author | Sverre Rabbelier <srabbelier@gmail.com> |
Thu, 19 Mar 2009 23:25:34 +0000 | |
changeset 1942 | 832a1e80eee0 |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
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1 |
from django.core.management.base import NoArgsCommand, CommandError |
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2 |
|
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3 |
class Command(NoArgsCommand): |
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4 |
help = "Introspects the database tables in the given database and outputs a Django model module." |
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5 |
|
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6 |
requires_model_validation = False |
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7 |
|
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8 |
def handle_noargs(self, **options): |
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9 |
try: |
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10 |
for line in self.handle_inspection(): |
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11 |
print line |
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12 |
except NotImplementedError: |
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13 |
raise CommandError("Database inspection isn't supported for the currently selected database backend.") |
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14 |
|
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15 |
def handle_inspection(self): |
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16 |
from django.db import connection |
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17 |
import keyword |
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18 |
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19 |
table2model = lambda table_name: table_name.title().replace('_', '').replace(' ', '').replace('-', '') |
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20 |
|
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21 |
cursor = connection.cursor() |
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22 |
yield "# This is an auto-generated Django model module." |
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23 |
yield "# You'll have to do the following manually to clean this up:" |
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yield "# * Rearrange models' order" |
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25 |
yield "# * Make sure each model has one field with primary_key=True" |
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26 |
yield "# Feel free to rename the models, but don't rename db_table values or field names." |
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27 |
yield "#" |
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28 |
yield "# Also note: You'll have to insert the output of 'django-admin.py sqlcustom [appname]'" |
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29 |
yield "# into your database." |
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30 |
yield '' |
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31 |
yield 'from django.db import models' |
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32 |
yield '' |
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33 |
for table_name in connection.introspection.get_table_list(cursor): |
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34 |
yield 'class %s(models.Model):' % table2model(table_name) |
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35 |
try: |
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36 |
relations = connection.introspection.get_relations(cursor, table_name) |
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37 |
except NotImplementedError: |
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38 |
relations = {} |
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39 |
try: |
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40 |
indexes = connection.introspection.get_indexes(cursor, table_name) |
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41 |
except NotImplementedError: |
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42 |
indexes = {} |
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43 |
for i, row in enumerate(connection.introspection.get_table_description(cursor, table_name)): |
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44 |
column_name = row[0] |
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45 |
att_name = column_name.lower() |
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46 |
comment_notes = [] # Holds Field notes, to be displayed in a Python comment. |
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47 |
extra_params = {} # Holds Field parameters such as 'db_column'. |
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48 |
|
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49 |
# If the column name can't be used verbatim as a Python |
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50 |
# attribute, set the "db_column" for this Field. |
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51 |
if ' ' in att_name or '-' in att_name or keyword.iskeyword(att_name) or column_name != att_name: |
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52 |
extra_params['db_column'] = column_name |
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53 |
|
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54 |
# Modify the field name to make it Python-compatible. |
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55 |
if ' ' in att_name: |
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56 |
att_name = att_name.replace(' ', '_') |
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57 |
comment_notes.append('Field renamed to remove spaces.') |
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58 |
if '-' in att_name: |
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59 |
att_name = att_name.replace('-', '_') |
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60 |
comment_notes.append('Field renamed to remove dashes.') |
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61 |
if keyword.iskeyword(att_name): |
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62 |
att_name += '_field' |
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63 |
comment_notes.append('Field renamed because it was a Python reserved word.') |
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64 |
if column_name != att_name: |
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65 |
comment_notes.append('Field name made lowercase.') |
54
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66 |
|
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67 |
if i in relations: |
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68 |
rel_to = relations[i][1] == table_name and "'self'" or table2model(relations[i][1]) |
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69 |
field_type = 'ForeignKey(%s' % rel_to |
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70 |
if att_name.endswith('_id'): |
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71 |
att_name = att_name[:-3] |
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72 |
else: |
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73 |
extra_params['db_column'] = column_name |
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74 |
else: |
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75 |
try: |
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76 |
field_type = connection.introspection.data_types_reverse[row[1]] |
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77 |
except KeyError: |
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78 |
field_type = 'TextField' |
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79 |
comment_notes.append('This field type is a guess.') |
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80 |
|
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81 |
# This is a hook for DATA_TYPES_REVERSE to return a tuple of |
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82 |
# (field_type, extra_params_dict). |
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83 |
if type(field_type) is tuple: |
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84 |
field_type, new_params = field_type |
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85 |
extra_params.update(new_params) |
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86 |
|
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87 |
# Add max_length for all CharFields. |
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88 |
if field_type == 'CharField' and row[3]: |
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89 |
extra_params['max_length'] = row[3] |
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90 |
|
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91 |
if field_type == 'DecimalField': |
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92 |
extra_params['max_digits'] = row[4] |
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93 |
extra_params['decimal_places'] = row[5] |
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94 |
|
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95 |
# Add primary_key and unique, if necessary. |
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96 |
if column_name in indexes: |
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97 |
if indexes[column_name]['primary_key']: |
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98 |
extra_params['primary_key'] = True |
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99 |
elif indexes[column_name]['unique']: |
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100 |
extra_params['unique'] = True |
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101 |
|
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102 |
field_type += '(' |
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103 |
|
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104 |
# Don't output 'id = meta.AutoField(primary_key=True)', because |
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105 |
# that's assumed if it doesn't exist. |
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106 |
if att_name == 'id' and field_type == 'AutoField(' and extra_params == {'primary_key': True}: |
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107 |
continue |
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108 |
|
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109 |
# Add 'null' and 'blank', if the 'null_ok' flag was present in the |
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parents:
diff
changeset
|
110 |
# table description. |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
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changeset
|
111 |
if row[6]: # If it's NULL... |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
112 |
extra_params['blank'] = True |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
113 |
if not field_type in ('TextField(', 'CharField('): |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
114 |
extra_params['null'] = True |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
115 |
|
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
116 |
field_desc = '%s = models.%s' % (att_name, field_type) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
117 |
if extra_params: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
118 |
if not field_desc.endswith('('): |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
119 |
field_desc += ', ' |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
120 |
field_desc += ', '.join(['%s=%r' % (k, v) for k, v in extra_params.items()]) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
121 |
field_desc += ')' |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
122 |
if comment_notes: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
123 |
field_desc += ' # ' + ' '.join(comment_notes) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
124 |
yield ' %s' % field_desc |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
125 |
yield ' class Meta:' |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
126 |
yield ' db_table = %r' % table_name |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
127 |
yield '' |