Class | DBI::ColumnInfo |
In: |
lib/dbi/columninfo.rb
|
Parent: | DelegateClass(Hash) |
This represents metadata for columns within a given table, such as the data type, whether or not the the column is a primary key, etc.
ColumnInfo is a delegate of Hash, but represents its keys indifferently, coercing all strings to symbols. It also has ostruct-like features, f.e.:
h = ColumnInfo.new({ "foo" => "bar" }) h[:foo] => "bar" h["foo"] => "bar" h.foo => "bar"
All of these forms have assignment forms as well.
Create a new ColumnInfo object.
If no Hash is provided, one will be created for you. The hash will be shallow cloned for storage inside the object, and an attempt will be made to convert all string keys to symbols.
In the event that both string and symbol keys are provided in the initial hash, we cannot safely route around collisions and therefore a TypeError is raised.
# File lib/dbi/columninfo.rb, line 31 def initialize(hash=nil) @hash = hash.dup rescue nil @hash ||= Hash.new # coerce all strings to symbols @hash.keys.each do |x| if x.kind_of? String sym = x.to_sym if @hash.has_key? sym raise ::TypeError, "#{self.class.name} may construct from a hash keyed with strings or symbols, but not both" end @hash[sym] = @hash[x] @hash.delete(x) end end super(@hash) end
# File lib/dbi/columninfo.rb, line 59 def default() # :nodoc; XXX hack to get around Hash#default method_missing(:default) end