ObjectMapper objectMapper = new ObjectMapper(); String containerMatrixJSON = "{\"container_metrics\":{\"cpuRequest\":{\"results\":{\"general_info\":{\"sum\":4.4,\"mean\":1.1,\"units\":\"cores\"}}},\"cpuLimit\":{\"results\":{\"general_info\":{\"su...

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Java - Convert a JSON or Nested JSON into a Map

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

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

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...

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

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

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

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 ...

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Reverse interview

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\": \...

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Read JSON data into a list

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

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