26 Août 2016 à 06h00 - 3020 vues

How to create a join table with ROR ?

Companies need to create powerful websites in order to ensure interaction with the web world. Good numbers of tools are used to achieve this aim as ruby ​​on rails, which is one of the most quoted tools lately. Specifically, in the case of this tool, the benefits will be many and explain the excitement of its use. Creating a join table is one of the possibilities offered by Ruby on Rails. It will be important to know the inner workings in order to achieve good results, of course.

Joining tables: concept

A ruby ​​on rails developer can easily join the tables with this tool. Clearly, the table join will add fields from one table to another. All based on a common attribute to both tables. It will be possible to specifically define the join based on this or these attributes or based on a predefined geodatabase relationship class or on location which is also called spatial join. Note that only the relationship class will be displayed if the geodatabase data is attached with a relationship class already defined in the geodatabase. Also, do table join several layers possible and classes joints can easily be mixed with joins attributes. It goes without saying that when a table to join has been erased, data tables joined with it will also be deleted.

The approach

During the process, will begin with the organization of data. To do this will require a summary of the data in the table to join with a table layer. Thereafter, when the joining process, with ruby ​​on rails, there are several solutions that can be easily adopted. Above all, it will be possible to use the select. This will return a table of elements Active Record. The second solution is to use SQL, which also returns an array elements Active Record. Of course, there is another solution which will be based on the method along. The only problem with the latter solution is the fact that the results obtained by this method are often read-only with the relationship. This fact could therefore easily cause problems.

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