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How to change a nullable column to not nullable in a Rails migration?
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edited Mar 17 '18 at 12:42
Dorian
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DataTable: Hide the Show Entries dropdown but keep the Search box
...es dropdown but keep the Search box in DataTable? I want to always display 10 rows with pagination at the bottom along with search box but do not want to display the Show entries dropdown.
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Changing a specific column name in pandas DataFrame
...ns = {'two':'new_name'})
In [28]: df
Out[28]:
one three new_name
0 1 a 9
1 2 b 8
2 3 c 7
3 4 d 6
4 5 e 5
Following is the docstring for the rename method.
Definition: df.rename(self, index=None, columns=None, copy=Tr...
Java 8 forEach with index [duplicate]
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170
Since you are iterating over an indexable collection (lists, etc.), I presume that you can the...
Long-lasting FB access-token for server to pull FB page info
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189
These are the steps that were previously in the question - they have been migrated to this ...
How to make UIButton's text alignment center? Using IB
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15 Answers
15
Active
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How to delete multiple buffers in Vim?
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196
You can use <C-a> to complete all matches. So if you type :bd *.xml and then hit <C-a...
Working with time DURATION, not time of day
...me" data type - just change the format!
Excels time/date format is simply 1.0 equals 1 full day (starting on 1/1/1900). So 36 hours would be 1.5. If you change the format to [h]:mm, you'll see 36:00.
Therefore, if you want to work with durations, you can simply use subtraction, e.g.
A1: Start: ...
Creating an array of objects in Java
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A[] a = new A[4];
...creates 4 A references, similar to doing this:
A a1;
A a2;
A a3;
A a4;
Now you couldn't do a1.someMethod() without allocating a1 like this:
a1 = new A();
Similarly, with the array you need to do this:
a[0] = new A();
...before using it.
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