Changes for page Your First Rest Project

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• Page properties (2 modified, 0 added, 0 removed)

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Page properties

Author

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1		-XWiki.filippolauria
	1	+XWiki.skcodes

Content

...	...	@@ -1,7 +1,5 @@
	1	+{{toc}}{{/toc}}
1	1
2		-
3		-{{toc/}}
4		-
5	5	= Introduction =
6	6
7	7	In the first part of the Blog tutorial, you will learn:
...	...	@@ -12,7 +12,7 @@
12	12
13	13	= Create a new project =
14	14
15		-You will need to create a new project for this tutorial. In Eclipse, open the **File** menu, select **New** and select **Wonder REST Application** (or **ERRest Application**, according to //your// WOLips version). Name your project as //BlogRest//.
	13	+You will need to create a new project for this tutorial. In Eclipse, open the **File** menu, select **New** and select **Wonder REST Application**. Name your project as //BlogRest//.
16	16
17	17	= Create the database model =
18	18
...	...	@@ -22,93 +22,21 @@
22	22
23	23	BlogEntry will have the following columns:
24	24
25		-|=(((
26		-Column name
27		-)))|=(((
28		-Type
29		-)))|=(((
30		-Constraints
31		-)))
32		-|(((
33		-id
34		-)))|(((
35		-integer
36		-)))|(((
37		-primary key
38		-)))
39		-|(((
40		-title
41		-)))|(((
42		-string(255)
43		-)))|(((
44		-
45		-)))
46		-|(((
47		-content
48		-)))|(((
49		-string(4000)
50		-)))|(((
51		-
52		-)))
53		-|(((
54		-creationDate
55		-)))|(((
56		-timestamp
57		-)))|(((
58		-
59		-)))
60		-|(((
61		-lastModified
62		-)))|(((
63		-timestamp
64		-)))|(((
65		-
66		-)))
67		-|(((
68		-author
69		-)))|(((
70		-integer
71		-)))|(((
72		-relation with Author
73		-)))
	23	+|= Column name |= Type |= Constraints
	24	+| id | integer | primary key
	25	+| title | string(255) |
	26	+| content | string(4000) |
	27	+| creationDate | timestamp |
	28	+| lastModified | timestamp |
	29	+| author | integer | relation with Author
74	74
75	75	Author will have the following columns:
76	76
77		-|=(((
78		-Column name
79		-)))|=(((
80		-Type
81		-)))|=(((
82		-Constraints
83		-)))
84		-|(((
85		-id
86		-)))|(((
87		-integer
88		-)))|(((
89		-primary key
90		-)))
91		-|(((
92		-firstName
93		-)))|(((
94		-string(50)
95		-)))|(((
96		-
97		-)))
98		-|(((
99		-lastName
100		-)))|(((
101		-string(50)
102		-)))|(((
103		-
104		-)))
105		-|(((
106		-email
107		-)))|(((
108		-string(100)
109		-)))|(((
110		-unique
111		-)))
	33	+|= Column name |= Type |= Constraints
	34	+| id | integer | primary key
	35	+| firstName | string(50) |
	36	+| lastName | string(50) |
	37	+| email | string(100) | unique
112	112
113	113	== Creating the EOModel ==
114	114
...	...	@@ -116,34 +116,16 @@
116	116
117	117	An EOModel consists of entities, attributes and relationships. When using it in a RDBMS context, an entity is a table (or a view), an attribute is a table column and a relationship is a join between two tables.
118	118
119		-To create the EOModel, in the project right-click on the project name and select **New** -> **EOModel**.
	45	+To create the EOModel, in the project right-click on the project name and select **New** > **EOModel**.
120	120
121	121	Name it **BlogModel** and in the plugin list, select **H2**. Click **Finish**.
122	122
123	123	The model should show up in a window that looks like this:
124	124
125		-[[image:attach:EOModeler.png]]
126		-
127	127	If it didn't show up, the window might have opened behind the main Eclipse window. If that's the case, open the **Window** menu and select the windows that have //Entity Modeler// in its name.
128	128
129		-In the Entity Modeler window, click on **Default**, and for the **URL** field, type
	53	+In the Entity Modeler window, click on **Default**, and for the **URL** field, type {{code}}jdbc:h2:~/BlogTutorial{{/code}}. When the database will be created, it will be stored in your home directory (/Users/youruser/ on OS X).
130	130
131		-{{code}}
132		-jdbc:h2:~/BlogTutorial
133		-{{/code}}
134		-
135		-. When the database will be created, it will be stored in your home directory (/Users/youruser/ on OS X).
136		-
137		-You can also specify an absolute path where to store in you h2 database files. For example on Windows OS **URL** field can be like this:
138		-
139		-{{code}}
140		-jdbc:h2:C:/Users/ ... /BlogTutorial
141		-{{/code}}
142		-
143		-//Notice, in the path, *nix like file separator "/" instead of Windows like// "\" (as you can read [[here>>url:http://www.h2database.com/html/faq.html||shape="rect"]]).
144		-
145		-
146		-
147	147	Now, right-click on **BlogModel** and select **New Entity**.
148	148
149	149	Type the following details in the **Basic** tab:
...	...	@@ -164,97 +164,36 @@
164	164
165	165	Now, repeat the last two steps to create the other attributes for the **BlogEntry** entity, with the following values:
166	166
167		-|=(((
168		-Attribute name
169		-)))|=(((
170		-Column
171		-)))|=(((
172		-Prototype
173		-)))
174		-|(((
175		-content
176		-)))|(((
177		-content
178		-)))|(((
179		-longtext
180		-)))
181		-|(((
182		-creationDate
183		-)))|(((
184		-creationDate
185		-)))|(((
186		-dateTime
187		-)))
188		-|(((
189		-lastModified
190		-)))|(((
191		-lastModified
192		-)))|(((
193		-dateTime
194		-)))
	75	+|= Attribute name |= Column |= Prototype
	76	+| content | content | longtext
	77	+| creationDate | creationDate | dateTime
	78	+| lastModified | lastModified | dateTime
195	195
196	196	If you did everything well, the list of attributes should look like this:
197	197
198		-[[image:attach:list_wlock.png]]
199		-
200	200	You will notice that the attributes have a column with a lock in it. When a lock is present, it will use the value of that attribute for //UPDATE ... WHERE attribute = ''// statement. This is to do optimistic locking, aka to prevent data conflict when the data object was modified by two different users. Using timestamps for optimistic locking is not a good idea because for certain RDBMS, the value can be different because of milliseconds, so remove the locks on the **creationDate** attribute. The final list should look like this:
201	201
202		-[[image:attach:list.png]]
203		-
204	204	Next step is to create the **Author** entity. Create a new entity with **Author** at its name (and also as the table name), and for the class name, use **your.app.model.Author**. The attributes for this entity are:
205	205
206		-|=(((
207		-Attribute name
208		-)))|=(((
209		-Column
210		-)))|=(((
211		-Prototype
212		-)))
213		-|(((
214		-firstName
215		-)))|(((
216		-firstName
217		-)))|(((
218		-varchar50
219		-)))
220		-|(((
221		-lastName
222		-)))|(((
223		-lastName
224		-)))|(((
225		-varchar50
226		-)))
227		-|(((
228		-email
229		-)))|(((
230		-email
231		-)))|(((
232		-varchar100
233		-)))
	86	+|= Attribute name |= Column |= Prototype
	87	+| firstName | firstName | varchar50
	88	+| lastName | lastName | varchar50
	89	+| email | email | varchar100
234	234
235	235	Final list of attributes should look like this:
236	236
237		-[[image:attach:author_list.png]]
238		-
239	239	Now, it's time to link the two entities together. An Author can have multiple blog entries, and a BlogEntry can only have one author. To create the relationship (the join), right-click on **Author** and select **New Relationship**. On your right, select **BlogEntry** in the list. On your left, select **to many BlogEntries**, and on your right, select **to one Author**. Now, in BlogEntry, we need to store the primary key of the author so that we can make the join. The relationship builder allow us to add that attribute, so make sure **and a new foreign key named** is checked (it is checked by default). The **Create Relationship** pane should look like this:
240	240
241		-[[image:attach:relationship.png]]
242		-
243	243	If you check in the **Outline** tab, you should see that **Author** now have a **blogEntries** relationship, and **BlogEntry** have a **author** relationship.
244	244
245		-[[image:attach:outline_tab.png]]
	97	+You are now ready to save the model. Save it (File > Save) and close the **Entity Modeler** window. If you open the **Sources** in the main Eclipse window, you will notice that the **Sources** folder contains a package named **your.app.model**. (If this folder doesn't appear, you may need to set your preferences to automatically generate these source files; see the second suggestion on http:~/~/wiki.wocommunity.org/display/documentation/Useful+Eclipse+or+WOLips+Preferences.)
246	246
247		-You are now ready to save the model. Save it (File -> Save) and close the **Entity Modeler** window. If you open the **Sources** in the main Eclipse window, you will notice that the **Sources** folder contains a package named **your.app.model**. (If this folder doesn't appear, you may need to set your preferences to automatically generate these source files; see the second suggestion on [[http:~~/~~/wiki.wocommunity.org/display/documentation/Useful+Eclipse+or+WOLips+Preferences>>url:http://wiki.wocommunity.org/display/documentation/Useful+Eclipse+or+WOLips+Preferences||rel="nofollow" shape="rect" class="external-link"]].)
	99	+That package have four Java classes: **Author**, **Author**, **BlogEntry** and **BlogEntry**. Those classes were generated by Veogen, a templating engine build on Velocity. The two classes that starts with a underscore are recreated every time you change the EOModel, so if you want to change something in those classes, you need to change the template (no need for that right now). But you can change freely the two classes that don't have the underscore, and this is what we will be doing.
248	248
249		-
250		-
251		-That package have four Java classes: **_Author**, **Author**, **_BlogEntry** and **BlogEntry**. Those classes were generated by Veogen, a templating engine build on Velocity. The two classes that starts with a underscore are recreated every time you change the EOModel, so if you want to change something in those classes, you need to change the template (no need for that right now). But you can change freely the two classes that don't have the underscore, and this is what we will be doing.
252		-
253		-
254		-
255	255	What we are going to do is to write a simple method that returns the full name of an author, e.g. a method that simply concatenate the first name, a space and the last name of the author. To do so, double-click on **Author.java** and add the following methods:
256	256
257	257	{{code}}
	104	+
258	258	public String fullName() {
259	259	return this.firstName() + " " + this.lastName();
260	260	}
...	...	@@ -264,6 +264,7 @@
264	264	Nothing fancy here. Now open **BlogEntry.java** and add the following method:
265	265
266	266	{{code}}
	114	+
267	267	@Override
268	268	public void awakeFromInsertion(EOEditingContext editingContext) {
269	269	super.awakeFromInsertion(editingContext);
...	...	@@ -293,6 +293,7 @@
293	293	Remove the pound char in front of those two properties:
294	294
295	295	{{code}}
	144	+
296	296	#er.migration.migrateAtStartup=true
297	297	#er.migration.createTablesIfNecessary=true
298	298
...	...	@@ -301,14 +301,16 @@
301	301	After removing the pound char, the two properties should look like this:
302	302
303	303	{{code}}
	153	+
304	304	er.migration.migrateAtStartup=true
305	305	er.migration.createTablesIfNecessary=true
306	306
307	307	{{/code}}
308	308
309		-You are now ready to start the application so that it creates the database! To do so, right-click on **Application.java** (in the **your.app** folder) and select **Run As** -> **WOApplication**. In Eclipse's Console tab, you should see some output, including something similar to:
	159	+You are now ready to start the application so that it creates the database To do so, right-click on **Application.java** (in the **your.app** folder) and select **Run As** > **WOApplication**. In Eclipse's Console tab, you should see some output, including something similar to:
310	310
311	311	{{code}}
	162	+
312	312	BlogRest[62990] INFO er.extensions.migration.ERXMigrator - Upgrading BlogModel to version 0 with migration 'your.app.model.migrations.BlogModel0@4743bf3d'
313	313	BlogRest[62990] INFO er.extensions.jdbc.ERXJDBCUtilities - Executing CREATE TABLE Author(email VARCHAR(100) NOT NULL, firstName VARCHAR(50) NOT NULL, id INTEGER NOT NULL, lastName VARCHAR(50) NOT NULL)
314	314	BlogRest[62990] INFO er.extensions.jdbc.ERXJDBCUtilities - Executing ALTER TABLE Author ADD PRIMARY KEY (id)
...	...	@@ -319,7 +319,7 @@
319	319
320	320	{{/code}}
321	321
322		-If you see this and that the application is running (it should open a window in your favorite browser), migration worked and your database have been created, congratulations! You can now stop the application (click the square red button in Eclipse's Console tab) and continue to the next step.
	173	+If you see this and that the application is running (it should open a window in your favorite browser), migration worked and your database have been created, congratulations You can now stop the application (click the square red button in Eclipse's Console tab) and continue to the next step.
323	323
324	324	= Creating REST controllers and routes =
325	325
...	...	@@ -356,14 +356,15 @@
356	356	* **indexAction**: to list all (or a sublist) of the objects.
357	357
358	358	{{info}}
359		-In Project Wonder, **Action** at the end of a method is a convention for REST and Direct Actions, when you call those methods from certain components, you don't need to add the **Action** part.
	210	+In Project Wonder, *Action* at the end of a method is a convention for REST and Direct Actions, when you call those methods from certain components, you don't need to add the *Action* part.
360	360	{{/info}}
361	361
362		-For this tutorial, we will implement the **createAction** and **indexAction** methods. But first, we need to create a key filter. A key filter will... filter the input and the output of REST request so that you don't have to send all attributes for a blog entry. For example, we want to show the details for an author, but we don't want to show the password for the author (in real-life, the password would be encrypted)!
	213	+For this tutorial, we will implement the **createAction** and **indexAction** methods. But first, we need to create a key filter. A key filter will... filter the input and the output of REST request so that you don't have to send all attributes for a blog entry. For example, we want to show the details for an author, but we don't want to show the password for the author (in real-life, the password would be encrypted)
363	363
364	364	Add this method in **BlogEntryController**:
365	365
366	366	{{code}}
	218	+
367	367	protected ERXKeyFilter filter() {
368	368	ERXKeyFilter personFilter = ERXKeyFilter.filterWithAttributes();
369	369	personFilter.setAnonymousUpdateEnabled(true);
...	...	@@ -380,6 +380,7 @@
380	380	Now, let's implement the **createAction** method:
381	381
382	382	{{code}}
	235	+
383	383	public WOActionResults createAction() throws Throwable {
384	384	BlogEntry entry = create(filter());
385	385	editingContext().saveChanges();
...	...	@@ -393,6 +393,7 @@
393	393	Last step in the controller: implementing the **indexAction** method. Again, the code is simple:
394	394
395	395	{{code}}
	249	+
396	396	public WOActionResults indexAction() throws Throwable {
397	397	NSArray<BlogEntry> entries = BlogEntry.fetchAllBlogEntries(editingContext());
398	398	return response(entries, filter());
...	...	@@ -409,6 +409,7 @@
409	409	A route in ERRest is simply a way to define the URL for the entities and to specify which controller the route should use. When your controller extends from **ERXDefaultRouteController**, it's easy to register a controller and a route. In **Application.java**, in the **Application** constructor, add the following code:
410	410
411	411	{{code}}
	266	+
412	412	ERXRouteRequestHandler restRequestHandler = new ERXRouteRequestHandler();
413	413	restRequestHandler.addDefaultRoutes(BlogEntry.ENTITY_NAME);
414	414	ERXRouteRequestHandler.register(restRequestHandler);
...	...	@@ -418,13 +418,13 @@
418	418
419	419	The **addDefaultRoutes** method do all of the required magic, and use convention. That's why we had to name the controller **BlogEntryController**, because the convention is <EntityName>Controller.
420	420
421		-We are now reading to add and list blog postings! Start the application and take notice of the URL. It should be something like _[[http:~~/~~/yourip:someport/cgi-bin/WebObjects/BlogRest.woa_>>url:http://youripsomeport||shape="rect"]]
	276	+We are now reading to add and list blog postings Start the application and take notice of the URL. It should be something like //[[http:~~/~~/yourip:someport/cgi-bin/WebObjects/BlogRest.woa>>http://yourip:someport/cgi-bin/WebObjects/BlogRest.woa_]]//
422	422
423	423	== Adding posts and authors with curl ==
424	424
425	425	Since we didn't implement any HTML for our REST routes, we will create blog entries with //curl//, an open source HTTP client that is bundled with Mac OS X (you can use another client, like wget, if you like too). So let's create a blog entry.
426	426
427		-To create a blog entry, you need to use the POST HTTP method. We will use JSON as the format since it's a bit less chatty than XML. So if the URL to the application is //[[http:~~/~~/192.168.0.102:52406/cgi-bin/WebObjects/BlogRest.woa_>>url:http://192.168.0.102:52406/cgi-bin/WebObjects/BlogRest.woa_||shape="rect"]], the full _curl// command will be:
	282	+To create a blog entry, you need to use the POST HTTP method. We will use JSON as the format since it's a bit less chatty than XML. So if the URL to the application is //[[http:~~/~~/192.168.0.102:52406/cgi-bin/WebObjects/BlogRest.woa>>http://192.168.0.102:52406/cgi-bin/WebObjects/BlogRest.woa_]], the full curl// command will be:
428	428
429	429	{{code}}
430	430	curl -X POST -v -d '{ "title": "First post", "content": "Some text", "author": { "firstName": "Pascal", "lastName": "Robert", "email": "probert@macti.ca" } }' http://192.168.0.102:52406/cgi-bin/WebObjects/BlogRest.woa/ra/blogEntries.json
...	...	@@ -433,6 +433,7 @@
433	433	The response should look this:
434	434
435	435	{{code}}
	291	+
436	436	HTTP/1.0 201 Apple WebObjects
437	437	Content-Length: 249
438	438	x-webobjects-loadaverage: 0
...	...	@@ -445,6 +445,7 @@
445	445	To get a list of blog entries:
446	446
447	447	{{code}}
	304	+
448	448	curl -X GET http://192.168.0.102:52406/cgi-bin/WebObjects/BlogRest.woa/ra/blogEntries.json
449	449
450	450	{{/code}}
...	...	@@ -456,6 +456,7 @@
456	456	Now, let's build a HTML view for blog posts (you don't want your readers to get your posts by JSON, right?). Again, we will use convention to make it work easily. Open up **BlogEntryController** and add the following method:
457	457
458	458	{{code}}
	316	+
459	459	@Override
460	460	protected boolean isAutomaticHtmlRoutingEnabled() {
461	461	return true;
...	...	@@ -463,11 +463,12 @@
463	463
464	464	{{/code}}
465	465
466		-Switching the return value of this method says that we will follow a certain convention for HTML components. The convention for automatic HTML routing is that the component should be named <EntityName><Action>Page.wo. So in our case, the component will be **BlogEntryIndexPage**. Right-click on the project name in Eclipse and select **New** -> **WOComponent**. Change the name to **BlogEntryIndexPage** and check the **Create HTML contents** button. Click **Finish**.
	324	+Switching the return value of this method says that we will follow a certain convention for HTML components. The convention for automatic HTML routing is that the component should be named <EntityName><Action>Page.wo. So in our case, the component will be **BlogEntryIndexPage**. Right-click on the project name in Eclipse and select **New** > **WOComponent**. Change the name to **BlogEntryIndexPage** and check the **Create HTML contents** button. Click **Finish**.
467	467
468	468	The next step to get it to work is to make **BlogEntryIndexPage** to implement the **er.rest.routes.IERXRouteComponent** interface.
469	469
470	470	{{code}}
	329	+
471	471	import er.rest.routes.IERXRouteComponent;
472	472
473	473	public class BlogEntryIndexPage extends WOComponent implements IERXRouteComponent {
...	...	@@ -477,6 +477,7 @@
477	477	So now, the automatic HTML routing will send the request for **ra/blogEntries.html** to the **BlogEntryIndexPage** component. But we don't have any content in this component, so let's make a method to fetch all blog entries per creation date in descending order. So in **BlogEntryIndexPage.java**, add the following method:
478	478
479	479	{{code}}
	339	+
480	480	public NSArray<BlogEntry> entries() {
481	481	EOEditingContext ec = ERXEC.newEditingContext();
482	482	return BlogEntry.fetchAllBlogEntries(ec, BlogEntry.CREATION_DATE.descs());
...	...	@@ -487,6 +487,7 @@
487	487	We need to use that method in a WORepetition, and for that loop, we need a BlogEntry variable to iterate in the list, so add the following code to **BlogEntryIndexPage.java**:
488	488
489	489	{{code}}
	350	+
490	490	private BlogEntry entryItem;
491	491
492	492	public BlogEntry entryItem() {
...	...	@@ -502,6 +502,7 @@
502	502	The Java part is done, so let's add the loop inside the component. Open **BlogEntryIndexPage.wo** (it's located in the **Component** folder) and right after the <body> tag, add:
503	503
504	504	{{code}}
	366	+
505	505	<wo:loop list="$entries" item="$entryItem">
506	506	<p><wo:str value="$entryItem.title" /></p>
507	507	<p><wo:str value="$entryItem.author.fullName" /></p>
...	...	@@ -511,13 +511,14 @@
511	511
512	512	That component code will loop over the blog entries and display the title of the entry + the name of the author. Save everything and run the application.
513	513
514		-If you go to [[http:~~/~~/192.168.0.102:52406/cgi-bin/WebObjects/BlogRest.woa/ra/blogEntries.html>>url:http://192.168.0.102:52406/cgi-bin/WebObjects/BlogRest.woa/ra/blogEntries.html||shape="rect"]], you will see the list of blog entries!
	376	+If you go to [[http://192.168.0.102:52406/cgi-bin/WebObjects/BlogRest.woa/ra/blogEntries.html]], you will see the list of blog entries
515	515
516	516	Now that we have a list of blog entries, let's make a page to show the content of a blog entry. Create a new component named **BlogEntryShowPage**.
517	517
518		-Open **BlogEntryShowPage.java** and make sure the class implements **er.rest.routes.IERXRouteComponent**.
	380	+Open **BlogEntryShowPage.java** and make sure the class implements&nbsp;**er.rest.routes.IERXRouteComponent**.
519	519
520	520	{{code}}
	383	+
521	521	import er.rest.routes.IERXRouteComponent;
522	522
523	523	public class BlogEntryShowPage extends WOComponent implements IERXRouteComponent {
...	...	@@ -527,6 +527,7 @@
527	527	We need to add other methods to receive the BlogEntry object from the controller. In **BlogEntryShowPage.java**, add:
528	528
529	529	{{code}}
	393	+
530	530	private BlogEntry blogEntry;
531	531
532	532	@ERXRouteParameter
...	...	@@ -545,6 +545,7 @@
545	545	The Java part of the work is done, so save the Java class. It's time to work on the component part. Open **BlogEntryShowPage.wo** and between the <body></body> part, add:
546	546
547	547	{{code}}
	412	+
548	548	<h1><wo:str value="$blogEntry.title" /></h1>
549	549	<p><wo:str value="$blogEntry.content" /></p>
550	550	<p>Created on: <wo:str value="$blogEntry.creationDate" dateformat="%Y/%m/%d" /></p>
...	...	@@ -555,6 +555,7 @@
555	555	Our view component is done, the only thing remaining is a link for the blog entry list (BlogEntryIndexPage) to the view page (BlogEntryShowPage). Save **BlogEntryShowPage.wo** and open **BlogEntryIndexPage.wo**. We are going to add a link on the title, you will replace to replace this:
556	556
557	557	{{code}}
	423	+
558	558	<p><wo:str value="$entryItem.title" /></p>
559	559
560	560	{{/code}}
...	...	@@ -562,10 +562,11 @@
562	562	with:
563	563
564	564	{{code}}
	431	+
565	565	<p><wo:ERXRouteLink entityName="BlogEntry" record="$entryItem" action="show"><wo:str value="$entryItem.title" /></wo:ERXRouteLink></p>
566	566
567	567	{{/code}}
568	568
569		-Save the component and run the app. Go to [[http:~~/~~/192.168.0.102:52406/cgi-bin/WebObjects/BlogRest.woa/ra/blogEntries.html>>url:http://192.168.0.102:52406/cgi-bin/WebObjects/BlogRest.woa/ra/blogEntries.html||shape="rect"]] to get the list of posts, and you should see a link on the title. Click on it, and now you get the full details of the blog entry!
	436	+Save the component and run the app. Go to [[http://192.168.0.102:52406/cgi-bin/WebObjects/BlogRest.woa/ra/blogEntries.html]] to get the list of posts, and you should see a link on the title. Click on it, and now you get the full details of the blog entry
570	570
571		-The REST part of this tutorial is now complete, [[you can now move to the next part of the tutorial>>doc:Your First Framework]].
	438	+The REST part of this tutorial is now complete, [[you can now move to the next part of the tutorial>>Your First Framework]].