You can debug a gcamdata chunk as you would normally debug any function, using breakpoints or the browser() function (see here for more explanation) However, users may find it easier to debug by running a gcamdata chunk line by line. This can be achieved by running driver or driver_drake and saving the inputs of a chunk to all_data, and then begin running your chunk from loading the inputs. If stop_before is specified, by default that chunk’s inputs are returned. If stop_after is specified, that chunk’s outputs are returned.
For example, if you run:
all_data <- driver(stop_before = "module_emissions_L121.nonco2_awb_R_S_T_Y")
All inputs of module_emissions_L121.nonco2_awb_R_S_T_Y will be saved to all_data. From there, you can run get_data(all_data, <input-name>) or alternatively begin running your chunk line by line, starting with loading required inputs.
Similarly, if you are using driver_drake you can do
all_data <- driver_drake(stop_before = "module_emissions_L121.nonco2_awb_R_S_T_Y")
which also saves the inputs to all_data.
We have also provided a utility method load_from_cache() for returning input or output data in the same format as data returned from driver(stop_before = "module_emissions_L121.nonco2_awb_R_S_T_Y"), which looks like
all_data <- load_from_cache(inputs_of("module_emissions_L121.nonco2_awb_R_S_T_Y"))
We recommend using this utility rather than using drake::readd directly.
Additionally, you likely will need to load the package with devtools::load_all() so that all necessary functions are available at the command line. Remember to reload after making changes.