I need to use g:link tag and will be sending parameters back to controller.  The problem is, Grails kept saying there is something illegal about the variables I used in the parameter department.  Until I dig out the reference guide, I found somewhere says:

${foo} expansions will NOT work in the params parameter (although they will work in the id parameter).

Why so? link to the solution.

Absolutely a big surprise from a beginner.  Well…

It doesn’t.  I got some kind of ‘struct’ type instead.  Again, digging Grails tag library didn’t help much.   The following link suggested how to read the value from date picker in the controller:

• params["foobar_year"] storing year
• params["foobar_month"] storing month
• params["foobar_day"] storing day

Here you go —note:

• foobar is the name of your datePicker object from the submitted form.
• must be encoded in double quote

I worked in software industry so I know this is pretty much a norm – lack of good document.  When I want to use the Grails mail plugin, the document says to configure it this way

grails {
mail {
host = “smtp.gmail.com”

way wrong! I kept trying different settings until I came across some info that used a different value for the top domain.  It should have been:

smtp {
mail {
host = “smtp.gmail.com”

#@!#$*(\ sigh ... couldn't complain enough...

So here I go, as I learned and solved the problem I encountered, I tried to blog these problems and solutions (if there is one)…