Study Guide Site

Question 1

What is the DDL class in Magento?

Answer 1

The only DDL class in Magento is Varien_Db_Ddl_Table

Question 2

Which block is responsible for rendering javascript in Magento?

Answer 2

Mage_Page_Block_Html_Head
addJs(),
addJsIe(),
addItem(),
getCssJsHtml()

Question 3

Which product types exist in Magento?

Answer 3

Magento has 6 standard product types,
Configurable
Simple
Grouped
Bundle
Virtual
Downloadable

Question 4

Which product types are implemented as part of the Mage_Catalog module, and which are not?

Answer 4

Mage_Catalog - simple, grouped, configurable, virtual
Mage_Bundle - bundle
Mage_Downloadable - downloadable

Question 5

Which classes and files should be checked if a link to a custom javascript file isn’t being rendered on a page?

Answer 5

Mage_Page_Block_Html_Head
addJs(),
addJsIe(),
addItem(),
getCssJsHtml()

Question 6

Which product types implement a parent-child relationship between product entities?

Answer 6

configurable, bundle and grouped

Question 7

Which database tables are shared between product types, and which ones are specific to one product type?

Answer 7

Specific to one product type:
configurable - catalog_product_super_link:table
For configurable, grouped and bundle - catalog_product_relation table

Question 8

What steps need to be taken in order to implement a custom product type?

Answer 8

Add product types config entry

Question 9

How do the different product types handle price calculation?

Answer 9

catalog/product_type_configurable_price

Question 10

Which indexing processes does the product type influence?

Answer 10

Product Price

Question 11

Which product types implement a parent-child relationship between product entities?

Answer 11

configurable product type - configurable(parent) - simple(child)
may be grouped and bundle as well
prepareForCartAdvanced() - initialize product for add to cart process..
calls to prepareProduct() - process product and prepare options
calls to prepareOptions() - Process custom defined options

Question 12

What are total models responsible for in Magento?

Answer 12

quote, invoice, creditmemo
discount
- grand total
- shipping
- subtotal
- tax
- nominal
- custbalance
- freeshipping

Question 13

How and when is the include path set up and the auto loader registered?

Answer 13

in Mage.php (Varien_Autoload::register();)

Question 14

How and when does Magento load the base configuration, the module configuration, and the database configuration?

Answer 14

Using class Mage_Core_Model_Config:
Magento calls loadBase() to load config file
Next, calls Method: loadModules() to load modules,
then calls loadDb(() to load the database configuration

Question 15

How does Magento process requests that cannot be mapped?

Answer 15

It will send user to a 4 O 4 page using cms/index/noRoute

Question 16

After a matching action controller is found, what steps occur before the action method is executed?

Answer 16

The controller class is instantiated
Then sets module name,
controller name,
action name,
controller module name & parameters.
Then calls:
setDispatched(true);
Then dispatch($action) to dispatch the request

Question 17

What is the difference regarding module loading between Mage::run() and Mage::app()?

Answer 17

Mage::app() :: initializes the application object with all variables and objects which are required to access magento 
Mage::run() :: is the Frontend entry point which means it loads the configuration files, module configuration, load Database and handles request processing.

Question 18

What is the difference regarding module loading between Mage::run() and Mage::app()?

Answer 18

Mage::app() - Initialize application without request processing.
Mage::run() - Run application. Run process responsible for request processing and sending response.

Question 19

Which classes are responsible for the layout being loaded?

Answer 19

Class Mage_Core_Controller_Varien_Action:
Method loadLayout() - processes the request to load layout

Class Mage_Core_Model_Layout
Method \_\_construct() - loads layout xml

Class Mage_Core_Model_Layout_Update
Method load() - load layout updates by handles

Question 20

Which ways exist to specify the layout update handles that will be processed during a request?

Answer 20

jquery/jquery-1.8.1.min.js

<!- or

jquery/jquery-1.8.1.min.js

->

Question 21

Which class is responsible for sending output?

Answer 21

The Mage_Core_Controller_Response_Http class

Magento uses a response object to send all output.

All output is added to this object, and then its sendResponse method is called.

Question 22

What is the responsibility of Front Controller?

Answer 22

Directly receive the request from browser.
All requests call the function Mage_Core_Controller_Varien_Front::dispatch()
- URL rewriting process.
- Load the module and action controller corresponding with the requests through routers to process the requirements which are sent from clients.

Question 23

How to pass variables from layout to block?

Answer 23

category_id3
In the block, this can be retrieved by..
$categoryId = $this->getCategoryId();
$categoryId = $this->getData(‘category_id’);

Question 24

Add and customize Javascript

Answer 24

in js folder,

in skin js folder,
skin_jsjs/test.js

Question 25

Which events are associated with sending output?

Answer 25

http_response_send_before controller_front_send_response_before controller_front_send_response_after

Question 26

How and when are the two main types of setup script executed?

Answer 26

In Mage_Core_Model_App::_initModules(), calls Mage_Core_Model_Resource_Setup::applyAllUpdates(), and it then calls applyUpdates() to check version number from config.xml.. The config.xml version number is checked against core_resource table's version of the module.

Question 27

Which is the base setup class for flat table entities, and which one the base for EAV entities?

Answer 27

Flat table: Mage_Core_Model_Resource_Setup | EAV table: Mage_Eav_Model_Entity_Setup

Question 28

When does Magento decide which store view to use, and when is the current locale set?

Answer 28

Class . Mage_Core_Model_App:: Method: run() which includes _initCurrentStore() :: Loads all websites, group and stores into website, group and store object using _initStores() this function checks whether the site is website or store group or store, currentStore = $store; Current locale set in Mage_Core_Model_App init() is called init() calls $this->_initEnvironment(); which has a setting of locale

Question 29

When are the request and response objects initialized?

Answer 29

``` Class Mage_Core_Model_App Method getRequest() Method getResponse() ```

Question 30

Which ways exist in Magento to add router classes?

Answer 30

1) Add router section to the config file. The declare a module router and use your router instead of standard 2) Use an event observer to add a router

Question 31

Which routers exist in a native Magento implementation?

Answer 31

Admin, Standard, CMS and Default

Question 32

How does the framework discover active modules and their configuration?

Answer 32

Class Mage_Core_Model_Config | Method: _loadDeclaredModules()

Question 33

Explain how Magento loads and manipulates configuration information?

Answer 33

$this->loadBase(); //config.xml and local.xml $this->loadModules(); //load all modules xml from app/etc/modules/ directory $this->_loadDeclaredModules(); //load each modules xml file $this->loadDb(); //load configuration from db load data from core_config_data into our configuration: 1. We add data about websites (see core_website table) 2. We add data about stores for the existing websites (see core_store table) 3. We add data from core_config_data according to the scope a. Create block first b. Then create block c. And, finally - d. Each iteration replaces data from more general area of the scope with more specific one

Question 34

What are the common methods with which the framework accesses its configuration values and areas?

Answer 34

getStoreConfig() getStoreConfigFlag(), getStore()-> getConfig(); getConfig()-> getNode();

Question 35

Which class runs total models processing?

Answer 35

``` Class Mage_SalesRule_Model_Validator Method process() applies and processes rules for each item of total models. Basically, rules are sorted by the priority and Magento applies rule by rule for each item ```

Question 36

What configuration parameters are available for event observers?

Answer 36

``` type (model, object, none, singleton), class (class name of observer), method (method to invoke) ```

Question 37

What is the structure of event observers, and how are properties accessed therein?

Answer 37

- for checkout/cart after adding product, Mage::dispatchEvent('checkout_cart_product_add_after', array('quote_item'=>$result, 'product'=>$product)); to call, $observer->getEvent()->getQuoteItem() and $observer->getEvent()->getProduct()

Question 38

What configuration parameters are available for cron jobs?

Answer 38

cron_expr to schedule | and model to run, with method name

Question 39

Explain lifecycle of a Block?

Answer 39

prepareLayout() called when after layout added to block _beforeToHtml() called before block rendered HTML _afterToHtml() called after a block's HTML content is generated. _beforeChildToHtml() called when a parent renders one of its children (through getChildHtml().

Question 40

What is the difference between payment method and payment classes (such as order_payment, quote_payment, etc.)?

Answer 40

Payment model is an abstract of an instance of payment method and it works with database. Payment model can be: Mage_Sales_Model_Order_Payment or Mage_Sales_Model_Quote_Payment - tables sales_flat_order_payment and sales_flat_quote_payment. Quote_Payment doesn't have any method to process an order.

Question 41

Which method is used for translating strings, and on which types of objects is it generally available?

Answer 41

Class Mage_Core_Helper_Abstract Method : underscore, underscore __() Translation is done in helper objects

Question 42

What is the difference between "pay" and "capture" operations?

Answer 42

pay() - Registers payment and update self totals from the invoice capture() - Requires an invoice. If none is specified, will automatically prepare an invoice for order Updates transactions hierarchy, if required Updates payment totals, updates order status and adds proper comments

Question 43

Which classes and methods are responsible for credit card operations (for example authorization or capturing)?

Answer 43

``` Class Mage_Payment_Model_Method_Cc Class Mage_Payment_Model_Method_Abstract: Methods authorize() and capture() ```

Question 44

Which classes are involved, and which tables are used to store refund information?

Answer 44

Class: Mage_Sales_Model_Order_Creditmemo* Table: sales_flat_creditmemo*

Question 45

How does Magento process taxes when refunding an order?

Answer 45

tax get refunded with order