PHP Fatal error: Allowed memory size

This definitely doesn't happen in my enviroment, could you specify the steps to reproduce it?

1. install this module (i used check from git).
2. add a fixed price coupon.
3. run drush cc all

macbook-de-pedro-cambra-2:commerce_coupon pcambra$ drush cc all

'all' cache was cleared                                               [success]

Same problem for me too. Seems that the call to entity_metadata_wrapper() in commerce_coupon_fixed_amount_commerce_price_component_type_info was causing a heavily recursive loop, with commerce_coupon_fixed_amount_commerce_price_component_type_info being called over and over again, resulting to a memory overflow on our system. Attached patch reworks to achieve the same thing, without using entity_metadata_wrapper().

Reminds me of the problem I had trying to do stuff that I really cant do in a commerce _info hook. #1509450: Unable to load current order from hook_commerce_checkout_page_info_alter

Not sure how it worked for you @pcambra, but perhaps there is a finite limit to the amount of looping that happens, which on your system wasn't an issue. Try chucking a dd statement at the top of commerce_coupon_fixed_amount_commerce_price_component_type_info and see how many times it gets called.

Not sure of the environment conditions as I've just installed a kickstart with coupon and can't reproduce this.

About the patch, I'd say that these are not quite the same.

  'coupon_code' => $coupon_wrapper->commerce_coupon_code->value(),
      'coupon_code' => $wrapper->coupon[LANGUAGE_NONE][0]['value'],

Maybe we could use something like this
$items = field_get_items('commerce_coupon', 'commerce_coupon_fixed', 'commerce_coupon_code');

Anyways let's see the feedback by jucallme

Just seen that field_get_items conflicts with entity and rules at this point, we can gather the info manually, but it would be a little less fancy :)

Yeah, there was an issue with the previous patch. I think this ons better.

Great, let's commit the code which is actually the same but without wrappers, thanks mrfelton & jucallme!

Also committed to commerce coupon percentage that shares this code atm.

Now both share the code in this patch, are you sure you've updated to the last git version?