Rails - Jun 2006 - Foreign Key Violation

I have a 3 tables.

Menus
Application_Roles
Menu_Roles

Menus table is having many-many relationship with Application_Roles 
table and is linked via join table, Menu_Roles.

I have 2 drop down in Menu_Roles view html.  The values of these 2 drop 
downs are populated using "select" from Menus and Application_Roles 
table.  I could see the id and the description populated in the drop 
down from these two tables.   But when I try to save it (i.e. create a 
record) to Menu_Roles table, I get foreign key violation with values 0, 
0 selected (error messages shows the value selected are 0 and 0).

any help is greatly appreciated.

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