Add a CSV export functionality in admin and add price fields (#41)

* Implement an action do download data in csv
* Refactor CSV download
* Move price to main models and add csv to bookshelf
* Update template and API
* Small refactoring

ram/ram/__init__.py

@@ -1,4 +1,4 @@
 from ram.utils import git_suffix
 
-__version__ = "0.14.3"
+__version__ = "0.15.0"
 __version__ += git_suffix(__file__)

ram/ram/settings.py

@@ -170,6 +170,9 @@ SITE_NAME = "Railroad Assets Manger"
 # The file must be placed in the root of the 'static' folder
 DEFAULT_CARD_IMAGE = "coming_soon.svg"
 
+CSV_SEPARATOR = ","
+CSV_SEPARATOR_ALT = ";"
+
 DECODER_INTERFACES = [
     (0, "Built-in"),
     (1, "NEM651"),

ram/ram/utils.py

@@ -1,7 +1,10 @@
 import os
+import csv
 import hashlib
 import subprocess
 
+from django.conf import settings
+from django.http import HttpResponse
 from django.utils.html import format_html
 from django.utils.text import slugify as django_slugify
 from django.core.files.storage import FileSystemStorage
@@ -57,3 +60,15 @@ def slugify(string, custom_separator=None):
     if custom_separator is not None:
         string = string.replace("-", custom_separator)
     return string
+
+
+def generate_csv(header, data, filename, separator=settings.CSV_SEPARATOR):
+    response = HttpResponse(content_type="text/csv")
+    response["Content-Disposition"] = 'attachment; filename="{}"'.format(
+        filename
+    )
+    writer = csv.writer(response)
+    writer.writerow(header)
+    for row in data:
+        writer.writerow(row)
+    return response