Active Record and PostgreSQL — Ruby on Rails Guides
This guide covers PostgreSQL specific usage of Active Record. After reading this guide, you will know: How to use PostgreSQL's datatypes. How to use UUID primary keys. How to include non-key columns in indexes. How to use deferrable foreign keys. How to use unique constraints. How to implement exclusion constraints. How to implement full text search with PostgreSQL. How to back your Active Record
Rails 5 adds ArrayInquirer and provides friendlier way to check contents in an array | BigBinary Blog
Rails 5 introduces Array Inquirer that wraps an array object and provides friendlier methods to check for the presence of elements that can be either a string or a symbol. pets = ActiveSupport::ArrayInquirer.new([:cat, :dog, 'rabbit']) > pets.cat? #=> true > pets.rabbit? #=> true > pets.elephant? #=> false Array Inquirer also has any? method to check for the presence of any of the passed arguments
A Rule of Thumb for Strong Parameters - Pat Shaughnessy
It can be hard to open the Strong Parameters door and let permitted values into your Rails 4 app. Last week I banged my head against the wall for a few hours trying to figure out how to whitelist input values for my Rails 4 app using the Strong Parameters feature. Calling permit when you have a simple attributes hash for a single new object is straightforward, but figuring out how to call permit f
Rails でPostgreSQLの配列型を試す - yuumi3のお仕事日記
今回の仕事でPostgreSQLの配列(array)型を使えると便利なので試してみました。 Migration Migration で Rails標準の型以外を使うには型の部分を文字列で指定します。 class CreateTodos < ActiveRecord::Migration def self.up create_table :todos do |t| t.date :due t.string :task t.column :opts, "integer[]" t.timestamps end end def self.down drop_table :todos end endrake db:migrateすると無事に 配列型 カラムが出来ました。 > \d todos Table "public.todos" Column | Type | Modifiers -------
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Rails 6 adds if_not_exists option to create_table | BigBinary Blog
Post by @y-yagi
Limit each do loop
any? != ! empty?
