take an array of attributes to make a hash of only those attributes

Question

I have an Item class with many attributes but for this case lets say it has a name, detail, inventory_count, price on it. in These are all ruby primitives.

I would like to get back a hash of like 'name' and 'detail' such that:

vals=%[name detail] item=Item.find(23) # somethign like??? g={} vals.map { |atr| g[atr]=item.??? }

or some other technique. How would I take a string representation and get the attribute of an instance? Is there an easier / better way to do this?

edit 1

looks like send might do it. Let me check

Tom Gasaner · Accepted Answer · 2015-09-04 20:18:21Z

2

#attributes returns an object in hash representation, #slice returns a hash containing only the given keys, so:

item.attributes.slice('name', 'detail')

answered Sep 4, 2015 at 20:18

Tom Gasaner

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2 Comments

timpone Over a year ago

cool - how would I pass an array of desired attributes into slice()?

Tom Gasaner Over a year ago

@timpone just unpack array like this: item.attributes.slice(*array)

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