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https://guides.rubyonrails.org/active_record_postgresql.html
In order to use the PostgreSQL adapter you need to have at least version 9.3 installed. Older versions are not supported. To get started with PostgreSQL have a look at the configuring Rails guide. It describes how to properly setup Active Record for PostgreSQL.
http://blog.plataformatec.com.br/2014/07/rails-4-and-postgresql-arrays/
Rails 4 supports arrays fields for PostgreSQL in a nice way, although it is not a very known feature. In order to demonstrate its usage it’s useful to explain the context where this was used. PostgreSQL Arrays and Rails Migrations Suppose we have a Product model with the following fields: name, category_id and tags.
https://stackoverflow.com/questions/15213251/rails-3-postgres-array-support
Sep 04, 2016 · i have a query in postgres that returns back a postgres array in one of the columns: SELECT e.context->'device' AS device, count(e.data->'model_name') AS members, ARRAY_AGG(e.data->'model... Stack Overflow. Products ... rails 3 postgres array support…
https://dockyard.com/blog/ruby/2012/09/18/rails-4-sneak-peek-postgresql-array-support
Sep 18, 2012 · Ruby I’m happy to announce that Rails 4.0 now has support for PostgreSQL arrays. You can create an array column easily at the time of migration by adding :array => true. Creating an array column will respect the other options you add to the column (length, default, etc).
https://coderwall.com/p/sud9ja/rails-4-the-postgresql-array-data-type
Jul 27, 2013 · Rails 4 & the PostgreSQL Array data type. active record postgres array postgresql data type rails 4. Active Record 4 now has support for PG's Array data-type. Here's how you might use it to give users multiple email addresses: Migration:
https://www.postgresql.org/docs/current/arrays.html
The first two only support one-dimensional arrays, but array_cat supports multidimensional arrays. Some examples: ... Also, for backward compatibility with pre-8.2 versions of PostgreSQL, the array_nulls configuration parameter can be turned off to suppress recognition of NULL as a NULL.
https://www.digitalocean.com/community/tutorials/how-to-use-postgresql-with-your-ruby-on-rails-application-on-ubuntu-14-04
Mar 18, 2015 · sudo apt-get install postgresql postgresql-contrib libpq-dev PostgreSQL is now installed but you should create a new database user, that your Rails application will use. Create Database User. Create a PostgreSQL superuser user with this command (substitute the highlighted word with your own username): sudo -u postgres createuser -s pguser
https://www.postgresql.org/docs/9.1/arrays.html
PostgreSQL allows columns of a table to be defined as variable-length multidimensional arrays. Arrays of any built-in or user-defined base type, enum type, or composite type can be created. Arrays of domains are not yet supported. 8.14.1.
https://github.com/rails/rails/pull/7547
PostgreSQL array type support. Any datatype can be used to create an array column, with full migration and schema dumper support. To declare an array column, use the following syntax: create_table...
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