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Postgres complex data types (hstore, json, jsonb, array) are very useful tools in database design. Having multiple values under one attribute definitely has its use cases. There are plenty of articles that compare the NoSQL database performance to the PostgreSQL JSON datatypes. Their results show the maturity of tools provided by this database management system. So which data types are best suited for what?
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 Most of the time when we need to query some data from our database in a Rails based application, we just use ActiveRecord query interface. When the query is more complicated, we write it using SQL language. Sometimes it may be needed to use such SQL query in more than one place. In such cases (to better stick to the DRY principle), we can consider using a database view. In this blog post, I will present what are the database views and how to easily use them in Ruby on Rails application with the help of a Scenic gem.
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Thread synchronization is a topic that gives many developers nightmares. It's a very serious issue, hard to debug and solve, especially in desktop apps. However, web developers sometimes also have to tackle the challenge of making multiple threads work nicely with each other. So, what exactly is the problem here?
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