add a class diagramme for the shoppingcartposition

docs/pictures/class_shoppingcartposition.dot

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+digraph model_graph {
+  // Dotfile by Django-Extensions graph_models
+  // Created: 2018-01-29 22:04
+  // Cli Options: -a
+
+  fontname = "Helvetica"
+  fontsize = 8
+  splines  = true
+
+  node [
+    fontname = "Helvetica"
+    fontsize = 8
+    shape = "plaintext"
+  ]
+
+  graph [ dpi = 300 ];
+
+  edge [
+    fontname = "Helvetica"
+    fontsize = 8
+  ]
+
+  // Labels
+  webshop_models_ShoppingCartPosition [label=<
+    <TABLE BGCOLOR="palegoldenrod" BORDER="0" CELLBORDER="0" CELLSPACING="0">
+    <TR><TD COLSPAN="2" CELLPADDING="4" ALIGN="CENTER" BGCOLOR="olivedrab4">
+    <FONT FACE="Helvetica Bold" COLOR="white">
+    ShoppingCartPosition
+    </FONT></TD></TR>
+
+    <TR><TD ALIGN="LEFT" BORDER="0">
+    <FONT FACE="Helvetica Bold">id</FONT>
+    </TD><TD ALIGN="LEFT">
+    <FONT FACE="Helvetica Bold">AutoField</FONT>
+    </TD></TR>
+
+    <TR><TD ALIGN="LEFT" BORDER="0">
+    <FONT FACE="Helvetica Bold">article</FONT>
+    </TD><TD ALIGN="LEFT">
+    <FONT FACE="Helvetica Bold">ForeignKey (id)</FONT>
+    </TD></TR>
+
+    <TR><TD ALIGN="LEFT" BORDER="0">
+    <FONT FACE="Helvetica Bold">order</FONT>
+    </TD><TD ALIGN="LEFT">
+    <FONT FACE="Helvetica Bold">ForeignKey (id)</FONT>
+    </TD></TR>
+
+    <TR><TD ALIGN="LEFT" BORDER="0">
+    <FONT FACE="Helvetica ">amount</FONT>
+    </TD><TD ALIGN="LEFT">
+    <FONT FACE="Helvetica ">FloatField</FONT>
+    </TD></TR>
+
+    <TR><TD ALIGN="LEFT" BORDER="0">
+    <FONT FACE="Helvetica ">price_in_chf</FONT>
+    </TD><TD ALIGN="LEFT">
+    <FONT FACE="Helvetica ">DecimalField</FONT>
+    </TD></TR>
+
+    </TABLE>
+    >]
+}