1DBIx::Class::Manual::CoUmspeorneCnotn(t3r)ibuted Perl DoDcBuImxe:n:tCaltaisosn::Manual::Component(3)
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NAME

6       DBIx::Class::Manual::Component - Developing DBIx::Class Components
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WHAT IS A COMPONENT

9       A component is a module that can be added in to your DBIx::Class
10       classes to provide extra functionality. A good example is the PK::Auto
11       component which automatically retrieves primary keys that the database
12       itself creates, after the insert has happened.
13

USING

15       Components are loaded using the load_components() method within your
16       DBIx::Class classes.
17
18         package My::Thing;
19         use base qw( DBIx::Class::Core );
20         __PACKAGE__->load_components(qw/InflateColumn::DateTime TimeStamp/);
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22       Generally you do not want to specify the full package name of a
23       component, instead take off the DBIx::Class:: part of it and just
24       include the rest.  If you do want to load a component outside of the
25       normal namespace you can do so by prepending the component name with a
26       +.
27
28         __PACKAGE__->load_components(qw/ +My::Component /);
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30       Once a component is loaded all of its methods, or otherwise, that it
31       provides will be available in your class.
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33       The order in which is you load the components may be very important,
34       depending on the component. If you are not sure, then read the docs for
35       the components you are using and see if they mention anything about the
36       order in which you should load them.
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CREATING COMPONENTS

39       Making your own component is very easy.
40
41         package DBIx::Class::MyComp;
42         use base qw(DBIx::Class);
43         # Create methods, accessors, load other components, etc.
44         1;
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46       When a component is loaded it is included in the calling class'
47       inheritance chain using Class::C3.  As well as providing custom utility
48       methods, a component may also override methods provided by other core
49       components, like DBIx::Class::Row and others.  For example, you could
50       override the insert and delete methods.
51
52         sub insert {
53           my $self = shift;
54           # Do stuff with $self, like set default values.
55           return $self->next::method( @_ );
56         }
57
58         sub delete {
59           my $self = shift;
60           # Do stuff with $self.
61           return $self->next::method( @_ );
62         }
63
64       Now, the order that a component is loaded is very important.
65       Components that are loaded first are the first ones in the inheritance
66       stack.  So, if you override insert() but the DBIx::Class::Row component
67       is loaded first then your insert() will never be called, since the
68       DBIx::Class::Row insert() will be called first.  If you are unsure as
69       to why a given method is not being called try printing out the current
70       linearized MRO.
71
72         print join ', ' => mro::get_linear_isa('YourClass::Name');
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EXISTING COMPONENTS

75   Extra
76       These components provide extra functionality beyond basic functionality
77       that you can't live without.
78
79       DBIx::Class::CDBICompat - Class::DBI Compatibility layer.
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81       DBIx::Class::FormTools - Build forms with multiple interconnected
82       objects.
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84       DBIx::Class::HTMLWidget - Like FromForm but with DBIx::Class and
85       HTML::Widget.
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87       DBIx::Class::Ordered - Modify the position of objects in an ordered
88       list.
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90       DBIx::Class::PK::Auto - Retrieve automatically created primary keys
91       upon insert.
92
93       DBIx::Class::QueriesTime - Display the amount of time it takes to run
94       queries.
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96       DBIx::Class::RandomStringColumns - Declare virtual columns that return
97       random strings.
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99       DBIx::Class::UUIDColumns - Implicit UUID columns.
100
101       DBIx::Class::WebForm - CRUD methods.
102
103   Experimental
104       These components are under development, their interfaces may change,
105       they may not work, etc.  So, use them if you want, but be warned.
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107       DBIx::Class::Validation - Validate all data before submitting to your
108       database.
109
110   Core
111       These are the components that all, or nearly all, people will use
112       without even knowing it.  These components provide most of DBIx::Class'
113       functionality.
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115       DBIx::Class::Core - Loads various components that "most people" would
116       want.
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118       DBIx::Class::AccessorGroup - Lets you build groups of accessors.
119
120       DBIx::Class::DB - Non-recommended classdata schema component.
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122       DBIx::Class::InflateColumn - Automatically create objects from column
123       data.
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125       DBIx::Class::PK - This class contains methods for handling primary keys
126       and methods depending on them.
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128       DBIx::Class::Relationship - Inter-table relationships.
129
130       DBIx::Class::ResultSourceProxy::Table - Provides a classdata table
131       object and method proxies.
132
133       DBIx::Class::Row - Basic row methods.
134

SEE ALSO

136       DBIx::Class::Manual::Cookbook
137

FURTHER QUESTIONS?

139       Check the list of additional DBIC resources.
140

142       This module is free software copyright by the DBIx::Class (DBIC)
143       authors. You can redistribute it and/or modify it under the same terms
144       as the DBIx::Class library.
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148perl v5.34.0                      2022-01-21 DBIx::Class::Manual::Component(3)
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