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Circular (or cyclic) imports in Python
What will happen if two modules import each other?
11 Answers
11
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How to list of all the tables defined for the database when using active record?
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An update for Rails 5.2
For Rails 5.2 you can also use ApplicationRecord to get an Array with your table' names. Just, as imechemi mentioned, be aware that this method will also return ar_internal_metadata and schema_migrations in that array.
ApplicationRecord.connection.tables
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How to redirect to a 404 in Rails?
...ow a 404 page, create a render_404 method (or not_found as I called it) in ApplicationController like this:
def not_found
raise ActionController::RoutingError.new('Not Found')
end
Rails also handles AbstractController::ActionNotFound, and ActiveRecord::RecordNotFound the same way.
This does t...
“android.view.WindowManager$BadTokenException: Unable to add window” on buider.show()
...tion: Unable to add window"
Problem :
This exception occurs when the app is trying to notify the user from
the background thread (AsyncTask) by opening a Dialog.
If you are trying to modify the UI from background thread (usually
from onPostExecute() of AsyncTask) and if the activity ...
Mounting multiple volumes on a docker container?
...sr/workspace/proj/WebContent/file:/tst gcc:4.9 sh -c 'cd mycode; gcc -o myapp ./mycode.c; cd tst; ./myapp < ./test.txt' This is my command, I'm trying to compile the mycode.c that is in the first volume, but give that same file an stdin from a different volume. How do I do it?
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How efficient can Meteor be while sharing a huge collection among many clients?
...cription, the merge box is
essentially a pass-through. But a more complex app can have multiple
subscriptions which might overlap. If two subscriptions both set the
same attribute on the same document, the merge box decides which value
takes priority and only sends that to the client. We haven't ...
Flattening a shallow list in Python [duplicate]
...hat's iterable, which should include Django's iterable QuerySets, which it appears that you're using in the question.
Edit: This is probably as good as a reduce anyway, because reduce will have the same overhead copying the items into the list that's being extended. chain will only incur this (same...
cancelling a handler.postdelayed process
...dler.postDelayed() to create a waiting period before the next stage of my app takes place. During the wait period I am displaying a dialog with progress bar and cancel button.
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Is it secure to store passwords as environment variables (rather than as plain text) in config files
I work on a few apps in rails, django (and a little bit of php), and one of the things that I started doing in some of them is storing database and other passwords as environment variables rather than plain text in certain config files (or in settings.py, for django apps).
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GridLayout (not GridView) how to stretch all children evenly
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Appcompat21 GridLayout has the column and row weights which can be used like below to evenly create each grid item in the gridlayout like the image above.
<android.support.v7.widget.GridLayout
xmlns:android="http://schem...