Refactor introspection to ModelBuilder

examples/app-noschema.js

@@ -1,6 +1,6 @@
 var DataSource = require('../../loopback-datasource-juggler').DataSource;
 var ModelBuilder = require('../../loopback-datasource-juggler').ModelBuilder;
-var introspectType = require('../lib/introspection');
+var introspectType = require('../lib/introspection')(ModelBuilder);
 
 var ds = new DataSource('memory');
 

lib/introspection.js

@@ -1,59 +1,60 @@
-var ModelBuilder = require('./model-builder').ModelBuilder;
+module.exports = function getIntrospector(ModelBuilder) {
 
-function introspectType(value) {
+    function introspectType(value) {
 
-    // Unknown type, using Any
-    if (value === null || value === undefined) {
-        return ModelBuilder.Any;
-    }
-
-    // Check registered schemaTypes
-    for (var t in ModelBuilder.schemaTypes) {
-        var st = ModelBuilder.schemaTypes[t];
-        if (st !== Object && st !== Array && (value instanceof st)) {
-            return t;
+        // Unknown type, using Any
+        if (value === null || value === undefined) {
+            return ModelBuilder.Any;
         }
-    }
 
-    var type = typeof value;
-    if (type === 'string' || type === 'number' || type === 'boolean') {
-        return type;
-    }
-
-    if (value instanceof Date) {
-        return 'date';
-    }
-
-    if (Array.isArray(value)) {
-        for (var i = 0; i < value.length; i++) {
-            if (value[i] === null || value[i] === undefined) {
-                continue;
+        // Check registered schemaTypes
+        for (var t in ModelBuilder.schemaTypes) {
+            var st = ModelBuilder.schemaTypes[t];
+            if (st !== Object && st !== Array && (value instanceof st)) {
+                return t;
             }
-            var itemType = introspectType(value[i]);
+        }
+
+        var type = typeof value;
+        if (type === 'string' || type === 'number' || type === 'boolean') {
+            return type;
+        }
+
+        if (value instanceof Date) {
+            return 'date';
+        }
+
+        if (Array.isArray(value)) {
+            for (var i = 0; i < value.length; i++) {
+                if (value[i] === null || value[i] === undefined) {
+                    continue;
+                }
+                var itemType = introspectType(value[i]);
+                if (itemType) {
+                    return [itemType];
+                }
+            }
+            return 'array';
+        }
+
+        if (type === 'function') {
+            return value.constructor.name;
+        }
+
+        var properties = {};
+        for (var p in value) {
+            var itemType = introspectType(value[p]);
             if (itemType) {
-                return [itemType];
+                properties[p] = itemType;
             }
         }
-        return 'array';
-    }
-
-    if (type === 'function') {
-        return value.constructor.name;
-    }
-
-    var properties = {};
-    for (var p in value) {
-        var itemType = introspectType(value[p]);
-        if (itemType) {
-            properties[p] = itemType;
+        if (Object.keys(properties).length === 0) {
+            return 'object';
         }
+        return properties;
     }
-    if(Object.keys(properties).length === 0) {
-        return 'object';
-    }
-    return properties;
+
+    return introspectType;
 }
 
-module.exports = introspectType;
-
 

lib/model-builder.js

@@ -8,6 +8,11 @@ var List = require('./list.js');
 var EventEmitter = require('events').EventEmitter;
 var util = require('util');
 
+// Set up types
+require('./types')(ModelBuilder);
+
+var introspect = require('./introspection')(ModelBuilder);
+
 /**
  * Export public API
  */
@@ -31,9 +36,6 @@ function ModelBuilder() {
 
 util.inherits(ModelBuilder, EventEmitter);
 
-// Set up types
-require('./types')(ModelBuilder);
-
 /**
  * Define class
  *
@@ -516,5 +518,21 @@ ModelBuilder.prototype.buildModels = function (schemas) {
     return models;
 }
 
+/**
+ * Introspect the json document to build a corresponding model
+ * @param name
+ * @param json
+ * @param options
+ * @returns {}
+ */
+ModelBuilder.prototype.buildModelFromInstance = function(name, json, options) {
+
+    // Introspect the JSON document to generate a schema
+    var schema = introspect(json);
+
+    // Create a model for the generated schema
+    return this.define(name, schema, options);
+}
+
 
 

test/introspection.test.js

@@ -1,6 +1,6 @@
 var assert = require('assert');
 var ModelBuilder = require('../lib/model-builder').ModelBuilder;
-var introspectType = require('../lib/introspection');
+var introspectType = require('../lib/introspection')(ModelBuilder);
 var traverse = require('traverse');
 
 describe('Introspection of model definitions from JSON', function() {