Posting string data into arrays from Rails views (forms)

Question

I've been trying to figure out how to post a string into an array from a user input text field that is part of a form. The push and << methods work fine over the console, but I couldn't manage to save any string data into arrays from my forms. It always reports a type mismatch like this:

Attribute was supposed to be a Array, but was a String.

What is the appropriate way to deal with this ?

EDIT code example:

the array:

serialize(:name, Array)

Let's say that the form contains just a simple text field, nothing else. How would I store the input data into the array above ? Basically what's the correct format of this piece of code:

<%= form_tag(grids_path , method: "post") do %>
    <table id="grid">
    <thead>
        <tr>
            <th>Name</th>
        </tr>
    </thead>

    <tbody>
        <tr>
            <td><%= text_field(:grid, :name) %></td>
        </tr>
    </tbody>

    </table>
    <%= submit_tag("Save") %>

<% end %>

Sorry, edited. The code is basically non-existant as I simply need to learn of a way to usually do this kind of thing. — lmatejic
– lmatejic, Commented Aug 19, 2015 at 10:16

Andrea Salicetti · Accepted Answer · 2015-08-19 10:41:19Z

2

If you simply want to store a param into and array, you should do something like this:

<%= text_field_tag 'grid[name][]' %>

then the params['grid']['name'] will contain an array of strings

edited Aug 19, 2015 at 10:41

answered Aug 19, 2015 at 10:19

Andrea Salicetti

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4 Comments

lmatejic Over a year ago

I want to store it from my form which is in the view.

lmatejic Over a year ago

It's in the post now.

lmatejic Over a year ago

Rails is not reporting errors anymore, it just seems that the data isn't being saved properly. But that's another issue unrelated to this I suppose. This is what I'm looking for then, thanks !

lmatejic Over a year ago

By the way, a quick question. What if I used form_for tag like this: <%= form_for(@grid) do |f| %> How would the syntax for the fields go then ?

Jay-Ar Polidario · Accepted Answer · 2015-08-19 10:33:34Z

0

In your view:

<%= text_field_tag :my_string_a, 'String A' %>
<%= text_field_tag :my_string_b, 'String B' %>

In your controller:

my_array_of_strings = []
my_array_of_strings << params[:my_string_a]
my_array_of_strings << params[:my_string_b]

puts my_array_of_strings

Hope this works.

edited Aug 19, 2015 at 10:33

answered Aug 19, 2015 at 10:27

Jay-Ar Polidario

6,60318 silver badges30 bronze badges

5 Comments

lmatejic Over a year ago

I'd like to store multiple strings into an array called :name, for example. The strings to be stored are from the form's text field.

lmatejic Over a year ago

Where in the controller should I put your code ? It reports this error: undefined local variable or method params' `

Jay-Ar Polidario Over a year ago

In your example <%= form_tag(grids_path , method: "post") do %>, you used grids_path. Therefore, I am assuming the controller is grids_controller, and the method is create. Therefore you could add these lines above inside def create

lmatejic Over a year ago

You guessed right, I'll try your code out definitely just to test it all out. Thanks !

Jay-Ar Polidario Over a year ago

No prob! Good luck! :)

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