collection-field-subject.js
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collection-field-subject.js
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	"use strict";
	const locreq = require("locreq")(__dirname);
	const Promise = require("bluebird");
	const merge = require("merge");

	const Subject = locreq("lib/subject/subject.js");
	const Errors = locreq("lib/response/error.js");

	const CollectionFieldSubject = function(collection, resource_id, field_name){
	this.name = "CollectionFieldSubject";

	this.collection = collection;
	this.resource_id = resource_id;
	this.field_name = field_name;
	this.field_type = collection[field_name].type;
	};

	CollectionFieldSubject.prototype = Object.create(Subject.prototype);

	CollectionFieldSubject.prototype.perform_action = function(context, action_name, params){
	params = params \|\| {};
	merge(params, {
	resource_id: this.resource_id,
	field_name: this.field_name,
	collection: this.collection,
	});
	if (this.field_type.actions[action_name]){
	return Promise.resolve(this.field_type.actions[action_name](context, params));
	} else {
	throw new Errors.DeveloperError(`Unknown action: '${action_name}'`);
	}
	};

	CollectionFieldSubject.prototype.get_child_subject = function(key){
	const self = this;
	return Promise.try(function(){
	return self.field_type.get_child_subject(key);
	});
	};

	module.exports = CollectionFieldSubject;