Maypole::Model::CDBI::Base(3pm)

1Maypole::Model::CDBI::BUasseer(3C)ontributed Perl DocumeMnatyaptoiloen::Model::CDBI::Base(3)
2
3
4

NAME

6       Maypole::Model::CDBI::Base - Model base class based on Class::DBI
7

DESCRIPTION

9       This is a master model class which uses Class::DBI to do all the hard
10       work of fetching rows and representing them as objects. It is a good
11       model to copy if you're replacing it with other database abstraction
12       modules.
13
14       It implements a base set of methods required for a Maypole Data Model.
15
16       It inherits accessor and helper methods from Maypole::Model::Base.
17
18   add_model_superclass
19       Adds model as superclass to model classes (if necessary)
20

Action Methods

22       Action methods are methods that are accessed through web (or other
23       public) interface.
24
25   do_edit
26       If there is an object in "$r->objects", then it should be edited with
27       the parameters in "$r->params"; otherwise, a new object should be
28       created with those parameters, and put back into "$r->objects".  The
29       template should be changed to "view", or "edit" if there were any
30       errors. A hash of errors will be passed to the template.
31
32   view
33       This command shows the object using the view factory template.
34
35   delete
36       Deprecated method that calls do_delete or a given classes delete
37       method, please use do_delete instead
38
39   do_delete
40       Unsuprisingly, this command causes a database record to be forever
41       lost.
42
43       This method replaces the, now deprecated, delete method provided in
44       prior versions
45
46   search
47       Deprecated searching method - use do_search instead.
48
49   do_search
50       This action method searches for database records, it replaces the, now
51       deprecated, search method previously provided.
52
53   list
54       The "list" method fills "$r->objects" with all of the objects in the
55       class. The results are paged using a pager.
56

Helper Methods

58   adopt
59       This class method is passed the name of a model class that represents a
60       table and allows the master model class to do any set-up required.
61
62   related
63       This method returns a list of has-many accessors. A brewery has many
64       beers, so "BeerDB::Brewery" needs to return "beers".
65
66   related_class
67       Given an accessor name as a method, this function returns the class
68       this accessor returns.
69
70   search_columns
71         $class->search_columns;
72
73       Returns a list of columns suitable for searching - used in factory
74       templates, over-ridden in classes. Provides same list as
75       display_columns unless over-ridden.
76
77   related_meta
78         $class->related_meta($col);
79
80       Returns the hash ref of relationship meta info for a given column.
81
82   stringify_column
83          Returns the name of the column to use when stringifying
84          and object.
85
86   do_pager
87          Sets the pager template argument ($r->{template_args}{pager})
88          to a Class::DBI::Pager object based on the rows_per_page
89          value set in the configuration of the application.
90
91          This pager is used via the pager macro in TT Templates, and
92          is also accessible via Mason.
93
94   order
95           Returns the SQL order syntax based on the order parameter passed
96           to the request, and the valid columns.. i.e. 'title ASC' or 'date_created DESC'.
97
98           $sql .= $self->order($r);
99
100           If the order column is not a column of this table,
101           or an order argument is not passed, then the return value is undefined.
102
103           Note: the returned value does not start with a space.
104
105   fetch_objects
106       Returns 1 or more objects of the given class when provided with the
107       request
108
109   _isa_class
110       Private method to return the class a column belongs to that was
111       inherited by an is_a relationship.  This should probably be public but
112       need to think of API
113
114   column_type
115           my $type = $class->column_type('column_name');
116
117       This returns the 'type' of this column (VARCHAR(20), BIGINT, etc.)  For
118       now, it returns "BOOL" for tinyints.
119
120       TODO :: TEST with enums
121
122   required_columns
123         Accessor to get/set required columns for forms, validation, etc.
124
125         Returns list of required columns. Accepts an array ref of column names.
126
127         $class->required_columns([qw/foo bar baz/]);
128
129         Allows you to specify the required columns for a class, over-riding any
130         assumptions and guesses made by Maypole.
131
132         Any columns specified as required will no longer be 'nullable' or optional, and
133         any columns not specified as 'required' will be 'nullable' or optional.
134
135         The default for a column is nullable, or whatever is discovered from database
136         schema.
137
138         Use this instead of $config->{$table}{required_cols}
139
140         Note : you need to setup the model class before calling this method.
141
142   column_required
143         Returns true if a column is required
144
145         my $required = $class->column_required($column_name);
146
147         Columns can be required by the application but not the database, but not the other way around,
148         hence there is also a column_nullable method which will tell you if the column is nullable
149         within the database itself.
150
151   column_nullable
152         Returns true if a column can be NULL within the underlying database and false if not.
153
154         my $nullable = $class->column_nullable($column_name);
155
156         Any columns that are not nullable will automatically be specified as required, you can
157         also specify nullable columns as required within your application.
158
159         It is recomended you use column_required rather than column_nullable within your
160         application, this method is more useful if extending the model or handling your own
161         validation.
162
163   column_default
164       Returns default value for column or the empty string.  Columns with
165       NULL, CURRENT_TIMESTAMP, or Zeros( 0000-00...) for dates and times have
166       '' returned.
167
168   get_classmetadata
169       Gets class meta data *excluding cgi input* for the passed in class or
170       the calling class. *NOTE* excludes cgi inputs. This method is handy to
171       call from templates when you need some metadata for a related class.
172

AUTHOR

177       Maypole is currently maintained by Aaron Trevena.
178

AUTHOR EMERITUS

180       Simon Cozens, "simon#cpan.org"
181
182       Simon Flack maintained Maypole from 2.05 to 2.09
183
184       Sebastian Riedel, "sri#oook.de" maintained Maypole from 1.99_01 to 2.04
185

LICENSE

187       You may distribute this code under the same terms as Perl itself.
188
189
190
191perl v5.30.1                      2020-01-30     Maypole::Model::CDBI::Base(3)