1Maypole::Model::Base(3)User Contributed Perl DocumentatioMnaypole::Model::Base(3)
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6 Maypole::Model::Base - Base class for model classes
7
9 This is the base class for Maypole data models. This is an abstract
10 class that defines the interface, and can't be used directly.
11 process
13 This is the engine of this module. Given the request object, it
14 populates all the relevant variables and calls the requested action.
15 Anyone subclassing this for a different database abstraction mechanism
17 needs to provide the following methods:
18 setup_database
20 $model->setup_database($config, $namespace, @data)
21 Uses the user-defined data in @data to specify a database- for example,
23 by passing in a DSN. The model class should open the database, and
24 create a class for each table in the database. These classes will then
25 be "adopt"ed. It should also populate "$config->tables" and
26 "$config->classes" with the names of the classes and tables
27 respectively. The classes should be placed under the specified
28 namespace. For instance, "beer" should be mapped to the class
29 "BeerDB::Beer".
30 class_of
32 $model->class_of($r, $table)
33 This maps between a table name and its associated class.
35 fetch_objects
37 This class method is passed a request object and is expected to return
38 an object of the appropriate table class from information stored in the
39 request object.
40 adopt
42 This class method is passed the name of a model class that represensts
43 a table and allows the master model class to do any set-up required.
44 columns
46 This is a list of all the columns in a table. You may also override see
47 also "display_columns"
48 table
50 This is the name of the table.
51 Actions
53 do_edit
54 If there is an object in "$r->objects", then it should be edited
55 with the parameters in "$r->params"; otherwise, a new object should
56 be created with those parameters, and put back into "$r->objects".
57 The template should be changed to "view", or "edit" if there were
58 any errors. A hash of errors will be passed to the template.
59 list
61 The "list" method should fill "$r->objects" with all of the objects
62 in the class. You may want to page this using "Data::Page" or
63 similar.
64 edit
66 Empty Action.
67 view
69 Empty Action.
70 index
72 Empty Action, calls list if provided with a table.
73 Also, see the exported commands in "Maypole::Model::CDBI".
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77 Additionally, individual derived model classes may want to override the
78 following methods:
79 display_columns
81 Returns a list of columns to display in the model. By default returns
82 all columns in alphabetical order. Override this in base classes to
83 change ordering, or elect not to show columns.
84 list_columns
86 Same as display_columns, only for listings. Defaults to display_columns
87 column_names
89 Return a hash mapping column names with human-readable equivalents.
90 is_public
92 should return true if a certain action is supported, or false
93 otherwise. Defaults to checking if the sub has the ":Exported"
94 attribute.
95 add_model_superclass
97 Adds model as superclass to model classes (if necessary)
98 method_attrs
100 Returns the list of attributes defined for a method. Maypole itself
101 only defines the "Exported" attribute.
102 related
104 This can go either in the master model class or in the individual
105 classes, and returns a list of has-many accessors. A brewery has many
106 beers, so "BeerDB::Brewery" needs to return "beers".
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109 Maypole, Maypole::Model::CDBI.
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112 Maypole is currently maintained by Aaron Trevena.
113
115 Simon Cozens, "simon#cpan.org"
116 Simon Flack maintained Maypole from 2.05 to 2.09
118 Sebastian Riedel, "sri#oook.de" maintained Maypole from 1.99_01 to 2.04
120
122 You may distribute this code under the same terms as Perl itself.
123perl v5.32.0 2020-07-28 Maypole::Model::Base(3)