如何使用Rails序列化字段中存储的数据

Question

I have the User.guided field set to serialized in my user.rb file:

serialize :guided

In the DB the values are being stored like so:

--- "{\"step1\"=>\"true\", \"step2\"=>\"false\"}"

So on my rails view I output the values to JS as so:

<script>
var guided = <%= current_user.guided.to_json.html_safe %>;
</script>

Then in the js console, guided outputs:

"{"step1"=>"true", "step2"=>"false"}"

Problem is I can't access the individual values? How do you do that?

As guided.step1 errors with undefined

Thanks

Answer 1

to_json returns a JSON string. You should parse that string on the client to get the actual object.

For example:

var guided = JSON.parse(<%= current_user.guided.to_json.html_safe %>);

Also, your code doesn't return actual JSON string, but rather string with ruby hash syntax. There's probably more going on there than you show us. This code works:

obj = {"step1"=>"true", "step2"=>"false"}
obj # => {"step1"=>"true", "step2"=>"false"}
obj.to_json # => "{\"step1\":\"true\",\"step2\":\"false\"}"