Created
February 25, 2009 21:35
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# Put this in an initializer (config/initializers/common_scopes.rb) or library file. | |
# | |
module CommonScopes | |
module ClassMethods | |
# Sort given fields ASC or DESC | |
# | |
# Example: | |
# | |
# class Post < ActiveRecord::Base | |
# extend CommonAr::ClassMethods | |
# | |
# sortable_with :title => 'The title', :created_at => 'Created on' | |
# end | |
# | |
# Now you can sort with: | |
# 'title_asc' | |
# 'title_desc' | |
# 'created_at_asc' | |
# 'created_at_desc' | |
# | |
# @posts = Post.sort_with(params[:sort]).paginate(:page => params[:page]) | |
# | |
# Post.sortable_fields gives you param and human names you can use in your GUI | |
# Post.sortable_fields #=> {:title_asc => 'The title', :created_at => 'Created on'} | |
# | |
def sortable_with(fields = {}) | |
sorts = fields.inject({}) do |h,f| | |
h[:"#{f.first}_asc"] = "#{f.last} a-z" | |
h[:"#{f.first}_desc"] = "#{f.last} z-a" | |
h | |
end | |
write_inheritable_attribute(:sortable_fields,sorts) | |
class_inheritable_reader :sortable_fields | |
named_scope :sort_with, lambda { |*args| | |
return {} if args.compact.blank? | |
k = args.first.to_sym | |
return {} if !sortable_fields.has_key?(k) | |
{:order => k.to_s.sub('_desc',' desc').sub('_asc',' asc')} # who has time to learn proper RegEx | |
} | |
end | |
# Search given fields with SQL LIKE | |
# | |
# Example: | |
# | |
# class Post < ActiveRecord::Base | |
# extend CommonAr::ClassMethods | |
# | |
# likeable_with :title, :body | |
# end | |
# | |
# Now your LIKE queries will look in title and body | |
# You can combine scopes. | |
# | |
# @posts = Post.sort_with(params[:sort]).like(params[:q]).paginate(:page => params[:page]) | |
# | |
def likeable_with(*fields) | |
# TODO: validate that schema has these fields | |
named_scope :like, lambda {|q| | |
return {} if q.blank? || !q.respond_to?(:to_s) | |
t = ActiveRecord::Base.connection.quote("%#{q}%") | |
conditions = fields.collect{|f| "#{f} LIKE #{t}" }.join(' OR ') | |
{:conditions => conditions} | |
} | |
end | |
end | |
end |
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