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This gist explains how to use render or redirect_to for HTTP response

render and redirect_to



redirect_to '/', alert: 'this works'

flash.alert = 'works too'
redirect_to '/'


to pass parameter, do

render 'new', usecase: 'register'

Then in new.html.erb, you can access params[:usecase] and get 'register'

To flash with render

flash.alert = '...' ; render 'form'

render 'form', alert: 'Not working'

In erb, you can

<p style='color: red'><%=flash.alert %><p>
<p style='color: green'><%=alert %><p> # works too
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