Propel: Call to a member function XXXX on a non-object
Want to write down a simple trick I use to avoid errors like the subject says.
Let’s take we have described tables in our schema.xml:
Listing 1
1 2 3 4 5 6 7 8 9 10 11 12 13 | <table name="User" phpName="User" idMethod="native"> <column name="id" phpName="Id" peerName="ID" type="INTEGER" required="true" autoIncrement="true" primaryKey="true"></column> <column name="username" phpName="UserName" peerName="USERNAME" type="VARCHAR" size="32" required="true" default=""></column> <column name="state_id" phpName="StateId" peerName="STATEID" type="INTEGER" required="true" default="0"></column> <foreign-key foreignTable="State"> <reference local="state_id" foreign="id"/> </foreign-key> </table> <table name="State" phpName="State" idMethod="native"> <column name="id" phpName="Id" peerName="ID" type="INTEGER" required="true" autoIncrement="true" primaryKey="true"></column> <column name="state_name" phpName="StateName" peerName="NAME" type="CHAR" size="25" required="true" default=""></column> </table> |
Thanx to relation definition in lines 5-7 we can do a call like this:
Listing 2
1 2 | // assuming $user is a valid instance of User echo $user->getState()->getStateName(); |
But what happens if a certain user has no `state_id` set for some reason? We’ll get the message: Error: Call to a member function getName() on a non-object…
(Obviously as $user->getState() doesn’t produce a correct State instance without `state_id`)
In case `state_id` isn’t something nitty-gritty in our application we can extend our User class with the following:
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