an array is automatically stringified in rails with mongoid

Question

I'm new in using rails with mongoid and i have problems in storing an array in some field

Here is the code to clarify everything

in my model :

class Something
    include Mongoid::Document
    field :some_field, type: Array
end

in my controller :

def create
@something = Something.new(something_params)
    @something[:some_field] = params[:something][:some_field].split(',')
    if @something.save
        redirect_to @something, notice: "whatever"
    else
        render "new"
    end
end

in my view :

<%= form_for @something do |f| %>
    <div class="field">
        <%= f.label :some_field %><br>
        <%= f.text_area :some_field %>
    </div>
    <div class="actions">
        <%= f.submit %>
    </div>
<% end %>

when i use it that way i get an error message : "Problem: Value of type String cannot be written to a field of type Array Summary: Tried to set a value of type String to a field of type Array Resolution: Verify if the value to be set correspond to field definition"

but when i change the field type to String , it is successfully added but with a stringified array

I tried this :

render :text => @something[:some_field] #outputs : ["field1", "field2", "field3"]

but

render :text => @something[:some_field].inspect  #outputs : "[\"field1\", \"field2\", \"field3\"]"

What should i do to store the value as an Array ?

Thanks

Is it the Something.new(something_params) that is complaining? Presumably :some_field is a string in something_params, right? — mu is too short
– mu is too short, Commented Mar 12, 2014 at 20:12
yes , you are right ! .. but when can i split the :some_field so that it can be stored as an array ? — Ahmed Muhammad
– Ahmed Muhammad, Commented Mar 13, 2014 at 12:58
What format are you expecting people to type into the <textarea>? Some sort of CSV? — mu is too short
– mu is too short, Commented Mar 14, 2014 at 0:04
a normal text separated by commas .. that's why i'm trying to split it with split function — Ahmed Muhammad
– Ahmed Muhammad, Commented Mar 14, 2014 at 13:22

Ahmed Muhammad · Accepted Answer · 2014-03-17 11:54:26Z

1

I finally figured out what's wrong

I have to modify the hash value to be an array before calling

@something = Something.new(something_params)

so , i had to type this first :

@something[:some_field] = params[:something][:some_field].split(',')

The code that works is :

def create
    @something[:some_field] = params[:something][:some_field].split(',')
    @something = Something.new(something_params)
    if @something.save
        redirect_to @something, notice: "whatever"
    else
        render "new"
    end
end

answered Mar 17, 2014 at 11:54

Ahmed Muhammad

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1 Comment

d34th4ck3r Over a year ago

What version of Rails are you using?

aarti · Accepted Answer · 2014-03-14 19:10:02Z

0

Add .reject(&:blank?) after you split(","). I also use mongoid but with multi select. I changed my code to text_area and this code worked for me. Also an example http://funonrails.com/2012/01/mongoid-array-field-and-rails-form/

@something[:some_field]=params[:something][:some_field].split(',').reject(&:blank?)

edited Mar 14, 2014 at 19:10

answered Mar 13, 2014 at 23:50

aarti

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2 Comments

Ahmed Muhammad Over a year ago

@archie it is not assigned as an array anyway .. it is converted to a stringified array .. so , it is not about saving .. it is before saving ( i think )

aarti Over a year ago

You need to add reject(&:blank?) after you split array

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