Add a new farm_fields_dynamic module to standardize the creation of dynamic fields.

modules/farm/farm_fields/farm_fields_dynamic/farm_fields_dynamic.api.php

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+<?php
+
+/**
+ * @file
+ * Hooks provided by farm_fields_dynamic.
+ *
+ * This file contains no working PHP code; it exists to provide additional
+ * documentation for doxygen as well as to document hooks in the standard
+ * Drupal manner.
+ */
+
+/**
+ * @defgroup farm_fields_dynamic Farm dynamic field module integrations.
+ *
+ * Module integrations with the farm_fields_dynamic module.
+ */
+
+/**
+ * @defgroup farm_fields_dynamic_hooks Farm dynamic field's hooks
+ * @{
+ * Hooks that can be implemented by other modules in order to extend farm_fields_dynamic.
+ */
+
+/**
+ * Define dynamic field bases.
+ *
+ * @return array
+ *   An array of field base definitions, keyed by field name.
+ */
+function hook_farm_fields_dynamic_bases() {
+  return array(
+    'my_field' => array(
+      // ...
+    ),
+  );
+}
+
+/**
+ * Define dynamic field instances.
+ *
+ * @return array
+ *   An array of field instance definitions.
+ */
+function hook_farm_fields_dynamic_instances() {
+  return array(
+    array(
+      // ...
+    ),
+  );
+}
+
+/**
+ * @}
+ */

modules/farm/farm_fields/farm_fields_dynamic/farm_fields_dynamic.info

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+name = Farm Fields Dynamic
+description = Provides the ability for modules to define fields dynamically.
+core = 7.x
+package = farmOS
+dependencies[] = field

modules/farm/farm_fields/farm_fields_dynamic/farm_fields_dynamic.install

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+<?php
+
+/**
+ * @file
+ * Farm fields dynamic install.
+ */
+
+/**
+ * Implements hook_install().
+ */
+function farm_fields_dynamic_install() {
+
+  // When this module is installed, create dynamic field bases and instances (if
+  // necessary).
+  farm_fields_dynamic_base_create();
+  farm_fields_dynamic_instances_create();
+}
+
+/**
+ * Implements hook_modules_installed().
+ */
+function farm_fields_dynamic_modules_installed() {
+
+  // When another module is installed, create dynamic field bases and instances
+  // (if necessary).
+  farm_fields_dynamic_base_create();
+  farm_fields_dynamic_instances_create();
+}
+
+/**
+ * Create data field base.
+ */
+function farm_fields_dynamic_base_create() {
+
+  // Load field types.
+  $field_types = field_info_fields();
+
+  // Get dynamic field base definitions.
+  $dynamic_field_bases = module_invoke_all('farm_fields_dynamic_bases');
+
+  // Iterate through the field base definitions.
+  foreach ($dynamic_field_bases as $field_base) {
+
+    // If the field name is not available, skip it.
+    if (!empty($field_base['field_name'])) {
+      $field_name = $field_base['field_name'];
+    }
+    else {
+      continue;
+    }
+
+    // If the field base already exists, skip it.
+    if (!empty($field_types[$field_name])) {
+      continue;
+    }
+
+    // Create the field base.
+    field_create_field($field_base);
+  }
+}
+
+/**
+ * Create data field instances.
+ */
+function farm_fields_dynamic_instances_create() {
+
+  // Load existing field instances.
+  $field_instances = field_info_instances();
+
+  // Get dynamic field instance definitions.
+  $dynamic_field_instances = module_invoke_all('farm_fields_dynamic_instances');
+
+  // Iterate through the dynamic field instances.
+  foreach ($dynamic_field_instances as $field_instance) {
+
+    // If the entity type, bundle, or field name are not available, bail.
+    if (!empty($field_instance['entity_type']) && !empty($field_instance['bundle']) && !empty($field_instance['field_name'])) {
+      $entity_type = $field_instance['entity_type'];
+      $bundle = $field_instance['bundle'];
+      $field_name = $field_instance['field_name'];
+    }
+    else {
+      continue;
+    }
+
+    // If the instance already exists, skip it.
+    if (!empty($field_instances[$entity_type][$bundle][$field_name])) {
+      continue;
+    }
+
+    // Create the field instance.
+    field_create_instance($field_instance);
+  }
+}

modules/farm/farm_fields/farm_fields_dynamic/farm_fields_dynamic.module

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+<?php
+
+/**
+ * @file
+ * Farm fields dynamic module.
+ */