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Next, for the many-to-many mapping between the authors and books, add the has_and_belongs_to_many mapping to app/models/book.rb as follows: class Book < ActiveRecord::Base has_and_belongs_to_many :authors belongs_to :publisher end

Figure 7-8. Visual Studio view of the new MfgComponentModel project, showing References and MfgComponentModel.m

Note ActiveRecord tries to guess the name of the join table, authors_books, by combining the two table names. In our example, ActiveRecord will look for a table named authors_books, not books_authors, since the string authors comes before books when compared in lexical order.

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One of the easiest ways to change the external data source is to create a connection to the new database and then change the data source for the pivot table so it uses the new connection. Now that you have the Excel file open, you ll create a new connection to the new Shipments database: 1. Select a cell outside the pivot table. If a cell inside the pivot table is active, you won t be able to select a new data source. 2. On the Ribbon, click the Data tab, and in the Get External Data group, click From Access. 3. In the Select Data Source dialog box, select the folder in which you saved the ShipmentsNew.accdb file, select the file, and click Open.

We also want to be able to access the books from the author s side of the relationship, so change app/models/author.rb as follows: class Author < ActiveRecord::Base has_and_belongs_to_many :books validates_presence_of :first_name, :last_name def name "#{first_name} #{last_name}" end end That takes care of the ActiveRecord mappings, but we also want to make sure only valid books are stored in the database. This can be done with validations, which we introduced in 2.

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4. In the Select Table dialog box, select ShipmentsByDate, which is the query you want to use, and click OK (see Figure 8-12).

How do you get from the model code shown in Figure 7-8 to the desired end shown in Figure 7-3 Let s work from the top down and add the two import declarations for Repository.Item and System (see Figure 7-9).

Before writing unit tests for the model, you should add some validations to the model. The Book model has quite a few attributes that should be validated, as listed in Table 3-5. Table 3-5. Validations on the Book Model

Figure 8-12. Select Table dialog box Although you want to continue to use your existing pivot table, you ll create a new pivot table temporarily to establish the new connection. Later, you ll delete this temporary pivot table. 5. In the Import Data dialog box, select PivotTable Report, select New Worksheet as the location for the pivot table, and then click OK.

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24 Sep 2015 ... Introduction. The purpose of this article is to create a simple class that will generate the image of a Code 39 barcode from a string as input.

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