Rails 3, add radio button with migration, how set a default to existing data?

Question

We used a migration to add a new field to our Posts table called new_choice:integer with :default => 1

On the edit form we made it a radio button with 3 choices A,B,C represented by values 1,2,3

When a NEW record is created, the "A" button will be selected by default.

However, when an already-existing record is edited, the current value is nil so NO radio button is selected.

Is there a way to have the erb form check a particular button (A/1) if the field value sis not the "valid" choices of 1,2,3?

Chuck Vose · Accepted Answer · 2011-02-04 16:43:52Z

3

This should work:

<%= f.radio_button :post, choice, :checked => @post.choice == choice ? true : false %>

edited Feb 4, 2011 at 16:43

Chuck Vose

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answered Feb 4, 2011 at 9:56

Syed Aslam

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1 Comment

jpw Over a year ago

that looks close... I think I need to tweak that, I dont think it handles the case I want which is IF the field value is nil then I need to choose one to be checked, otherwise the buttons matching the current value is checked (which happens automatically)... probably something like :checked => (pseudo code: true if field is nil OR if field = value, else false)

seeingidog · Accepted Answer · 2011-02-04 07:59:05Z

1

The last option in radio button method will set the default, selected value:

radio_button("post", "new_choice", "1")

answered Feb 4, 2011 at 7:59

seeingidog

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