markjlorenz/Query String to Params Cheat.md

## Query String to Params Cheat.md

      
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              Query String to Params Cheat.md
            
          
    #A hash of arrays:
widget[]=first-widget&gadget[]=a-gadget&widget[]=another%20widget
Resulting Params:
{
    :widget => [ "first-widget",  "another widget"],
    :gadget => [ "a-gadget" ]
}

#An array of hashes:
follows[][screen_name]=soodesune&follows[][presentation_id]=4&follows[][verify]=6ae9f180f13108&follows[][screen_name]=radiouman&follows[][presentation_id]=5&follows[][verify]=6ae9f180f13238
Resulting Params:
{
    follows:[
        {screen_name:"soodesune", presentation_id:"4", verify:"6ae9f180f13108"}, 
        {screen_name:"radiouman", presentation_id:"5", verify:"6ae9f180f13238"}
    ]
}


Note that with Express.js/Connect's bodyParser this would need to have the form follows[1][screen_name]=soodesune...

#A complex example:
HTML:
<form action="forms/1802">
    <input name="form[form_drugs_attributes][0][_destroy]" type="checkbox" value="1">
    <input name="form[form_drugs_attributes][0][id]" type="hidden" value="200358">
    <input name="form[form_drugs_attributes][1][_destroy]" type="checkbox" value="1"> <!-- this one is checked -->
    <input name="form[form_drugs_attributes][1][id]" type="hidden" value="200359">
</form>

Sends:
{"utf8"=>"✓", "authenticity_token"=>"B6...WQ=", "form"=>{"form_drugs_attributes"=>{"0"=>{"_destroy"=>"0", "id"=>"200358"}, "1"=>{"_destroy"=>"0", "id"=>"200359"}}}, "commit"=>"Submit", "id"=>"18028"}
The integer to indicate an array doesn't carry any significance outside of telling the params parser to put substrings with the same array number in to one object.  It's not the #id in the database.
Or see the docs