How do I DRY up my CouchDB views?
- by James A. Rosen
What can I do to share code among views in CouchDB?
Example 1 -- utility methods
Jesse Hallett has some good utility methods, including
function dot(attr) {
return function(obj) {
return obj[attr];
}
}
Array.prototype.map = function(func) {
var i, r = [],
for (i = 0; i < this.length; i += 1) {
r[i] = func(this[i]);
}
return r;
};
...
Where can I put this code so every view can access it?
Example 2 -- constants
Similarly for constants I use in my application. Where do I put
MyApp = {
A_CONSTANT = "...";
ANOTHER_CONSTANT = "...";
};
Example 3 -- filter of a filter:
What if I want a one view that filters by "is this a rich person?":
function(doc) {
if (doc.type == 'person' && doc.net_worth > 1000000) {
emit(doc.id, doc);
}
}
and another that indexes by last name:
function(doc) {
if (doc.last_name) {
emit(doc.last_name, doc);
}
}
How can I combine them into a "rich people by last name" view?
I sort of want the equivalent of the Ruby
my_array.select { |x| x.person? }.select { |x| x.net_worth > 1,000,000 }.map { |x| [x.last_name, x] }
How can I be DRYer?
