Add a warning in the RMD report when some rows are lost after merging Diff and Fatures tables

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - [[#345](https://github.com/nf-core/differentialabundance/pull/345)] - Plot differentially expressed genes by gene biotype ([@atrigila](https://github.com/atrigila), review by [@grst](https://github.com/grst))
 - [[#343](https://github.com/nf-core/differentialabundance/pull/343)] - Add pipeline-level nf-tests ([@atrigila](https://github.com/atrigila), review by [@pinin4fjords](https://github.com/pinin4fjords) and [@nschcolnicov](https://github.com/nschcolnicov))
 - [[#286](https://github.com/nf-core/differentialabundance/pull/286)] - Integration of limma voom for rnaseq data ([@KamilMaliszArdigen](https://github.com/KamilMaliszArdigen), review by [@pinin4fjords](https://github.com/pinin4fjords))
+- [[#354](https://github.com/nf-core/differentialabundance/pull/354)] - Warning message within the R Markdown report to control when genes don't have annotation data ([@alanmmobbs93](https://github.com/alanmmobbs93)). Review by [@WackerO](https://github.com/WackerO) and [@pinin4fjords](https://github.com/pinin4fjords).
 
 ### Fixed
 

assets/differentialabundance_report.Rmd

@@ -370,10 +370,13 @@ differential_files <- lapply(contrasts$id, function(d){
     file.path(params$input_dir, paste0(gsub(' |;', '_', d), differential_file_suffix))
 })
 
-differential_results <- lapply(differential_files, function(diff_file){
-    if (! file.exists(diff_file)){
-        stop(paste("Differential file", diff_file, "does not exist"))
-    }
+# Initialize vector to store warning messages before merging tables
+warnings_list <- c()
+
+# Read differential results and merge with features table
+results <- lapply(differential_files, function(diff_file) {
+    if (!file.exists(diff_file)) stop(paste("Differential file", diff_file, "does not exist"))
+
     diff <- read_differential(
         diff_file,
         feature_id_column = params$differential_feature_id_column,
@@ -382,19 +385,49 @@ differential_results <- lapply(differential_files, function(diff_file){
         qval_column = params$differential_qval_column
     )
 
-    # If fold changes are not logged already, log them (we assume they're logged
-    # later on)
-
-    if (! params$differential_foldchanges_logged){
+    # Log transform fold changes if not already logged
+    if (!params$differential_foldchanges_logged) {
         diff[[params$differential_fc_column]] <- log2(diff[[params$differential_fc_column]])
     }
 
-    # Annotate differential tables if possible
-    if (! is.null(params$features)){
-        diff <- merge(features, diff, by.x = params$features_id_col, by.y = params$differential_feature_id_column)
+    # Annotate differential table if features table is provided
+    if (!is.null(params$features)) {
+        ## Merge Differential expression table on features table
+        merged <- merge(features, diff, by.x = params$features_id_col, by.y = params$differential_feature_id_column)
+
+        ## Get number of missing rows
+        n_missing <- length(setdiff(diff[[params$differential_feature_id_column]], merged[[params$features_id_col]]))
+
+        ## Create warnings if necessary
+        warnings <- c(
+            ## Missing IDs
+            if (n_missing > 0) sprintf(
+                '<p style="color:#DAA520;"><strong>WARNING:</strong> %d IDs from the differential table (%s) were lost on merge with features table (%s).</p>',
+                n_missing, basename(diff_file), basename(params$features)
+            ),
+            ## Check whether there are fewer rows, missing data
+            if (nrow(merged) < nrow(diff)) sprintf(
+                '<p style="color:#DAA520;"><strong>WARNING:</strong> Rows were lost on merge (%s -> %s). Original: %d, Merged: %d.</p>',
+                basename(diff_file), basename(params$features), nrow(diff), nrow(merged)
+            ),
+            ## Check whether there are more rows, possible duplications
+            if (nrow(merged) > nrow(diff)) sprintf(
+                '<p style="color:#DAA520;"><strong>WARNING:</strong> Rows were duplicated on merge (%s -> %s). Original: %d, Merged: %d.</p>',
+                basename(diff_file), basename(params$features), nrow(diff), nrow(merged)
+            )
+        )
+    } else {
+        merged <- diff
+        warnings <- character(0)
     }
-    diff
+    ## Collect results
+    list(diff_features = merged, warnings = warnings)
 })
+
+# Separate differential_results and warnings_list from results
+differential_results <- lapply(results, `[[`, "diff_features")
+warnings_list <- unlist(lapply(results, `[[`, "warnings"))
+
 names(differential_results) <- contrasts$id
 ```
 
@@ -787,7 +820,6 @@ foo <- lapply(names(p_value_types), function(pvt){
 ```
 
 ```{r, echo=FALSE, results='asis', eval = FALSE}
-
 differential_summary_string <- paste(
     paste(
     lapply(
@@ -806,7 +838,13 @@ cat(differential_summary_string)
 
 ### Differential `r params$features_type` details
 
-```{r, echo=FALSE, results='asis'}
+```{r, echo=FALSE, results='asis', warning=FALSE, message=FALSE}
+
+# Display all warnings related to number of rows
+if (length(warnings_list) > 0) {
+    for (warning in warnings_list) { cat(warning) }
+}
+
 for (i in 1:nrow(contrasts)){
     cat("\n#### ", contrast_descriptions[i], "  {.tabset}\n")