CODEWITHSUNDEEP
rubysinatradatamapper
Adam
Adam

Reputation: 495

Table column names to array in ruby

In Rails I would simply use:

MyModel.column_names

to access the tables column names, but I am enduring my first fumblings with Sinatra (in order to better learn Ruby) and need to get the column names of a table into an array.

Previously, I have iterated over the params hash to extract key, value pairs:

params.each do |key, value|
  #manipulate keys and values
end

and know that using:

@mm = MyModel.new
@mm.each do ....

leads to an undefined method 'each' error.

logger.info @mm.inspect

logs something like:

#<MyModel @id=nil @start=nil @end=nil @yada=nil @created_at=nil @updated_at=nil @foreign_id=nil>

So, how do I get those blasted column names I can see so clearly into an array?

Thanks...

UPDATE

Thanks to Doon for pointing me in the right direction with Datamapper properties.

I ended up making a private method column_names:

def self.column_names
  self.properties.collect {|column| column.name.to_s }
end

which works a treat

Upvotes: 1

Views: 520

Answers (2)

Doon
Doon

Reputation: 20232

Are you looking for properties ?

http://rubydoc.info/gems/dm-core/1.1.0/DataMapper/Model/Property

Upvotes: 2

Arthur Reutenauer
Arthur Reutenauer

Reputation: 2632

For any Ruby object you have the methods instance_variables that returns the array of that object’s attributes. Is that too generic for you? I’m not familiar with DataMapper, there may be a specific method to do the equivalent of column_names in ActiveRecord.

Upvotes: 0

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