Adds documentations for RelationshipSchemaGenerator

lib/schemable/relationship_schema_generator.rb

@@ -1,13 +1,35 @@
 module Schemable
+  # The RelationshipSchemaGenerator class is responsible for generating the 'relationships' part of a JSON:API compliant response.
+  # This class generates schemas for each relationship of a model, including 'belongs_to' (and has_many) and 'has_many' relationships.
+  #
+  # @see Schemable
   class RelationshipSchemaGenerator
     attr_reader :model_definition, :schema_modifier, :relationships
 
+    # Initializes a new RelationshipSchemaGenerator instance.
+    #
+    # @param model_definition [ModelDefinition] The model definition to generate the schema for.
+    #
+    # @example
+    #   generator = RelationshipSchemaGenerator.new(model_definition)
     def initialize(model_definition)
       @model_definition = model_definition
       @schema_modifier = SchemaModifier.new
       @relationships = model_definition.relationships
     end
 
+    # Generates the 'relationships' part of the JSON:API response.
+    # It iterates over each relationship type (belongs_to, has_many) and for each relationship,
+    # it prepares a schema unless the relationship is excluded from expansion.
+    # If the 'expand' option is true, it changes the schema to include type and id properties inside the 'meta' property.
+    #
+    # @param relationships_to_exclude_from_expansion [Array] The relationships to exclude from expansion.
+    # @param expand [Boolean] Whether to include the relationships of the related resource in the schema.
+    #
+    # @example
+    #   schema = generator.generate(expand: true, relationships_to_exclude_from_expansion: [:some_relationship])
+    #
+    # @return [Hash] The generated schema.
     def generate(relationships_to_exclude_from_expansion: [], expand: false)
       return {} if @relationships.blank? || @relationships == { belongs_to: {}, has_many: {} }
 
@@ -49,6 +71,18 @@ module Schemable
       schema
     end
 
+    # Generates the schema for a specific relationship.
+    # If the 'collection' option is true, it generates a schema for a 'has_many' relationship,
+    # otherwise it generates a schema for a 'belongs_to' relationship. The difference between the two is that
+    # 'data' is an array in the 'has_many' relationship and an object in the 'belongs_to' relationship.
+    #
+    # @param type_name [String] The type of the related resource.
+    # @param collection [Boolean] Whether the relationship is a 'has_many' relationship.
+    #
+    # @example
+    #   relationship_schema = generator.generate_schema('resource_type', collection: true)
+    #
+    # @return [Hash] The generated schema for the relationship.
     def generate_schema(type_name, collection: false)
       if collection
         {