i have two table, comment and post, both have composite keys, and no id
column, comment belongs to post, i follow the instruction of
http://compositekeys.rubyforge.org/, and it seems successfully,
(But i still cant confirm to put require 'rubygems' and
require 'composite_primary_keys' on which file ).
I can do the CRUD operation for post,then i want to create comment form,
in the _form.html.erb, the code likes below:
<%= form_for([@post, @post.comments.build]) do |f| %>
then i got an error,"unknown attribute: comment_id",
i think the build method need the parameter id which is default, but i
dont have this column,and i cant change any thing in the database,how to
resolve this problem?Thanks .

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  • Colin Law at Jan 5, 2012 at 9:46 am

    On 5 January 2012 02:53, Daisy Di wrote:
    i have two table, comment and post, both have composite keys, and no id
    column, comment belongs to post, i follow the instruction of
    http://compositekeys.rubyforge.org/, and it seems successfully,
    (But i still cant confirm to put require 'rubygems' and
    require 'composite_primary_keys' on which file ).
    I can do the CRUD operation for post,then i want to create comment form,
    in the _form.html.erb, the code likes below:
    <%= form_for([@post, @post.comments.build]) do |f| %>
    then i got an error,"unknown attribute: comment_id",
    i think the build method need the parameter id which is default, but i
    dont have this column,and i cant change any thing in the database,how to
    resolve this problem?Thanks .
    A way to resolve the problem is to stick to the rails conventions for
    id columns and so on. That is the best way unless you have a legacy
    database and *really* cannot change the schema.

    Colin

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  • Daisy Di at Jan 6, 2012 at 1:10 am

    Colin Law wrote in post #1039519:
    On 5 January 2012 02:53, Daisy Di wrote:
    dont have this column,and i cant change any thing in the database,how to
    resolve this problem?Thanks .
    A way to resolve the problem is to stick to the rails conventions for
    id columns and so on. That is the best way unless you have a legacy
    database and *really* cannot change the schema.

    Colin
    Hi Colin,
    i really have a legacy database and cant change anything......
    thanks very much

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  • Colin Law at Jan 6, 2012 at 8:04 am

    On 6 January 2012 01:10, Daisy Di wrote:
    Colin Law wrote in post #1039519:
    On 5 January 2012 02:53, Daisy Di wrote:
    dont have this column,and i cant change any thing in the database,how to
    resolve this problem?Thanks .
    A way to resolve the problem is to stick to the rails conventions for
    id columns and so on.  That is the best way unless you have a legacy
    database and *really* cannot change the schema.

    Colin
    Hi Colin,
    i really have a legacy database and cant change anything......
    thanks very much
    In that case some of the clever stuff in Rails may not be available to
    you, you may have to do them 'by hand' so to speak. I don't know
    whether there is a way of using build in the way you want in your
    circumstance. The alternative is just to create the object
    explicitly. I expect you have already googled for
    rails legacy database
    to get as far as you have.

    Colin

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postedJan 5, '12 at 2:53a
activeJan 6, '12 at 8:04a
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