I had real weird problem here.
If I use "joins" in find, both development and production environment
give right answers.
But, when I use "include" in find, the development environment goes
all right. However, the find method fails in production enviroment.
Let me describe this in detail.
I have two tables.
###### table 1: companies ##########
id int
.....
###### table 2: sections ##########
id int
ref_company_id int
ref_meta_id int
....
A company will have one section, and a section may have sub-sections.
when ref_meta_id is 0, the section is the main section of a company
whose id is ref_company_id.
when ref_meta_id is not 0, the section is a sub-section of a company
whose id is ref_company_id.
And here are the two models
# class Company < ActiveRecord
# has_one :main-
section, :class=>"Section", :foreign_key=>"ref_company_id",
:conditions=>"ref_meta_id=0"
# has_many :all-
sections, :class=>"Section", :foreign_key=>"ref_company_id"
# end
# class Section < ActiveRecord
#
belongs_to :company, :class=>"Company", :foreign_key=>"ref_company_id"
# end
All these things are good in both development and production
environment.
# Company.find(1).main-section
# Company.find(1).all-sections
# Section.find(1).company
Now comes to the find method used in controller.
First use joins, as I said before, the following methods went well in
both development and production enviroment.
# Company.find(:all, :select=>'companies.*', :joins=>[:all-
sections], :conditions=>"companies.id<500")
# Company.find(:all, :select=>'companies.*', :joins=>[:all-
sections], :conditions=>"sections.id<500")
Then use include,
# Company.find(:all, :select=>'companies.*', :joins=>[:all-
sections], :conditions=>"companies.id<500")
this went well in both development and production enviroment.
However,
# Company.find(:all, :select=>'companies.*', :joins=>[:all-
sections], :conditions=>"sections.id<500")
this went well in development environment, but in production
environment, I get this error.
*********************************************************************
Unknown column 'companies.ref_company_id' in 'field list':
SELECT `companies`.`id` AS t0_r0,
`companies`.`ref_company_id` AS t0_r16,
`companies`.`ref_meta_id` AS t0_r17,
`sections`.`id` AS t1_r0,
`sections`.`ref_company_id` AS t1_r1,
`sections`.`ref_meta_id` AS t1_r2,
FROM `companies` LEFT OUTER JOIN `sections` ON
sections.ref_meta_id = companies.id
WHERE ( sections.id<500 )
**********************************************************************
And this is definetely a wrong SQL statement
Can anybody explain this?
And Can anybody please explain what is the difference between include
and join?
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