Inserting an Array Using Sequel Gem in Postgresql

Inserting an array using Sequel gem in PostgreSQL

You need to use Sequel's pg_array extension, see http://sequel.rubyforge.org/rdoc-plugins/files/lib/sequel/extensions/pg_array_rb.html

ruby sequel gem - how to query arrays with the pg_array extension

Use the pg_array_ops extension:

Sequel.extension :pg_array_ops
Email.where(Sequel.pg_array_op(:references).contains('5363f773bccf9_32123fe75c45e6f090953@Pauls-MacBook-Pro.local.mail'))

How can I retrieve an array stored in postgresql via Sequel as an array?

This is usually handled when you load the pg_array extension into your Sequel::Database instance. Maybe you just loaded the pg_array extension file without loading it into your Sequel::Database instance. You might have done:

Sequel.extension :pg_array

instead of:

DB.extension :pg_array

You need to load the pg_array extension into your Sequel::Database instance for retrieved values to be array-like objects and not strings.

Ruby Sequel: Array returned by query is being returned as a String object, not an Array object

You need to use DB.extension :pg_array, :pg_inet, :pg_json, not Sequel.extension :pg_array, :pg_inet, :pg_json. Otherwise you are just requiring the files without modifying the configuration for the Sequel::Database instance.

Sequel and Postgres array of enum

Resolve this problem.

If you have in table array enum field u should registrate array type:

DB.extension :pg_array
DB.register_array_type(:enum_cars)

Inserting validation constraints using Sequel gem in PostgreSQL database

You can put into your model something like:

class Model < Sequel::Model
  plugin :validation_helpers

  def validate
    validates_format /\A[\w+\-.]+@[a-z\d\-.]+\.[a-z]+\z/i, :email
  end
end

Postgres and Ruby's Sequel: Empty array in where-clause getting converted to slow query

There is a closed issue on github about this behavior.

I agree with jeremyevans that there is no need for a fix, because it is obvious that the reseult will and should always be empty. Furthermore you would agrue that PostgreSQL should be clever enough to optimize queries like that and should not do a whole table scan.

Therefore it makes way more sense IMHO to fix this behavior in the code to avoid to call the database completely:

user_ids.present? ? User.where(id: user_ids) : []

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