Hello forum readers,
Let''s say i have two models: Person and Role (i replicated the problem
with Post & Tag as well, as i thought the problem was linked to some
application-specific rights problem, but it wasn''t).
In Person, attr_accessible role_ids is declared, so it accepts an array
of Role ids as an argument when creating / updating.
If i fire up the rails console and just do:
[code]
Person.first.role_ids = [1, 2, 3]
[/code]
Everything works so far.
Now from the web browser, when trying to update a specific person, i
get:
[code]
Started PUT "/people/1?_dc=1351904653950" for 127.0.0.1 at 2012-11-02
18:04:13 -0700
Processing by PeopleController#update as JSON
Parameters:
{"email"=>"jdoe-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org",
"last_name"=>"DOE",
"first_name"=>"John", "company_id"=>1,
"created_at"=>"2012-11-02T22:27:00Z",
"updated_at"=>"2012-11-02T22:27:00Z",
"role_ids"=>[2, 1], "id"=>"1",
"_dc"=>"1351904653950",
"person"=>{"email"=>"jdoe-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org",
"first_name"=>"John",
"last_name"=>"DOE", "role_ids"=>[2, 1]}}
WARNING: Can''t verify CSRF token authenticity
Person Load (0.2ms) SELECT "people".* FROM "people" WHERE
"people"."email" =
''jdoe-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org'' LIMIT 1
Role Load (0.1ms) SELECT "roles".* FROM "roles" INNER
JOIN
"people_roles" ON "roles"."id" =
"people_roles"."role_id" WHERE
"people_roles"."person_id" = 1
ModelRight Load (0.1ms) SELECT "model_rights".* FROM
"model_rights"
WHERE "model_rights"."role_id" IN (2, 1, 3)
Company Load (4.5ms) SELECT "companies".* FROM
"companies" WHERE
"companies"."id" = ? LIMIT 1 [["id", 1]]
Person Load (0.2ms) SELECT "people".* FROM "people" WHERE
"people"."company_id" = 1 AND
"people"."id" = ? LIMIT 1 [["id", "1"]]
(0.1ms) begin transaction
(0.0ms) rollback transaction
Completed 500 Internal Server Error in 2790ms
NoMethodError (undefined method `type_cast'' for nil:NilClass):
app/controllers/people_controller.rb:21:in `update''
[/code]
I scratched my head for quite a long time before finding out that after
restarting the rails server, the error would disappear and the Person
would actually be updated...
So with the help of pry and pry-debugger, i have pinpointed the exact
source of the "NoMethodError" error (in collection_association.rb, at
line 69):
[code]
# Implements the ids writer method, e.g. foo.item_ids= for
Foo.has_many :items
def ids_writer(ids)
pk_column = reflection.primary_key_column
ids = Array.wrap(ids).reject { |id| id.blank? }
ids.map! { |i| pk_column.type_cast(i) }
replace(klass.find(ids).index_by { |r| r.id }.values_at(*ids))
end
[/code]
This method gets called by the People controller in the update action
(@person.update_attributes params[:person]), which in turn deeper in
Rail''s guts arrive to the pinpointed method when accessing an *_ids
writer...
What is very weird, is that pk_column is nil (Hence the NoMethodError
error later), but when restarting the server and trying to output
pk_column, then it is a valid association column... Random behavior,
basically.
Is there anyone who would help me to understand what i''m doing wrong?
Is
a *_ids writer field any different in an HABTM assotiation compared to a
regular HM association?
Thank you for your help!
Best,
Pierre.
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