How开发者_StackOverflow do you do a query that includes a \"where exists\" in Arel? For example on a query like this to show all the suppliers with at least one order:
Wondering with the upgrade to Arel, if ActiveRecord yet supports an automated way to select in the columns from joined tables, without having to explicitly list them in a select clause.
model Post # ActiveRecord associations have tons of options that let # you do just about anything like:
Whenever i tried to use Table.create :a=>\"a\", :b=>\"b\" or tab开发者_StackOverflow=Table.new tab.a=\"a\"
What does AREL stand f开发者_开发技巧or? I couldn\'t find what\'s the meaning of this acronym anywhere.This?https://github.com/nkallen/arel\"A RELational algebra\"
I want to be able to override certain methods in ActiveRecord::QueryMethods for educational and experimental reasons.
Is there a wa开发者_如何学Cy to convert the MATCH and AGAINST parts to Arel? I could not find anything about it in the Arel source code.
Let\'s say we have the following: irb> Post.where(:hidden => true).to_sql =&开发者_C百科gt; \"SELECT `posts`.* FROM `posts` WHERE posts.hidden = 1\"
Consider a simple association... class Person has_many :friends end class Friend belongs_to :person end What is the cleanest way to get all persons that have NO friends in ARel and/or meta_where?
I have some scopes definied in a Model called Events. Now I need join them using OR operator. I’m using Rails3 and I’m a bit confused with ActiveRelation & Arel and how and how I should use this
加载中,请稍侯......