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Rails: how do I validate that something is a boolean?
...ion_of :field_name, :in => [true, false]
From an older version of the API: "This is due to the way Object#blank? handles boolean values. false.blank? # => true"
I'm not sure if this will still be fine for Rails 3 though, hope that helped!
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How do you manually execute SQL commands in Ruby On Rails using NuoDB
...nnection without calling ActiveRecord::Base.clear_active_connections!. See api.rubyonrails.org/v5.2/classes/ActiveRecord/…
– eremite
Jun 29 '18 at 18:08
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How to subtract date/time in JavaScript? [duplicate]
...ou are probably better off using moment.js which offers powerful localized APIs. For example, this is what I have in my utils.js:
subtractDates: function(date1, date2) {
return moment.subtract(date1, date2).milliseconds();
},
millisecondsSince: function(dateSince) {
return moment().subtract...
Change one value based on another value in pandas
...ere.
Assuming you can load your data directly into pandas with pandas.read_csv then the following code might be helpful for you.
import pandas
df = pandas.read_csv("test.csv")
df.loc[df.ID == 103, 'FirstName'] = "Matt"
df.loc[df.ID == 103, 'LastName'] = "Jones"
As mentioned in the comments, you ...
Git for Windows - The Program can't start because libiconv2.dll is missing
...roups.google.com/forum/#!topic/msysgit/twrVn_EbNI4
cd into your git install directory
copy mingw\bin\libiconv-2.dll libexec\git-core
(or copy bin\libiconv-2.dll libexec\git-core if your installation has no mingw folder)
In the linked thread Drew asks for assistance, so if you think you can help...
How to create a fixed-size array of objects
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Fixed-length arrays are not yet supported. What does that actually mean? Not that you can't create an array of n many things — obviously you can just do let a = [ 1, 2, 3 ] to get an array of three Ints. It means simply that array size is not something that you can declare as type inf...
Create an array with random values
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var random_array = new Array(40).fill().map((a, i) => a = i).sort(() => Math.random() - 0.5); I think this does the same as above
– Jamie337nichols
Sep 16 '19 at 18:47
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Weird PHP error: 'Can't use function return value in write context'
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You mean
if (isset($_POST['sms_code']) == TRUE ) {
though incidentally you really mean
if (isset($_POST['sms_code'])) {
share
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improve thi...
Remove all special characters from a string in R?
How to remove all special characters from string in R and replace them with spaces ?
3 Answers
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新手程序员应该知道的7件事 - 创意 - 清泛网 - 专注C/C++及内核技术
...了人际交往能力的重要性，他说：“如果你通过再次查阅API和调试，依然不能弄清楚问题的根源，那就应该寻求帮助。哪怕你觉得你写的是杰作，也并不意味着没有废话或者不能更好。要和同事融洽相处。有时候只需要大声地说...