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Unique tare weight based on quantity issue


heliophobe

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Ok, I have a unique (i think) weight issue. Many of my products have a fixed weight (1x.25lbs=.25lbs and 2x.25=.5lbs)

 

I also sell live fish. Depending on the fish, you can fit several in the same bag. Therein lies my problem.

 

If I can fit 6 fish in a bag of water, the weight of the water is the same for 1 or 6 fish although the weight of the actual fish does increase per qty. The seventh fish means another bag of water and drastically changes the shipping from 6 to 7 fish.

 

Is there a tare weight per quantity contribution? I've searched like mad to find an existing solution and unfortunately don't have the necessary skills to create a contribution on my own unless someone can point me to a good tutorial...hehe.

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Is there a tare weight per quantity contribution?
I'm not aware of it, but haven't searched either. The shipping weight takes the $total_weight that is set in checkout_shipping and adds the tare. $total_weight gets its number from the class shopping_cart and if you follow the trail long enough you will find it is calculated by the function calculate in catalog/includes/classes/shopping_cart.php (starts around line 203 in an unmodified file).

 

In that function you will find the line:

		  $this->weight += ($qty * $products_weight);

I assume that you could work in code for your fish problem here. You could read in a file with comma separated products_id's (somewhere along the lines I posted in the SPPC thread). And if the (int)$prid is in that array you check what the quantity is and do your calculations else use the original line of code.

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best way is to modify whatever shipping module you are using and do a little maths.

 

the shipping price is :

 

(int)quantity / 6 * SHIPPING_PRICE_FOR_6

+

(quantity % 6) * INDIVIDUAL_FISH_SHIPPING_PRICE

 

if that doesn't make sense post the part of your shipping module that calculates the price and I can do it for you.

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thinking about it slightly more it would be better to do something like

 

$bag_weight = (int)ceil($quantity / 6) * TARE_WEIGHT;

$fish_weight = $quantity * FISH_WEIGHT;

 

and the total weight is obviously the sum.

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Thanks for the replies. I use multiple shipping modules. DHL, UPS and USPS.

 

Is there a way to add those fields to the actual product entry page, say below the item weight, that would add a quantity per bag and bag weight specific to that product?

 

Something like this can be entered when adding a product:

 

Weight: .10 lbs

Bag Weight: .75lbs

Qty/bag: 6

 

Have the code calc the number of bags required and add it to the product weight before it gets sent to UPS/USPS/DHL for a quote.

 

Basically my issue is the 6 fish is an example since all fish aren't the same size. it could be 3 or 10 fish in the same size bag. And i have different size shipping bags with different weights.

 

thanks again. I really need to learn how to do this myself...hehe.

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Is there a way to add those fields to the actual product entry page, say below the item weight, that would add a quantity per bag and bag weight specific to that product?
Sure you could do that, would be a good way to have all that stuff together. However, it would mean writing your own contribution because it is a fair amount of work and you seem to be the only one needing it.
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Thanks for the replies. I use multiple shipping modules. DHL, UPS and USPS.

 

Is there a way to add those fields to the actual product entry page, say below the item weight, that would add a quantity per bag and bag weight specific to that product?

 

Something like this can be entered when adding a product:

 

Weight: .10 lbs

Bag Weight: .75lbs

Qty/bag: 6

 

Have the code calc the number of bags required and add it to the product weight before it gets sent to UPS/USPS/DHL for a quote.

 

Basically my issue is the 6 fish is an example since all fish aren't the same size. it could be 3 or 10 fish in the same size bag. And i have different size shipping bags with different weights.

 

thanks again. I really need to learn how to do this myself...hehe.

 

place a code that calculates bag qty as bag_qty = int(fish_qty/6) and you will get the bag qty.Use this qty along with other products to come to the total shipping estimate.

 

Satish

Ask/Skype for Free osCommerce value addon/SEO suggestion tips for your site.

 

Check My About US For who am I and what My company does.

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Just from your replies I think I know where to put what code, just not how to add fields to a page or define the variables.

 

I'd be more than happy to write my own contribution. Guess I'll do a bit more research on that. Maybe rip apart a contribution that added a field to see how they did it.

 

Thanks all. I really do appreciate it. Sorry if the request for info annoyed you Janz. Wasn't meant to.

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Just from your replies I think I know where to put what code, just not how to add fields to a page or define the variables.
I think (from the description, haven't used this myself) you could use Product Extra Fields to add your two necessary fields to the database and admin/categories.php page. Make sure the quantity is an integer or a small integer and weight like the other weights in the database.

 

Then all that is left is add the code to the function calculate in includes/classes/shopping_cart.php. You would need to add those two fields to the sql query:

// products price
	$product_query = tep_db_query("select products_id, products_price, products_tax_class_id, products_weight, bag_quantity, bag_weight from " . TABLE_PRODUCTS . " where products_id = '" . (int)$products_id . "'");

Then use if else logic:

if (tep_not_null(product['bag_quantity']) && tep_not_null(product['bag_weight'] ) { 
do your thing 
} else { 
original code for weight
}

Sorry if the request for info annoyed you Janz. Wasn't meant to.
Sorry if you think I was annoyed, I wasn't. I guess I was trying to discourage you from asking me to code it for you :)
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I probably should have been more clear that I would have preferred pointers or a tutorial so I could deal with any future issues on my own and add contributions for others.

 

And I just found that product extra fields contribution not 5 minutes ago...LOL. Of course my server is being moved so I have to wait a couple hours till I can install everything.

 

I am not a programmer but I know enough to be dangerous and learn quickly. Everything you all have posted has taught me a lot believe it or not.

 

Thanks.

I truly appreciate it.

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