part ii  building a social network

... currently have no way of actually saving avatars, for example—but what we have presently is enough to build the pages for uploading and displaying avatars 12.1.2 Avatar upload page We’ll be giving RailsSpace ... in avatar_helper.rb, which relies on the Rails image_tag helper function: Listing 12.5 app/helpers/avatar helper.rb module AvatarHelper # Return an image tag for the user avatar def avatar_tag(user) ... an avatar is an image or other graphical representation of a particular person.1 On RailsSpace, the avatar will simply be an uploaded image It can be a picture of the user, but it doesn’t have...

Ngày tải lên: 13/08/2014, 08:20

... make the Avatar model a subclass of ActiveRecord::Base The answer is that we wanted access to the error handling and validation machinery provided by Active Record There’s probably a way to add ... simulated table names, foreign keys, and the has_many database association Adding and managing friendships will then take place through both email and web interfaces By the end of the chapter, ... user.screen_name, :password => user.password } What we want for an avatar test is something like post :upload, :avatar => { :image => image } But how we make an image suitable for posting? The answer...

Ngày tải lên: 13/08/2014, 08:20

... use a tag modifier as if it were an action, so that /specs/1;tag would respond to a PUT request and update the spec with a tag But look at it another way: Fundamentally, we are creating a tag and ... this case, @blog.posts is not exactly an array—among other things, it interacts with the database in a way that no plain array could—but the “append” operation really does everything that implies: ... Delete7 ) operations of relational databases In contrast to the traditional controller/action/id approach, REST embraces the radical notion that there are only four actions—the four CRUD operations—which,...

Ngày tải lên: 13/08/2014, 08:20

... considerations 507 Listing 17.1 config/database.yml development: adapter: mysql database: rails_space_development username: root password: host: localhost test: adapter: mysql database: rails_space_test ... One way to take some of the load off of your web and database servers is to use caching Rails has a powerful caching system to help avoid the computational and database-access expense of generating ... the way, the author provides detailed commentary and explanations to aid your understanding RAILSSPACE MICHAEL HARTL and AURELIUS PROCHAZKA ISBN: 0-321-48079-1 Ruby on Rails is fast displacing...

Ngày tải lên: 13/08/2014, 08:20

... configured and working StackMaker An application that an administrator can use to create a virtual stack of devices for easier visual management Threshold Manager A remote monitoring (RMON) application ... that you can select each interface as you build the router, and not accidentally select an interface that is not available for that particular device ConfigMaker can also collect information about ... suggests a technology need Sometimes that so-called “impossible” feat is actually available as a feature of a technology already available Other times, the requirement that drives that goal can be...

Ngày tải lên: 23/12/2013, 01:16

... Harcourt International for making certain that our vision remains worldwide in scope Annabel Dent, Anneka Baeten, Clare MacKenzie, and Laurie Giles of Harcourt Australia for all their help David ... her family, Dan, Justine, and Taylor, and her two Great Danes (a. k .a Mobile Defense Units), Marmaduke and Apollo and her Golden Retriever (a. k .a Mobile Alarm Unit) Pooka Melissa can be contacted ... not possible Database A Application A Database B Application B Database C Application C Database D Application D Users must know which application leads to which data If not, they suffer confusion...

Ngày tải lên: 23/12/2013, 01:16

... online chat system that can be used at anytime So at anytime users can start their own chats and invite others; they could join a chat already established, such as a help desk chat Also, chats can ... Solutions Fast Track What Is the MCS 5100? It is a SIP-based multimedia and collaborative applications server that also provides PBX-based features It is an applications-based, communications-based ... Client or an IP phone Since these services are running off an application database, they have significant advantages over the same feature you would have on a normal POTS phone In later chapters...

Ngày tải lên: 25/01/2014, 17:20

... literary criticism, newspaper and magazine articles, school texts, religious and The historical and distributional facts of Russian verbal gaps Traditional descriptions Grammars and dictionaries ... literaturnogo jayzka Moscow: Nauka Zaliznjak, A. A., ed 1977 Grammatičeskij slovar' russkogo jazyka: Slovoizmenenie Moskva: Russkij jazyk Zuraw, Kie 2003 Probability in language change In Probabilistic ... Russian gaps not meet the criteria for morphophonological competition as intended by Albright’s (2003) model, because the alternations apply automatically in Contemporary Standard Russian Analogical...

Ngày tải lên: 17/03/2014, 04:20

... executed, and sometimes these are not possible Database A Application A Database B Application B Database C Application C Database D Application D Users must know which application leads to which data ... her family, Dan, Justine, and Taylor, and her two Great Danes (a. k .a Mobile Defense Units), Marmaduke and Apollo and her Golden Retriever (a. k .a Mobile Alarm Unit) Pooka Melissa can be contacted ... displayed router system and protocol data, facilitating a novice administrator’s ability to understand how the router is configured and working StackMaker An application that an administrator can...

Ngày tải lên: 27/06/2014, 02:20

... database was analyzed and designed The website used MySQL – an open source relation database management system – to manage database The works of collecting data have been started when database ... output representation of data, such as a chart or a diagram Multiple views of the same data resentation are possible, such as a bar chart for management and a tabular view for accountants The controller ... store and manage data in CakePHP, we must config in CakePHP source code: Open app/Config/ and then rename database.php.default to database.php after that open it Code:

Ngày tải lên: 02/07/2014, 13:01

... configured and working StackMaker An application that an administrator can use to create a virtual stack of devices for easier visual management Threshold Manager A remote monitoring (RMON) application ... her family, Dan, Justine, and Taylor, and her two Great Danes (a. k .a Mobile Defense Units), Marmaduke and Apollo and her Golden Retriever (a. k .a Mobile Alarm Unit) Pooka Melissa can be contacted ... not possible Database A Application A Database B Application B Database C Application C Database D Application D Users must know which application leads to which data If not, they suffer confusion...

Ngày tải lên: 07/08/2014, 16:23

... we have identified VLANs What exactly is a virtual LAN? Simply put, a VLAN can be thought of as being equivalent to a broadcast domain Okay, then what is a broadcast domain? A broadcast domain ... that typically operate at Layer 2, the data-link layer However, Cisco has made some of their switches capable of operating at Layer 3, the network layer As you are already aware, this is the layer ... wide area network means for users at remote locations, or it can be via the organization’s local area network Access lists and other filtering on routers can also take place at this layer, just as...

Ngày tải lên: 07/08/2014, 17:20

... data to a server Application Application Presentation Presentation Router Session Interface Session Interface Transport Network Network Network Data Link Data Link Data Link Physical Physical ... about IPX is that there are multiple encapsulations possible Remember, an encapsulation is the header and sometimes a trailer placed around data packets This creates a “frame” around the data, ... Internet The DNS database is logically distributed among servers and is unlimited in its growth potential Each server maintains a separate physical DNS database, and each DNS database includes references...

Ngày tải lên: 07/08/2014, 17:20

... hop NOTE A network can be defined in many ways: It is called a local area network (LAN); it can be an IP subnet, defined by the Class A, Class B, or Class C address (and subnet mask); it can be the ... Area area-id authentication Specifies that authentication is going to be used in the area Area area-id authentication message-digest Sets authentication to use MD5 Area area-id stub [no-summary] ... Header (AH) protocol to encapsulate the original IP packet in another IP packet with a new IP header—the AH header AH can authenticate the data source, but the AH header does not provide data...

Ngày tải lên: 07/08/2014, 17:20

... should already know how many namespaces you will need, and what they are, from the DNS plan You should also have as many logical domains as you have namespaces, or more domains than namespaces ... addresses to support a larger number of workstations than there are IP addresses available When compared to a manually applied IP address, DHCP is much easier to manage In a manual system, each ... Global catalog Replicated traffic Global catalog servers all carry a copy of the global catalog partition of the Active Directory, but standard domain controllers don’t Changes to the global catalog...

Ngày tải lên: 07/08/2014, 17:20

... Seattle-SanFran LA-SanFran Portland-SanFran Phoenix-SanFran AllSitesBridge 5 16 60 minutes 30 minutes 60 minutes 60 minutes NA Available all hours Available all hours Available all hours Available all ... critical nature for password changes, you will want to give that role to a DC that has fault tolerant hardware, such as a RAID array or cluster You will also need to designate a potential backup ... The schema and configuration partitions are rarely changed and not cause much replication traffic Each domain is a separate partition of the Active Directory When a domain does not span a site,...

Ngày tải lên: 07/08/2014, 17:20

... of traffic and manage the available bandwidth Data traffic will attempt to use any and all available bandwidth to complete its transmissions At the application layer of the network, the data has ... domains Notice that we define each department as a broadcast domain Also notice that these domains lie within other larger broadcast areas that we define on geographic parameters—they may be in a ... DC-westcoast.com Global Catalog DNS DC-westcoast.com Global Catalog DNS Switch DC-westcoast.com Global Catalog DNS Infrastructure Master Schema Master DC-westcoast.com Global Catalog DNS San Francisco...

Ngày tải lên: 07/08/2014, 17:20

... PAR 19 20 EIA232 RX ATTACH PAR ACT ACT PAR RESET ACT PAR ACT PAR ACT PAR ACT PAR ACT PAR ACT PAR ACT PAR ACT PAR ACT PAR 10 ACT PAR 11 ACT PAR 12 ACT PAR 13 ACT PAR 14 ACT PAR 15 ACT PAR 16 ACT ... FAULT STACK EIA232 RESET ACT PAR TX ACT PAR ACT PAR ACT PAR ACT PAR ACT PAR ACT PAR ACT PAR ACT PAR 10 ACT PAR 11 ACT PAR 12 ACT PAR 13 ACT PAR 14 ACT PAR 15 ACT PAR 16 ACT PAR 17 ACT PAR 18 ACT ... MODE FAULT STACK EIA232 RESET ACT PAR RX ATTACH PAR ACT PAR EIA232 RESET ACT PAR ACT PAR ACT PAR ACT PAR ACT PAR ACT PAR ACT PAR ACT PAR ACT PAR 10 ACT PAR 11 ACT PAR 12 ACT PAR 13 ACT PAR 14 ACT...

Ngày tải lên: 07/08/2014, 17:20

... that positional advantages are unequally distributed domains A second limitation was that the measure of professional contacts was crude and not validated against a gold standard However, it was ... conceptualize and measure specific network characteristics, which may be related to relevant outcomes A social network approach may be particularly relevant if actors have imperfect information ... responsible for data analysis, and wrote the paper ME was responsible for data collection and JK performed data analysis All authors critical feedback and approved the final manuscript Competing...

Ngày tải lên: 10/08/2014, 11:20

... classifications, and switch extensions that are relevant to a particular physical network A logical switch is essentially a template that contains an administrator-defined set of parameters CHAPTER ... create a static IP CHAPTER Key concepts address pool, you can also define a reserved range of IP addresses that can be assigned to load balancers as virtual IP addresses VMM automatically assigns ... virtual machines and network cards that allow you to take advantage of some of the features provided by your host hardware Port classifications Port classifications are linked to network adapter...

Ngày tải lên: 20/10/2014, 14:42