custom columns: add Float type support

- remove float datatype from cc_exceptions
- handle float datatype like int or bool
- change edit template to modify input step (0.01 precision, like
  in calibre UI)

cps/db.py

@@ -25,13 +25,13 @@ import ast
 
 from sqlalchemy import create_engine
 from sqlalchemy import Table, Column, ForeignKey
-from sqlalchemy import String, Integer, Boolean, TIMESTAMP
+from sqlalchemy import String, Integer, Boolean, TIMESTAMP, Float
 from sqlalchemy.orm import relationship, sessionmaker, scoped_session
 from sqlalchemy.ext.declarative import declarative_base
 
 
 session = None
-cc_exceptions = ['datetime', 'comments', 'float', 'composite', 'series']
+cc_exceptions = ['datetime', 'comments', 'composite', 'series']
 cc_classes = {}
 engine = None
 
@@ -378,6 +378,11 @@ def setup_db(config):
                               'id': Column(Integer, primary_key=True),
                               'book': Column(Integer, ForeignKey('books.id')),
                               'value': Column(Integer)}
+                elif row.datatype == 'float':
+                    ccdict = {'__tablename__': 'custom_column_' + str(row.id),
+                              'id': Column(Integer, primary_key=True),
+                              'book': Column(Integer, ForeignKey('books.id')),
+                              'value': Column(Float)}
                 else:
                     ccdict = {'__tablename__': 'custom_column_' + str(row.id),
                               'id': Column(Integer, primary_key=True),
@@ -385,7 +390,7 @@ def setup_db(config):
                 cc_classes[row.id] = type(str('Custom_Column_' + str(row.id)), (Base,), ccdict)
 
         for cc_id in cc_ids:
-            if (cc_id[1] == 'bool') or (cc_id[1] == 'int'):
+            if (cc_id[1] == 'bool') or (cc_id[1] == 'int') or (cc_id[1] == 'float'):
                 setattr(Books, 'custom_column_' + str(cc_id[0]), relationship(cc_classes[cc_id[0]],
                                                                            primaryjoin=(
                                                                            Books.id == cc_classes[cc_id[0]].book),

cps/editbooks.py

@@ -175,7 +175,7 @@ def delete_book(book_id, book_format):
                     cc_string = "custom_column_" + str(c.id)
                     if not c.is_multiple:
                         if len(getattr(book, cc_string)) > 0:
-                            if c.datatype == 'bool' or c.datatype == 'integer':
+                            if c.datatype == 'bool' or c.datatype == 'integer' or c.datatype == 'float':
                                 del_cc = getattr(book, cc_string)[0]
                                 getattr(book, cc_string).remove(del_cc)
                                 db.session.delete(del_cc)
@@ -254,7 +254,7 @@ def edit_cc_data(book_id, book, to_save):
             else:
                 cc_db_value = None
             if to_save[cc_string].strip():
-                if c.datatype == 'int' or c.datatype == 'bool':
+                if c.datatype == 'int' or c.datatype == 'bool' or c.datatype == 'float':
                     if to_save[cc_string] == 'None':
                         to_save[cc_string] = None
                     elif c.datatype == 'bool':

cps/templates/book_edit.html

@@ -113,8 +113,8 @@
               </select>
             {% endif %}
 
-            {% if c.datatype == 'int' %}
+            {% if c.datatype == 'int' or c.datatype == 'float' %}
-              <input type="number" step="1" class="form-control" name="{{ 'custom_column_' ~ c.id }}" id="{{ 'custom_column_' ~ c.id }}" value="{% if book['custom_column_' ~ c.id]|length > 0 %}{{ book['custom_column_' ~ c.id][0].value }}{% endif %}">
+	    <input type="number" step="{% if c.datatype == 'float' %}0.01{% else %}1{% endif %}" class="form-control" name="{{ 'custom_column_' ~ c.id }}" id="{{ 'custom_column_' ~ c.id }}" value="{% if book['custom_column_' ~ c.id]|length > 0 %}{{ book['custom_column_' ~ c.id][0].value }}{% endif %}">
             {% endif %}
 
             {% if c.datatype in ['text', 'series'] and not c.is_multiple %}