Let's say that you have these fields in your form:
- login
- password
- repeat_password
- repeat_password_once_more (see the example below)
You need to see if login exists, if passwords exist and that they
match. Validation functions provided by erlyweb can't check if two
fields match or not.
I've started working on a more generic function that would allow
passing several rules to validate a field, several functions etc.
I'm not too good at programming *blush* but here's what the function
does so far:
validate(A, [{password, {'=', password_repeat}}])
%% [] if everything is ok
%% [[password, {not_equal, password_repeat}]]
% --------------------------------
% --------------------------------
validate(A, [{password, [{'=', password_repeat},
{'=', password_repeat_once_more}]
}])
%% [] if everything is ok
%% [[password, [{not_equal, password_repeat},
{not_equal, password_repeat_once_more}]]]
% --------------------------------
% --------------------------------
validate(A, [{password, [{'=', password_repeat},
{'=', password_repeat_once_more}]
}, {login}])
%% [] if everything is ok
%% [[password, [{not_equal, password_repeat},
{not_equal, password_repeat_once_more}]],
[login, absent]
]
What I want t achieve in the end is allowing passing such constructs
as rules:
- Functions
validate{A, [{FieldName, module:function/2}])
%% where function accepts A and FieldName
- Function and value to check against
validate(A, [{FieldName, {module:function/3, Value}}])
%% where function accepts A, FieldName and Value
- A slew of operators such as =, =/=, <, <=, >, >= to check against
other fields or values
validate(A, [{FieldName, {'=', FieldName2}}])
validate(A, [{FieldName, {'=', "some value"}}])
I'm attaching whatever I have so far to this message. It's a horrible,
horrible mess :) So far you can only validate against to rules:
validate(A, [{FieldName}]) %% if a field exists
validate(A, [{FieldName, {'=', FieldName2}}]) %% if a field equals
some other field
Of course, you re not limited to the number of fields or the number of
rules that are being passed in:
validate(A, [
{FieldName1},
{FieldName2, {'=', FieldName3}},
{FieldName4, [
{'=', FieldName3},
{'=', FieldName4},
{'=', FieldName5}
]},
]
)
I'll be glad to hear your input on this
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