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How can I rename a database column in a Ruby on Rails migration?
...f your app running, say in different environments or on multiple computers etc, managing edited migrations is a major pain. I only edit a migration if I just created it and realized it was wrong, and haven't run it literally anywhere else yet.
– Yetanotherjosh
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How to count objects in PowerShell?
...re-Object; and returns a lot of other stuff -- like Average, Sum, Maximum, etc...
– BrainSlugs83
Apr 28 '17 at 18:48
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Multiline syntax for piping a heredoc; is this portable?
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This is pretty sweet when using sudo tee /etc/securefile.conf <<EOF.
– dragon788
Jul 19 '17 at 23:18
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Can I draw rectangle in XML?
...s you could use the rectangle as the background for ListViews, TextViews...etc.
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Maven dependency for Servlet 3.0 API?
...et container (tomcat, jetty) vs a JEE compliant container (TomEE, wildfly, etc)
– YoYo
Nov 7 '14 at 7:01
1
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Is it a good practice to place C++ definitions in header files?
...braries you need to link to for certain parts such as threads, filesystem, etc). A Primary example is that you cannot have simple global objects in header only libs (unless you resort to the abomination that is a singleton) as you will run into multiple definition errors. NOTE: C++17's inline variab...
How do I wrap link_to around some html ruby code?
...k_to with a block:
<% link_to(@album) do %>
<!-- insert html etc here -->
<% end %>
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data.table vs dplyr: can one do something well the other can't or does poorly?
...ll become a column in result. You can use c(), as.list(), lapply(), list() etc... base functions to accomplish this, without having to learn any new functions.
You will need to learn just the special variables - .N and .SD at least. The equivalent in dplyr are n() and .
Joins
dplyr provides s...
Using Excel OleDb to get sheet names IN SHEET ORDER
...is a german file (Arbeitsblätter = worksheets).
The table names (Tabelle3 etc) are in the correct order. You just need to read these tags;)
regards
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Python TypeError: not enough arguments for format string
...ome code examples of how your solution works, and how it fails without it, etc. might be useful. See How do I write a good answer?. Note that this is a 5 year old question, so you should add an answer only if it provides significantly more information than those already there.
–...