Scope-Filter

scope_filter is a filter- and search-library for ActiveRecord models using scopes.

You can define the filterable and sortable scopes and fields and filter records with the scope_filter method.

This lib is fully compatible with kaminari or will_paginate as it uses ActiveRecord scopes only.

add the following line to your Gemfile

gem 'scope_filter'

or install it via rubygems

gem install scope_filter

Include ScopeFilter::ActiveRecord in your model and define the filterable and sortable fields with the configure_scope_filter method.

You can configure the filter with the following methods:

• add_scope and add_scopes: makes scopes of your model searchable (pass a boolean argument at the end to define if the scopes expect a parameter, defaults to false)
• eq: equal comparator
• g, gt: greater and greater than comparator
• l, lt: less and less than comparator
• like, ilike: like and ilike than comparator
• null, not_null: is null and is not null than comparator
• sortable: fields the resultset may be sorted by

The first argument defines the name of the filter parameter. You can define arbitrary filter fields, i.e.:

config.like :firstname_ends_with, :field => 'firstname', :pattern => lambda { |v| "%#{v}" }

class Person < ActiveRecord::Base
  include ScopeFilter::ActiveRecord
  
  scope :dwarf,      where('age > ? AND height < ?', 16, 150)
  scope :bastard,    where('lastname IN (?)', %w(Snow Sand Rivers))
  scope :highborn,   where('lastname IN (?)', %w(Lannister Stark Targaryen Martell))
  scope :older_than, lambda { |age| where('age > ?', age) }
  scope :dead,       where('date_of_death IS NOT NULL')
  scope :dragon,     where('lastname = ?', 'Targaryen')
  
  configure_scope_filter do |config|
    config.add_scopes :dwarf, :bastard, :dead, :highborn
    config.add_scope  :older_than, true
    config.like       :firstname
    config.eq         :knight
    config.like       :firstname_ends_with, :field => 'firstname', :pattern => lambda { |v| "%#{v}" }
    config.null       :alive, :field => 'date_of_death'
    config.sortable   :lastname, :firstname
  end

end

use the scope_filter method to filter records, i.e.

Person.scope_filter(:highborn => true, :knight => true, :_sort => 'lastname_desc')

which will return all highborn knights ordered descending by lastname.

Or use the params hash:

Person.scope_filter(params[:filter])

Lars Kuhnt Copyright (c) 2011

Published under the MIT License.

See LICENSE for details.