In my Rails app, I loop through an array to create a list of conditions that must be joined by OR. Below is the basic flow of how I currently do so.
conditions = nil
set.each do |value|
condition = value.to_condition
conditions = conditions ? conditions.or(condition) : condition
end
Obviously, it s not beautiful, but I still don t fully know my way around Arel. Does it offer any better way of OR-joining a set of dynamically-generated conditions?
This is a perfect fit for an inject which will give you a one-liner you can use within something else as well:
conditions = set.inject { |conds, cond| conds.or(cond) } which can even be written: set.inject(&:or) which is very nice.
I think that s basically it. I d initialize conditions to the base object to avoid the ternary:
scope = Article
set.each{|v| scope = scope.or(v.to_condition)}
collection_select and select Rails helpers: Which one should I use? I can t see a difference in both ways. Both helpers take a collection and generates options tags inside a select tag. Is there a ...
We ve deployed our rails app to EC2. In our setup, we have two proxies on small instances behind round-robin DNS. These run nginx load balancers for a dynamically growing and shrinking farm of web ...
As part of a web application I need an auth-code to pass as a URL parameter. I am currently using (in Rails) : Digest::SHA1.hexdigest((object_id + rand(255)).to_s) Which provides long strings like : ...
I ve installed RubyCAS-Client version 2.1.0 as a plugin within a rails app. It s working, but I d like to remove the ?ticket= in the url. Is this possible?
I have a these 3 models: class User < ActiveRecord::Base has_many :permissions, :dependent => :destroy has_many :roles, :through => :permissions end class Permission < ActiveRecord::...
I m building an xml document from a hash. The xml attributes need to be in order. How can this be accomplished? hash.to_xml
guys which text editor is good for Rubyonrails? i m using Windows and i was using E-Texteditor but its not free n its expired now can anyone plese tell me any free texteditor? n which one is best an ...
I’m developing an application dedicated to generate statistical reports, I would like that user after saving their stat report they save sql queries too. To do that I wrote the following module: ...