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Nodes live in the database as separate parts. The node table contains most of the metadata describing the node. The node_revisions table contains the node s body and teaser, along with revision-specific information. And as you ve seen in the job_post.module example, other nodes are free to add data to the node at node load time and store whatever data they want in their own tables. A node object containing the most common attributes is pictured in Figure 7-7. Note that the table created by the field API to store the job post company is separate from the main node table. Depending on which other modules are enabled, the node objects in your Drupal installation might contain more or fewer properties.

Although creating a node module like you did with job_post.module offers exceptional control and performance, it s also a bit tedious. Wouldn t it be nice to be able to assemble a new node type without doing any programming That s what Drupal core s custom content types do for you. You can add new content types (such as a job_post content type) through the administrative interface at Structure -> Content types. Make sure to use a different name for the node type if you have job_post.module enabled to prevent a namespace collision. In the job_post.module example, you needed three fields: job title, job description (the node s body), and the name of the company posting the job. In the job_post module, you had to manually add the body field and the name of the company that posted the job. Using Drupal core s custom content types, you can eliminate all of the programming and simply create the node through the user interface. Drupal core handles all of the tasks of creating the tables, the insert, update, delete, access controls, and viewing nodes.

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So, if IP addresses uniquely identify hosts on the Internet, why don t you simply type the IP address when you want to connect to Amazon.com Easy: because it s a pain in the neck. So, to get around this problem, you will be exploiting the system known as DNS.

There are several ways to restrict access to nodes. You have already seen how to restrict access to a node type using hook_access() and permissions defined using hook_permissions(). But Drupal provides a much richer set of access controls using the node_access table and two more access hooks: hook_node_grants() and hook_node_access_records(). When Drupal is first installed, a single record is written to the node_access table, which effectively turns off the node access mechanism. Only when a module that uses the node access mechanism is enabled does this part of Drupal kick in. The function node_access_rebuild() in modules/node/node.module keeps track of which node access modules are enabled, and if they are all disabled, this function will restore the default record, which is shown in Table 7-2. Table 7-2. The Default Record for the node_access Table

second input parameters of the Where<T> method After constructing the MethodCallExpression instance, the Where<T> method creates a new instance of Query<T> Then it sets the new Query<T> instance s Expression property to the MethodCallExpression instance Once you understand how our query is represented as a MethodCallExpression instance, it should be easy to understand why the non-generic version of the Execute method is implemented the way it is in Listing 8-15 In the Execute method, we first check if the input expression that represents the query to execute is a MethodCallExpression If so, we further check if the MethodCallExpression represents a call to the Where<T> method of the Queryable class If that s not the case, then the query is outside the scope of what we want our custom query provider to support and therefore we throw a NotSupportedException.

In general, if a node access module is being used (that is, one that modifies the node_access table), Drupal will deny access to a node unless the node access module has inserted a row into the node_access table defining how access should be treated.

NOTE If you wanted, you could connect to Amazon.com by IP address only, but remembering these addresses would be nearly impossible. Humans need humanreadable names, and that s why we use DNS.

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