How to query rails way ? Rails 3.2 - mysql

Question

List of relationship between models:
class ErrorScope < ActiveRecord::Base
belongs_to :server
has_many :scope_to_fixflow_map
attr_accessible :id, :server_id, :error_codes, :scoping_method, :priority, :error_codes_is_wildcard_match
serialize :error_codes
.....
end
class ScopeToFixflowMap < ActiveRecord::Base
belongs_to :error_scope
attr_accessible :id, :server_id, :error_scope_id, :path, :fixflow_class_name
......
end
class Server < ActiveRecord::Base
has_many :error_scopes
......
end
schema.rb
create_table "error_scopes", :force => true do |t|
t.integer "server_id", :limit => 8, :null => false
t.text "error_codes", :null => false
t.text "scoping_method"
t.integer "priority", :null => false
t.boolean "error_codes_is_wildcard_match", :default => false
end
create_table "scope_to_fixflow_maps", :force => true do |t|
t.integer "server_id", :limit => 8, :null => false
t.integer "error_scope_id", :limit => 8, :null => false
t.string "path"
t.string "fixflow_class_name", :null => false
end
Now i have a sql query which gives me desired output:
SELECT fixflow_class_name
FROM error_scopes s
join scope_to_fixflow_maps m on s.id=m.error_scope_id
join servers serv on serv.id=s.server_id
where error_codes regexp 'error_scope_test'
and path = 'x'
and assettag = 'y'
What I tried so far. It works
ErrorScope.where("error_codes like ?", "%error_scope_test\n%").select {|tag| tag.server.assettag == "y"}[0].scope_to_fixflow_map.select {|y| y.path == "x"}[0].fixflow_class_name
using joins
ErrorScope.joins(:server, :scope_to_fixflow_map).where("error_codes LIKE ?", "%error_scope_test%").select {|tag| tag.server.assettag == "y"}[0].scope_to_fixflow_map.select {|y| y.path == "x"}[0].fixflow_class_name
I am sure there must be better way to do this query??

Answer 1

Something like this:
ErrorScope.joins(:server, :scope_to_fixflow_map)
.where("error_codes LIKE ?", "%error_scope_test%")
.where("servers.assettag='y'")
.where("scope_to_fixflow_maps.path='x'")
.select("scope_to_fixflow_maps.fixflow_class_name")

Answer 2

Not the rails way but quick and dirty:
ActiveRecord::Base.execute("SELECT fixflow_class_name
FROM error_scopes s
join scope_to_fixflow_maps m on s.id=m.error_scope_id
join servers serv on serv.id=s.server_id
where error_codes regexp 'error_scope_test'
and path = 'x'
and assettag = 'y'")
Returns back an array of hashes that you can work with