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Field context ============= Field context module provides a way for developers to reference field instances in abstract terms rather than actual field names, allowing you to write a future-proof code in cases where exact field names need to be known. You only need to enabled it if a module depends on it or if you want to integrate it in your own development. Installation ------------ Install it just like any other Drupal module - place it in the modules directory for your site and enable it on the "admin/modules" page. Usage ----- Note: Although Field context does not have a hard dependency on Field UI module, you have to enable Field UI (field_ui) module in order to be able to set contexts for fields via user interface. A field context can be set in the form that adds or edits field instances for any bundle of any entity. ### Nodes If you wish to add field contexts for node fields: 1. Go to Structure > Content types section of the site (admin/structure/types). 2. Click on "manage fields" link for the content type of your choice. 3. If you do not have defined fields, add a field and select a field context in the "Field context" section of the field edit form. 4. If you want to add a field context for existing field, click on "edit" link for selected field and select a field context in the "Field context" section of the field edit form. ### Users If you wish to add field contexts for user fields: 1. Go to Configuration > Account settings section of the site (admin/config/people/accounts). 2. Click on "Manage fields" tab. 3. Select field contexts the same way you would do for node fields. Predefined contexts ------------------- For user convenience developers can predefine contexts using hooks so that users can select field contexts using drop-down list with predefined context options. See fieldcontext.api.php file for examples and documentation. Integration with Features ------------------------- All field contexts associated with field instances are automatically included in field instance settings when they are exported via Features. Integration with Rules ---------------------- The module provides a Rules condition to determine whether an entity has a field with a particular context and an action to fetch the field name with a specified context. Use case -------- Your client wants to have a website that lists his paintings and drawings, with all paintings and drawings with price over € 1000 promoted to the front page automatically. Your client also wants to be able to add different types of art in the future himself and also have them promoted to the front page using the same price threshold. As a developer, you do the following: 1. Create two node content types: Painting and Drawing. 2. Add a field "Price" (field_painting_price) that is attached to Painting content type, and assign "price" context to the field. 3. Add a field "Price" (field_drawing_price) that is attached to Drawing content type, and assign "price" context to the field. 4. Create a hook that sets $node->promote to 1 upon node saving if the field value with "price" context is greater that 1000. 5. Instruct your client that when he creates a Sculpture node content type and adds a field "Price" (field_oh_thisis_f0r_price_right) to the Sculpture content type himself in the future, he merely needs to select "Price" context for the field in order to have expensive sculptures promoted to the front page. Test cases ---------- The module contains a sub-module "Field context Test" that provides sample data for Field context module test cases. It is required by test cases that are included in fieldcontext.test file.
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