public GenericRequestBuilder<ModelType, DataType, ResourceType, TranscodeType> load(ModelType model) {
        this.model = model;
        isModelSet = true;
        return this;
    }
Sets the specific model to load data for.

<p>
     This method must be called at least once before {@link #into(Target)} is
     called.
</p>

@param model The model to load data for, or null.
@return This request builder.
core/src/main/java/com/bumptech/glide/GenericRequestBuilder.java