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Relations

Create relationships and link rows together.
Relations can be used in Jet Admin to create relationships between rows, linking together their data across tables.
The related field allows you to represent the relationships between related records by creating links between them. This is particularly helpful when you have multiple tables of related items. For instance, if you have a table of Customers and a table of Companies, you can use a related field to link each Customer row to the Company that they work for.

Single relations

Single relations show a one-to-one relationship. This is where one item relates to one other item.

Multiple relations

Multiple relations show a one-to-many relationship. This is where one item relates to a list of other items.

How to create relations in Jet Admin

In Jet, you can create relations between values using a Link to record column. With this column, you specify the type of relation you want - single or multiple. Your project then applies the relation to the values and tables specified.

Check for matching values

Before adding a Relation column, you must first check that the values match in the columns that will be connected. Items cannot be linked together unless they match.
In this example, each employee in Contact has a Company they work in.
  1. 1.
    In the Contact table, make sure there’s a column for the name of the employee’s Company.
  2. 2.
    In the Company table, make sure there’s a column for the name of the location that can be tied to the Contact table.

Build single relations

Here we'll show how to simply create a related Company field for each Customer. Each customer has company_id, to display and link the company in the Customer table let's specify link to record. There are 3 steps to setting up a related field:
1. Specify the type for a company_id column as Link to record
2. Specify related collection then select related field and select Display field to display it on the Customer table:
Related field and Display field are set automatically under the context but you can change these values.

Multiple relations

One record in a table might be connected to many records in another table. For example, I might have a table with my customers and another table with my sales data, and each customer might have multiple orders.
With Jet Admin, you can use this kind of connection to display or work with the connected records that you want.
Example: Create a table that will show all the orders from the customer selected in the customers table.
  1. 1.
    Add a new table and select the resource with the records you want to display. In this case, the table will be with the sales records.
  2. 2.
    Add a filter to the table. You can do this when adding the table, or afterward in the table menu.
  3. 3.
    Choose the related fields and the method of filtering. In this case, the field will be Customer ID and the method, in this case Customer ID equals.
  4. 4.
    Next, select the component and field that you want to use to filter. In this example, that will be the ID field from the Customers table.
  5. 5.
    Lastly, customize the table to suit your needs. In this case, I'll customize the fields and also change the name of the table to show the customer name (which can be done by using the concatenate function in the display field – "CONCAT("Purchases by", [select Name using the formula menu])
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