Admin
May 06, 2022
24 comments
1.11K
You need to use `newline=""` when using a csv.writer() with Python 3.x, wb is used for Python 2.x versions. Using the sample JSON you've given, you would just need to iterate over the header fields and create a row from each entry in details. For...
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Convert JSON to CSV
Admin
Feb 25, 2022
9 comments
797
2.1. ClassLoader.getResourceAsStream() Use the getResourceAsStream() method to get the InputStream when reading a file from inside a jar file. Always use this method on the ClassLoader instance. private InputStream getFileAsIOStream(final St...
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Read a file from the ‘resources’ folder
Feb 16, 2022
14 comments
897
What is A/B testing? A/B testing (also known as bucket testing or split-run testing) is a user experience research methodology. A/B tests consist of a randomized experiment with two variants, A and B. It includes application of statistical hypoth...
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A/B testing
> User.reflect_on_all_associations.map(&:name) > [:addresses, :cookies, :posts]
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Fetch names of associated ActiveRecord models in Rub...
Admin
Sep 27, 2021
24 comments
151
Error on installing mailcatcher The command: gem install mailcatcher fails with error: - ERROR: Error installing mailcatcher: ERROR: Failed to build gem native extension make "DESTDIR=" compiling parser.c parser.rl:112:17: warnin...
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Error installing mailcatcher
Admin
Sep 27, 2021
6 comments
1.02K
Error on installing mailcatcher The command: gem install mailcatcher fails with error: - ERROR: Error installing mailcatcher: ERROR: Failed to build gem native extension Solution gem install mailcatcher -- --with-cflags="-Wn...
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Error installing mailcatcher
Jul 04, 2021
22 comments
412
Problem Sometimes while running `bundle install` during setting up a new project, you might get the following error:   Installing pg 1.2.0 with native extensions Gem::Ext::BuildError: ERROR: Failed to build gem native extension. current dir...
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Error installing `pg` gem
Apr 04, 2021
12 comments
1.07K
Reverse interview This is a list of questions which may be interesting to a tech job applicant. The points are not ordered and many may not apply to a given position, or work type. It was started as my personal list of questions, which grew over ...
Tutorial
Reverse interview
Admin
Feb 09, 2021
16 comments
966
String jsonData = "[\r\n" + " {\r\n" + " \"CompType\": \"Substrate\",\r\n" + " \"CompName\": \"80101-106DSA\",\r\n" + " \"CompRev\": \"BA\",\r\n" + " },\r\n" + " {\r\n" + " \"CompType\": \"Substrate\",\r\n" + " \"CompName\": \"80101-106J...
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Read JSON data into a list
Admin
Jul 11, 2020
24 comments
607
Suppose you want to remove a 'comments' table from a blog application. You can do so by performing the following tasks from the command line (e.g., Terminal). Step one: $ rails console Step two: $ ActiveRecord::Migration.drop_table(:c...
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Delete table
Admin
Jun 23, 2020
19 comments
1.09K
Issue 1 - Error in installing pg gem Installing pg 0.19.0 with native extensions Gem::Ext::BuildError: ERROR: Failed to build gem native extension. current directory: /home/luke/.rvm/gems/ruby-2.4.1/gems/pg-0.19.0/ext /home/luke/.rvm/rub...
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Common Ruby on Rails gem installation errors
Admin
Apr 09, 2020
15 comments
951
In JavaScript, you can use following two ways to get hidden field value in a form : document.getElementById(‘hidden field id’).value document.formName.elements[‘hidden field name’].value See an example here… function printIt(){ ...
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Pass value from JSP to Javascript