Rails select helper - Default selected value how

Question

Here is a piece of code I m using now    lt    f select  project id   project select   gt    How to modify it to make its default value equal to to params  pid  when page is loaded

User · Answer

The problem with all of these answers is they set the field to the default value even if you're trying to edit your record.

You need to set the default to your existing value and then only set it to the actual default if you don't have a value. Like so:

f.select :field, options_for_select(value_array, f.object.field || default_value)

For anyone not familiar with f.object.field you always use f.object then add your field name to the end of that.

User · Answer

Rails 3 0 9  select options for select  value1  value2  value3   default

User · Answer

If try to print the f object  then you will see that there is f object that can be probed for getting the selected item  applicable for all rails version   2 3    logger warn  f   f object inspect      so  use the following script to get the proper selected option    selected   gt  f object your field

User · Answer

lt    f select  project id   project select   selected   gt  params  pid    gt

User · Answer

lt    f select  project id  options from collection for select  project select     gt

User · Answer

Try this        lt    f select  project id   project select   selected   gt  f object project id   gt

User · Answer

Mike Bethany s answer above worked to set a default value when a new record was being created and still have the value the user selected show in the edit form   However  I added a model validation and it would not let me submit the form   Here s what worked for me to have a model validation on the field and to show a default value as well as the value the user selected when in edit mode         lt div class  field  gt       lt    f label  project id   my project id   class   control-label    gt  lt br gt       lt   if  work new record    gt         lt    f select  project id  options for select    Yes   true     No   false    true       required  true  class   form-control    gt  lt br gt       lt   else   gt         lt    f select  project id  options for select    Yes   true     No   false     work project id       required  true  class   form-control    gt  lt br gt       lt   end   gt     lt  div gt    model validation    validates  project id  presence  true

User · Answer

Alternatively  you could set the  project id attribute in the controller  since the first argument of f select pulls that particular attribute

User · Answer

This should work for you  It just passes   value   gt  params  pid    to the html options variable    lt    f select  project id   project select        value   gt  params  pid      gt

User · Answer

I ve found solution and I found that I m pretty unexperienced in RoR   Inside the controller that manages view described above add this    work project id   params  pid  unless params  pid  nil

User · Answer

Its already explained  Will try to give an example   let the select list be  select list     eligible  1  ineligible  0     So the following code results in   lt    f select  to vote  select list   gt    lt select name  to vote  id  to vote  gt     lt option value  1  gt eligible lt  option gt     lt option value  0  gt ineligible lt  option gt   lt  select gt    So to make a option selected by default we have to use selected  value    lt    f select  to vote  select list  selected  select list can vote    1   0   gt    if can vote  returns true it sets selected  1 then the first value will be selected else second   select name  driver bca aw eligible   id  driver bca aw eligible  gt     lt option value  1  gt eligible lt  option gt     lt option selected  selected  value  0  gt ineligible lt  option gt   lt  select gt    if the select options are just a array list instead of hast then the selected will be just the value to be selected for example if   select list      eligible    ineligible      now the selected will just take    lt    f select  to vote  select list  selected   ineligible    gt

User · Answer

This should do it    lt    f select  project id   project select   selected   gt  params  pid    gt

User · Answer

Use the right attribute of the current instance  e g   work project id     lt    f select  project id  options for select       work project id    gt

User · Answer

I couldn t get this to work and found that I needed to add the  selected  html attribute not only to the correct  lt option gt  tag but also to the  lt select gt  tag  MDN s docs on the selected attribute of the select tag say      selected - Boolean attribute indicates that a specific option can be initially selected    That means the code should look like   f select  project id  options for select  project select  default val   html   selected  true

User · Answer

if params  pid  is a string  which if it came from a form  it is  you ll probably need to use    params  pid  to i     for the correct item to be selected in the select list

[ruby-on-rails] Rails select helper - Default selected value, how?

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