Can't save array in Mongoid

Question

I have a has_many relationship with another object. Because of this, Mongoid creates an attribute titled item_ids as an Array so I can conveniently save numerous ids as an array. However, whenever I attempt to save a new array it never actually saves. In my rails console I run the following code.

1.9.3p385 :035 > miss.item_ids = [1,2,3]
 => [1, 2, 3] 

1.9.3p385 :036 > miss.save
[paperclip] Saving attachments.
 => true 

1.9.3p385 :037 > miss.item_ids
 => []

As you can see when I save the object it returns true. However when I return to check out the item_ids I'm returned an empty array. What am I doing wrong?

instead of checking it in your rails console, try checking in the database console, just to make sure =) — user745235
– user745235, Commented Mar 21, 2013 at 18:51

yogodoshi · Accepted Answer · 2013-03-22 05:33:56Z

3

'item_ids' isnt an attribute, is a method that runs some queries to return only the IDs of the relationed objects and appends them on an array.

When you do something like miss.item_ids = [1,2,3] you are basically creating that field on the document, as you are using Mongo, it will store anything for you.

answered Mar 22, 2013 at 5:33

yogodoshi

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Jason Prins · Accepted Answer · 2013-03-22 09:27:26Z

1

You are manually creating the relation. Try miss.items << item

Now miss.items should return an array of items

answered Mar 22, 2013 at 9:27

Jason Prins

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