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- Created by Dominika Kurek, last modified on May 06, 2016
In the following recipes, you will see how to create Content, including complex fields like XmlText or Image.
Identifying to the repository with a login and a password
As seen earlier, the Repository executes operations with a user's credentials. In a web context, the currently logged-in user is automatically identified. In a command line context, you need to manually log a user in. We have already seen how to manually load and set a user using its ID. If you would like to identify a user using their username and password instead, this can be achieved in the following way:
Creating content
We will now see how to create Content using the Public API. This example will work with the default Folder (ID 1) Content Type from eZ Platform.
We first need the required services. In this case: ContentService, LocationService and ContentTypeService.
The ContentCreateStruct
As explained in eZ Platform Public PHP API, Value Objects are read only. Dedicated objects are provided for Update and Create operations: structs, like ContentCreateStruct or UpdateCreateStruct. In this case, we need to use a ContentCreateStruct.
We first need to get the ContentType we want to create a Content with. To do so, we use ContentTypeService::loadContentTypeByIdentifier() , with the wanted ContentType identifier, like 'article'. We finally get a ContentTypeCreateStruct using ContentService::newContentCreateStruct() , providing the Content Type and a Locale Code (eng-GB).
Setting the fields values
Using our create struct, we can now set the values for our Content item's Fields, using the setField() method. For now, we will just set the title. setField() for a TextLine Field simply expects a string as input argument. More complex Field Types, like Author or Image, expect different input values.
The
ContentCreateStruct::setField()
method can take several type of arguments.
In any case, whatever the Field Type is, a Value of this type can be provided. For instance, a TextLine\Value can be provided for a TextLine\Type. Depending on the Field Type implementation itself, more specifically on the fromHash() method every Field Type implements, various arrays can be accepted, as well as primitive types, depending on the Type.
Setting the Location
In order to set a Location for our object, we must instantiate a LocationCreateStruct . This is done with LocationService::newLocationCreateStruct(), with the new Location's parent ID as an argument.
Creating and publishing
To actually create our Content in the Repository, we need to use ContentService::createContent(). This method expects a ContentCreateStruct, as well as a LocationCreateStruct. We have created both in the previous steps.
The LocationCreateStruct is provided as an array, since a Content item can have multiple locations.
createContent()returns a new Content Value Object, with one version that has the DRAFT status. To make this Content visible, we need to publish it. This is done using ContentService::publishVersion(). This method expects a VersionInfo object as its parameter. In our case, we simply use the current version from $draft, with the versionInfo property.
Updating Content
We will now see how the previously created Content can be updated. To do so, we will create a new draft for our Content, update it using a ContentUpdateStruct , and publish the updated Version.
To create our draft, we need to load the Content item's ContentInfo using ContentService::loadContentInfo(). We can then use ContentService::createContentDraft() to add a new Draft to our Content.
To set the new values for this version, we request a ContentUpdateStruct from the ContentService using the newContentUpdateStruct() method. Updating the values hasn't changed: we use the setField() method.
We can now use ContentService::updateContent() to apply our ContentUpdateStruct to our draft's VersionInfo. Publishing is done exactly the same way as for a new content, using ContentService::publishVersion().
Handling translations
In the two previous examples, you have seen that we set the ContentUpdateStruct's initialLanguageCode property. To translate an object to a new language, set the locale to a new one.
It is possible to create or update content in multiple languages at once. There is one restriction: only one language can be set a version's language. This language is the one that will get a flag in the back office. However, you can set values in other languages for your attributes, using the setField method's third argument.
Since we don't specify a locale for the last two fields, they are set for the UpdateStruct's initialLanguageCode, fre-FR.
Creating Content containing an image
As explained above, the setField() method can accept various values: an instance of the Field Type's Value class, a primitive type, or a hash. The last two depend on what the Type::acceptValue() method is build up to handle. TextLine can, for instance, accept a simple string as an input value. In this example, you will see how to set an Image value.
We assume that we use the default image class. Creating our Content, using the Content Type and a ContentCreateStruct, has been covered above, and can be found in the full code. Let's focus on how the image is provided.
This time, we create our image by directly providing an Image\Value object. The values are directly provided to the constructor using a hash with predetermined keys that depend on each Type. In this case: the path where the image can be found, its size, the file name, and an alternative text.
Images also implement a static fromString() method that will, given a path to an image, return an Image\Value object.
But as said before, whatever you provide setField() with is sent to the acceptValue() method. This method really is the entry point to the input formats a Field Type accepts. In this case, you could have provided setField with either a hash, similar to the one we provided the Image\Value constructor with, or the path to your image, as a string.
Create Content with XML Text
Full code
Another very commonly used Field Type is the rich text one, XmlText.
As for the last example above, we use the multiple formats accepted by setField(), and provide our XML string as is. The only accepted format as of 5.0 is internal XML, the one stored in the Legacy database.
The XSD for the internal XML representation can be found in the kernel: https://github.com/ezsystems/ezpublish-kernel/blob/master/eZ/Publish/Core/FieldType/XmlText/Input/Resources/schemas/ezxml.xsd.
We embed an image in our XML, using the <embed> tag, providing an image Content ID as the object_id attribute.
Using a custom format as input
More input formats will be added later. The API for that is actually already available: you simply need to implement the XmlText\Input interface. It contains one method, getInternalRepresentation() , that must return an internal XML string. Create your own bundle, add your implementation to it, and use it in your code!
Deleting Content
ContentService::deleteContent() method expects a ContentInfo as an argument. It will delete the given Content item, all of its Locations, as well as all of the Content item's Locations' descendants and their associated Content.