing the RHS as a parameter and then assign the value returned by + to the vari...
How to check if a file is empty in Bash?
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Using the tool shellcheck can find spelling errors just fine.
– Yokai
Oct 3 '16 at 3:30
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how to use javascript Object.defineProperty
...f not true, the property is read only; attempt to write is ignored without error*!
Both descriptors can have these members:
configurable - default false; if not true, the property can't be deleted; attempt to delete is ignored without error*!
enumerable - default false; if true, it will be iter...
Rename a class in Xcode: Refactor… is grayed out (disabled). Why?
...ame" in latest xcode and it failed - again!
(this time with the incorrect error: "Unable to determine the language of", one of those error messages where Apple put the wrong text in place)
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How to create a database from shell command?
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I get this error ERROR 1046 (3D000) at line 27: No database selected when I run echo "create database databasename" | mysql -u -u username -p command
– keerthi
Mar 15 '13 at 5:16
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TypeError: ObjectId('') is not JSON serializable
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Most users who receive the "not JSON serializable" error simply need to specify default=str when using json.dumps. For example:
json.dumps(my_obj, default=str)
This will force a conversion to str, preventing the error. Of course then look at the generated output to confirm...