Why does containter's dsl object return null for properties?

Old Forum Archive
5

Thanks for quick replay I think my last example was really unfortunate and didn’t present what I am trying to achieve. Hopefully this one will present the problem that I am struggling with.

apply plugin: DocumentationPlugin
  publisher {
    info {
        name 'Publisher'
    }
    books {
        quickStart {
            title = 'Quick Start'
        }
        userGuide {
            title = 'User Guide'
        }
        developerGuide {
            title = 'Developer Guide'
        }
    }
}
  class DocumentationPlugin implements Plugin<Project> {
    void apply(Project project) {
        def publisher = project.extensions.create('publisher', Publisher)
        def publisherInfo = publisher.extensions.create('info', PublisherInfo)
        def books = project.container(Book)
        books.all { book ->
            println "Creating task $book.name -> Title: $book.title, "
            project.tasks.create("displayBook${book.name.capitalize()}", DisplayBook) {
                publisherName = publisherInfo.name
                title = book.title
            }
        }
        publisher.extensions.books = books
    }
}
class PublisherInfo {
    String name
}
  class Publisher {
  }
  class Book {
    final String name
    String title
      Book(String name) {
        this.name = name
    }
}
  class DisplayBook extends DefaultTask {
      String publisherName
    String title
      @TaskAction
    def displayBook() {
        println "$name -> Title: $title, Publisher : $publisherName"
    }
}

I am trying to create a task that will use DSL to sets itself. Based on the DSL also it will create a list of the tasks. If you run following code you will get following list of the tasks:

displayBookDeveloperGuide
displayBookQuickStart
displayBookUserGuide

Now this is what I am struggling with and what I am expecting to get after running e.g. displayBookDeveloperGuide

// Expected
 displayBookDeveloperGuide -> Title: Developer Guide, Publisher : Publisher

But what I am actually getting is:

// This is what happens title is not set
 displayBookDeveloperGuide -> Title: null, Publisher : Publisher

Hopefully this example presents the problem better.