Rails访问表字段中存储为JSON数据的字段

Question

I have table Employee with several columns. One of the column is a text field and some data is stored inside it in following format,

:last_working_day => nil,
:first_working_day => <some data>,
:reason_for_leave1 => nil

and so on. Above layout is just an example and not actual layout.

I need to access these values. I can access the field which contains these data but how to extract these as a key value pair?

Answer 1

You can start with this

f.split(',').inject({}) { |h, e| k, v = e.split('=>').map{ |s| s.strip}; v = nil if v == 'nil'; h[k[1..-1].to_sym] = v ; h }

where 'f' is the field you provided. And seriously, use HStore or at least store this as YAML or json. Rails can handle columns with data serialized as YAML automatically.