ashok
Value change in html template from 1200 to 1.2e3
I am fetching “card_income” value from the database (Postgres SQL) has its value as 1200.0 but in the phoenix view template it is showing the value as 1.2e3. What can be the reason? One interesting thing is if I update the value to 1120.0 it shows the same digits as in database that is 1120.0 but why not in case of 1200.0
//My incomecards.html.eex contains the code like
<%= for card ← @cards do %>
$<%= card.card_income %>
<% end %>
Marked As Solved
hauleth
These are the same values but with different representation. If you want to display data with “your” format then you need to format it properly. The simples way to achieve that is to use :io_lib.format/2 function:
<%= for card <- @cards do %>
$<%= :io_lib.format("~.2f", [card.card_income]) %>
<% end %>
Alternatively you can use ExCLDR.Numbers library that will allow you to format data with proper locale.
Also Liked
kip
I think there are a couple of things to think about:
- It looks like you’re dealing with money. Its not a good idea to use floats to represent money. There are lots of well-known issues. It would be much better to use decimals. There are a few money libraries around that can help.
- If indeed you are working with money then I think you should consider
nilan invalid value. The balance is0or some other value. I thinkio_lib.format/2is doing the right thing.
hauleth
:io_lib.format/2 works only with basic types, it has no knowledge how to format Elixir structures, especially when you want to format map as a float. However as you store them as decimals then you do not need formatting at all and plain card.card_income should work.
OvermindDL1
I feel summoned… ^.^
Never ever ever ever represent money as floats, never ever ever ever EVER.
There are some good money libraries for elixir that will handle money properly, just never ever ever ever store money as a float.
Now as for this issue, even changing it to decimal is still not ‘quite’ right as you lose information about the value, like what type it is and thus how it should be formatted.
If this is indeed money, use a money library, it will format it properly and all.
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