field.js
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field.js
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	"use strict";
	const locreq = require("locreq")(__dirname);
	const default_methods = require("./field-type-default-methods.js");
	const FieldType = locreq("lib/chip-types/field-type.js");

	function Field(app, declaration, collection) {
	this.name = declaration.name;
	this.declaration = declaration;
	this.type = new FieldType(app, declaration.type);
	this.value_path = this.name + (this.type.value_path_after_field_name \|\| "");
	this.required = declaration.required \|\| false;
	this.params = declaration.params \|\| {};
	this.type.init(collection, declaration.name, this.params);

	const self = this;

	for (const method_name in default_methods) {
	this[method_name] = (function(method_name) {
	return function() {
	const arguments_array = Array.from(arguments);
	arguments_array.splice(1, 0, self.params);
	return self.type[method_name].apply(self.type, arguments_array);
	};
	})(method_name);
	}

	this.get_specification = function() {
	return {
	name: this.name,
	type: this.type,
	params: this.params,
	};
	};

	this.get_aggregation_stages = function(context, query_params) {
	return Promise.resolve(
	this.type.get_aggregation_stages(
	context,
	this.params,
	this.name,
	this.value_path,
	query_params
	)
	);
	};
	}

	module.exports = Field;