#Relata#

Helps poking around with relationships when using ARel.

Install

gem install relata

DSL API

If you want to use the DSL, you need to require it first:

require 'relata/dsl'

Now you are ready to wherize everything. First things first, querying a field:

Post.where(:body).like?("%caelum%")

Proc style querying: select all posts which comment count is >= 2:

Post.where { comments >= 2 }

Between, dsl style, no strings attached:

Post.where { published_at.between(2.years.ago, 6.months.ago) }

Now querying a relationship count. No joins exposed:

Post.where(:comments).count.exists?

Coming next, greater and lesser than:

Post.where(:comments).count.gt(2)

Post.where(:comments).count.lt(2)

Like:

Post.where(:comments).description.like?("%filtered%")

Post.where(:comments).subject.like?("%filtered%")

Post.where(:user).name.like?("anderson")

Post.where(:comments).description.like?("%dsl test%")

Filter Example

Create dynamic filters with just one method.

<% form_tag :action => 'filter' do %>
  	Title: <%= text_field_tag 'post[title]' %><br />
  	Only with Comments? 
        <%= select("post", "comments",   options_for_select({ "false" => "", "true" => "true" })) %> %>

def filter
  @posts = Post.filtered_relation(params[:post]).all
end

You can filter out different and more advanced relations:

posts = Post.filtered_relation(:comments => true).where(:user_id => 4).limit(3).order("id ASC") 




posts.each do |post| 

	# records
end