Returns result
if result
is not an array, returns first element otherwise.
var fetchOne = require('koa-neo4j/postprocess').fetchOne;
app.defineAPI({
// ..
postProcess: fetchOne
// ..
});
Allows issuing an error if the result's length is zero, with the ability to specify an http error code.
Default http error code for this hook function is 404
.
var errorOnEmptyResult = require('koa-neo4j/postprocess').errorOnEmptyResult;
app.defineAPI({
// ..
postProcess: errorOnEmptyResult('query did not match any results', 500)
// ..
});
Executes a function on each element of the result, gathers return values as the new result.
var map = require('koa-neo4j/postprocess').map;
var errorOnEmptyResult = require('koa-neo4j/postprocess').errorOnEmptyResult;
app.defineAPI({
// ..
postProcess: [
errorOnEmptyResult('query did not match any results'),
map(function(element) {
return element.someValue;
})
]
// ..
});
Converts a procedure to a preProcess hook function, result would be assigned to params.<key>
where key is the name
you've supplied as the argument to convertToPreProcess
var convertToPreProcess = require('koa-neo4j/postprocess').convertToPreProcess;
var parseIds = require('koa-neo4j/preprocess').parseIds;
var getAuthorId = app.createProcedure({
// ...
postProcess: [
// ...
// we need to provide the key
convertToPreProcess('author_id'),
// becomes params.author_id
parseIds('author_id')
],
});
app.defineAPI({
// ...
preProcess: [
// ...
getAuthorId,
function(params) {
console.log(params.author_id);
// logs result of getAuthorId
return params;
}
// ...
],
// ...
})