Bugzilla::Object - A base class for objects in Bugzilla.
my $object = new Bugzilla::Object(1);
my $object = new Bugzilla::Object({name => 'TestProduct'});
my $id = $object->id;
my $name = $object->name;
Bugzilla::Object is a base class for Bugzilla objects. You never actually create a Bugzilla::Object directly, you only make subclasses of it.
Basically, Bugzilla::Object exists to allow developers to create objects more easily. All you have to do is define DB_TABLE, DB_COLUMNS, and sometimes LIST_ORDER and you have a whole new object.
You should also define accessors for any columns other than name or id.
Frequently, these will be the only things you have to define in your subclass in order to have a fully-functioning object. DB_TABLE and DB_COLUMNS are required.
DB_TABLEThe name of the table that these objects are stored in. For example, for Bugzilla::Keyword this would be keyworddefs.
DB_COLUMNSThe names of the columns that you want to read out of the database and into this object. This should be an array.
NAME_FIELDThe name of the column that should be considered to be the unique "name" of this object. The 'name' is a string that uniquely identifies this Object in the database. Defaults to 'name'. When you specify {name = $name}> to new(), this is the column that will be matched against in the DB.
ID_FIELDThe name of the column that represents the unique integer ID of this object in the database. Defaults to 'id'.
LIST_ORDERThe order that new_from_list and get_all should return objects in. This should be the name of a database column. Defaults to "NAME_FIELD".
REQUIRED_CREATE_FIELDSThe list of fields that must be specified when the user calls create(). This should be an array.
VALIDATORSA hashref that points to a function that will validate each param to "create".
Validators are called both by "create" and "set". When they are called by "create", the first argument will be the name of the class (what we normally call $class).
When they are called by "set", the first argument will be a reference to the current object (what we normally call $self).
The second argument will be the value passed to "create" or "set"for that field.
The third argument will be the name of the field being validated. This may be required by validators which validate several distinct fields.
These functions should call "ThrowUserError" in Bugzilla::Error if they fail.
The validator must return the validated value.
UPDATE_COLUMNSA list of columns to update when "update" is called. If a field can't be changed, it shouldn't be listed here. (For example, the "ID_FIELD" usually can't be updated.)
new($param)The constructor is used to load an existing object from the database, by id or by name.
If you pass an integer, the integer is the id of the object, from the database, that we want to read in. (id is defined as the value in the "ID_FIELD" column).
If you pass in a hash, you can pass a name key. The value of the name key is the case-insensitive name of the object (from "NAME_FIELD") in the DB.
Additional Parameters Available for Subclasses
If you are a subclass of Bugzilla::Object, you can pass condition and values as hash keys, instead of the above.
condition is a set of SQL conditions for the WHERE clause, which contain placeholders.
values is a reference to an array. The array contains the values for each placeholder in condition, in order.
This is to allow subclasses to have complex parameters, and then to translate those parameters into condition and values when they call $self-SUPER::new> (which is this function, usually).
If you try to call new outside of a subclass with the condition and values parameters, Bugzilla will throw an error. These parameters are intended only for use by subclasses.
A fully-initialized object.
new_from_list(\@id_list) Description: Creates an array of objects, given an array of ids.
Params: \@id_list - A reference to an array of numbers, database ids.
If any of these are not numeric, the function
will throw an error. If any of these are not
valid ids in the database, they will simply
be skipped.
Returns: A reference to an array of objects.
createDescription: Creates a new item in the database. Throws a User Error if any of the passed-in params are invalid.
Params: $params - hashref - A value to put in each database field for this object. Certain values must be set (the ones specified in "REQUIRED_CREATE_FIELDS"), and the function will throw a Code Error if you don't set them.
Returns: The Object just created in the database.
Notes: In order for this function to work in your subclass, your subclass's "ID_FIELD" must be of SERIAL type in the database. Your subclass also must define "REQUIRED_CREATE_FIELDS" and "VALIDATORS".
Subclass Implementors: This function basically just
calls L</check_required_create_fields>, then
L</run_create_validators>, and then finally
L</insert_create_data>. So if you have a complex system that
you need to implement, you can do it by calling these
three functions instead of C<SUPER::create>.
check_required_create_fieldsPart of "create". Throws an error if any of the "REQUIRED_CREATE_FIELDS" have not been specified in $params
$params - The same as $params from "create".run_create_validatorsDescription: Runs the validation of input parameters for "create". This subroutine exists so that it can be overridden by subclasses who need to do special validations of their input parameters. This method is only called by "create".
Params: The same as "create".
Returns: A hash, in a similar format as $params, except that these are the values to be inserted into the database, not the values that were input to "create".
insert_create_dataPart of "create".
Takes the return value from "run_create_validators" and inserts the data into the database. Returns a newly created object.
updateSaves the values currently in this object to the database. Only the fields specified in "UPDATE_COLUMNS" will be updated, and they will only be updated if their values have changed.
A hashref showing what changed during the update. The keys are the column names from "UPDATE_COLUMNS". If a field was not changed, it will not be in the hash at all. If the field was changed, the key will point to an arrayref. The first item of the arrayref will be the old value, and the second item will be the new value.
If there were no changes, we return a reference to an empty hash.
These functions are intended only for use by subclasses. If you call them from anywhere else, they will throw a CodeError.
setSets a certain hash member of this class to a certain value. Used for updating fields. Calls the validator for this field, if it exists. Subclasses should use this function to implement the various set_ mutators for their different fields.
See "VALIDATORS" for more information.
$field - The name of the hash member to update. This should be the same as the name of the field in "VALIDATORS", if it exists there.
$value - The value that you're setting the field to.get_all Description: Returns all objects in this table from the database.
Params: none.
Returns: A list of objects, or an empty list if there are none.
Notes: Note that you must call this as C<$class->get_all>. For
example, C<Bugzilla::Keyword->get_all>.
C<Bugzilla::Keyword::get_all> will not work.