I\'m pretty new to Rails, and i\'m trying to do a polymorphic HABTM relationship. The problem is that I have three models that I want to relate.
My NSManagedObject says Tag has 2 To-many relationships,says posts and children. And I let Xcode 4 to generate NSManagedObject subclass for it.But I find that only one relationship can return the co
I\'m trying to build an inventory system for the various servers and apps we have. I have the following tables/Models:
Does any body know how to write an XML from a Dataset that has multiple tables with multiple parent rows?
I would like to establish a many-to-many relationship with a constraint that only one or no entity from each side of the relationship can be linked at any one time.
I have a single table that has data like the following: Column 1 -- Column 2 A -- Z A -- Y B -- Y I am looking for a way in MySQL to roll up this data so that I get the following table that will
Bit of a newbie to Grails here. I have 2 domain objects linked with a hasMany relationship like so: class Accommodation
When I v开发者_如何学编程iew table \"Invoice Check Groupings\" in list or table model, all records from Invoice appear, not just those matching the global field \"Blank Invoice Check Grouping\"\'s val
Let\'s have a classes X and Y and relations between them x2y and y2x. From class_mapper(Class).iterate_properties iterator we can get all class\'s properties.
Background / Application I have two database tables, supplier and address with a one-to-one relationship, as not all suppliers have an address (and this is just a simplified example from a larger app