method

from

v4.2.7 - Show latest stable - Class: ActiveRecord::QueryMethods

from(value, subquery_name = nil)

public

Specifies table from which the records will be fetched. For example:

Topic.select('title').from('posts')
# => SELECT title FROM posts

Can accept other relation objects. For example:

Topic.select('title').from(Topic.approved)
# => SELECT title FROM (SELECT * FROM topics WHERE approved = 't') subquery

Topic.select('a.title').from(Topic.approved, :a)
# => SELECT a.title FROM (SELECT * FROM topics WHERE approved = 't') a

# File activerecord/lib/active_record/relation/query_methods.rb, line 754
    def from(value, subquery_name = nil)
      spawn.from!(value, subquery_name)
    end

2Notes

How to user method from'

avastor · Feb 20, 2012

==== example User.from('posts').to_sql # => "SELECT users.* FROM posts"

How to user method 'from'