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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: filter}
).then(function(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.body[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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