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_batch_action.js
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_batch_action.js
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"use strict";
const Promise = require("bluebird");
const locreq = require("locreq")(__dirname);
const ArrayCartesian = locreq("lib/utils/array-cartesian.js");
const PromiseIterateGenerator = locreq(
"lib/utils/promise-iterate-generator.js"
);
module.exports = function batch_action(app, context, params, callback) {
// callback is a function that will be called for each instance infered from the description, taking context and inferred body as arguments
const mode = params.mode || "batch"; // can be: "cartesian" or "batch";
if (mode === "batch") {
throw new Error("BATCH mode not implemented yet");
}
if (mode === "cartesian") {
const field_names = [];
const possible_field_values = [];
const to_await = [];
for (const i in params.sources) {
const source = params.sources[i];
if (source[0] === "literal") {
for (const field_name in source[1]) {
field_names.push(field_name);
possible_field_values.push([source[1][field_name]]);
}
} else if (source[0] === "collection_fields") {
const collection_name = source[1].collection;
const filter = source[1].filter || {};
const fields = source[1].fields || [];
const map_to = source[1].map_to;
const promise = app
.run_action(
context,
["collections", collection_name],
"show",
{ filter }
)
.then(function({ items: resources }) {
for (const i in map_to) {
const field_in_collection = fields[i];
const field_name = map_to[i];
field_names.push(field_name);
possible_field_values.push(
resources.map(resource => {
if (field_in_collection === "id") {
return resource.id;
} else {
return resource[field_in_collection];
}
})
);
}
});
to_await.push(promise);
}
}
return Promise.all(to_await).then(function() {
return PromiseIterateGenerator(
new ArrayCartesian(possible_field_values),
function(values) {
const body = {};
for (const i in field_names) {
body[field_names[i]] = values[i];
}
return callback(context, body);
}
);
});
}
};

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