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annotate planemo/lib/python3.7/site-packages/boto/dynamodb2/fields.py @ 0:d30785e31577 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:18:57 -0400
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1 from boto.dynamodb2.types import STRING
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2
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3
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4 class BaseSchemaField(object):
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5 """
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6 An abstract class for defining schema fields.
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7
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8 Contains most of the core functionality for the field. Subclasses must
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9 define an ``attr_type`` to pass to DynamoDB.
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10 """
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11 attr_type = None
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12
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13 def __init__(self, name, data_type=STRING):
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14 """
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15 Creates a Python schema field, to represent the data to pass to
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16 DynamoDB.
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17
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18 Requires a ``name`` parameter, which should be a string name of the
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19 field.
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20
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21 Optionally accepts a ``data_type`` parameter, which should be a
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22 constant from ``boto.dynamodb2.types``. (Default: ``STRING``)
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23 """
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24 self.name = name
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25 self.data_type = data_type
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26
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27 def definition(self):
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28 """
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29 Returns the attribute definition structure DynamoDB expects.
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30
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31 Example::
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32
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33 >>> field.definition()
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34 {
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35 'AttributeName': 'username',
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36 'AttributeType': 'S',
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37 }
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38
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39 """
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40 return {
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41 'AttributeName': self.name,
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42 'AttributeType': self.data_type,
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43 }
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44
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45 def schema(self):
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46 """
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47 Returns the schema structure DynamoDB expects.
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48
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49 Example::
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50
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51 >>> field.schema()
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52 {
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53 'AttributeName': 'username',
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54 'KeyType': 'HASH',
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55 }
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56
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57 """
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58 return {
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59 'AttributeName': self.name,
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60 'KeyType': self.attr_type,
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61 }
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62
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63
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64 class HashKey(BaseSchemaField):
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65 """
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66 An field representing a hash key.
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67
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68 Example::
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69
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70 >>> from boto.dynamodb2.types import NUMBER
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71 >>> HashKey('username')
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72 >>> HashKey('date_joined', data_type=NUMBER)
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73
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74 """
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75 attr_type = 'HASH'
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76
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77
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78 class RangeKey(BaseSchemaField):
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79 """
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80 An field representing a range key.
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81
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82 Example::
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83
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84 >>> from boto.dynamodb2.types import NUMBER
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85 >>> HashKey('username')
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86 >>> HashKey('date_joined', data_type=NUMBER)
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87
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88 """
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89 attr_type = 'RANGE'
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90
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91
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92 class BaseIndexField(object):
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93 """
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94 An abstract class for defining schema indexes.
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95
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96 Contains most of the core functionality for the index. Subclasses must
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97 define a ``projection_type`` to pass to DynamoDB.
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98 """
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99 def __init__(self, name, parts):
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100 self.name = name
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101 self.parts = parts
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102
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103 def definition(self):
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104 """
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105 Returns the attribute definition structure DynamoDB expects.
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106
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107 Example::
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108
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109 >>> index.definition()
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110 {
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111 'AttributeName': 'username',
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112 'AttributeType': 'S',
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113 }
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114
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115 """
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116 definition = []
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117
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118 for part in self.parts:
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119 definition.append({
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120 'AttributeName': part.name,
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121 'AttributeType': part.data_type,
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122 })
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123
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124 return definition
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125
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126 def schema(self):
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127 """
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128 Returns the schema structure DynamoDB expects.
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129
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130 Example::
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131
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132 >>> index.schema()
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133 {
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134 'IndexName': 'LastNameIndex',
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135 'KeySchema': [
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136 {
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137 'AttributeName': 'username',
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138 'KeyType': 'HASH',
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139 },
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140 ],
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141 'Projection': {
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142 'ProjectionType': 'KEYS_ONLY',
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143 }
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144 }
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145
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146 """
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147 key_schema = []
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148
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149 for part in self.parts:
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150 key_schema.append(part.schema())
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151
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152 return {
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153 'IndexName': self.name,
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154 'KeySchema': key_schema,
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155 'Projection': {
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156 'ProjectionType': self.projection_type,
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157 }
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158 }
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159
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160
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161 class AllIndex(BaseIndexField):
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162 """
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163 An index signifying all fields should be in the index.
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164
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165 Example::
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166
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167 >>> AllIndex('MostRecentlyJoined', parts=[
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168 ... HashKey('username'),
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169 ... RangeKey('date_joined')
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170 ... ])
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171
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172 """
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173 projection_type = 'ALL'
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174
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175
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176 class KeysOnlyIndex(BaseIndexField):
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177 """
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178 An index signifying only key fields should be in the index.
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179
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180 Example::
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181
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182 >>> KeysOnlyIndex('MostRecentlyJoined', parts=[
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183 ... HashKey('username'),
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184 ... RangeKey('date_joined')
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185 ... ])
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186
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187 """
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188 projection_type = 'KEYS_ONLY'
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189
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190
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191 class IncludeIndex(BaseIndexField):
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192 """
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193 An index signifying only certain fields should be in the index.
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194
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195 Example::
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196
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197 >>> IncludeIndex('GenderIndex', parts=[
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198 ... HashKey('username'),
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199 ... RangeKey('date_joined')
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200 ... ], includes=['gender'])
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201
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202 """
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203 projection_type = 'INCLUDE'
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204
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205 def __init__(self, *args, **kwargs):
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206 self.includes_fields = kwargs.pop('includes', [])
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207 super(IncludeIndex, self).__init__(*args, **kwargs)
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208
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209 def schema(self):
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210 schema_data = super(IncludeIndex, self).schema()
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211 schema_data['Projection']['NonKeyAttributes'] = self.includes_fields
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212 return schema_data
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213
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214
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215 class GlobalBaseIndexField(BaseIndexField):
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216 """
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217 An abstract class for defining global indexes.
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218
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219 Contains most of the core functionality for the index. Subclasses must
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220 define a ``projection_type`` to pass to DynamoDB.
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221 """
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222 throughput = {
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223 'read': 5,
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224 'write': 5,
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225 }
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226
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227 def __init__(self, *args, **kwargs):
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228 throughput = kwargs.pop('throughput', None)
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229
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230 if throughput is not None:
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231 self.throughput = throughput
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232
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233 super(GlobalBaseIndexField, self).__init__(*args, **kwargs)
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234
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235 def schema(self):
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236 """
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237 Returns the schema structure DynamoDB expects.
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238
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239 Example::
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240
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241 >>> index.schema()
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242 {
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243 'IndexName': 'LastNameIndex',
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244 'KeySchema': [
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245 {
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246 'AttributeName': 'username',
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247 'KeyType': 'HASH',
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248 },
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249 ],
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250 'Projection': {
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251 'ProjectionType': 'KEYS_ONLY',
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252 },
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253 'ProvisionedThroughput': {
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254 'ReadCapacityUnits': 5,
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255 'WriteCapacityUnits': 5
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256 }
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257 }
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258
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259 """
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260 schema_data = super(GlobalBaseIndexField, self).schema()
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261 schema_data['ProvisionedThroughput'] = {
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262 'ReadCapacityUnits': int(self.throughput['read']),
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263 'WriteCapacityUnits': int(self.throughput['write']),
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264 }
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265 return schema_data
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266
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267
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268 class GlobalAllIndex(GlobalBaseIndexField):
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269 """
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270 An index signifying all fields should be in the index.
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271
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272 Example::
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273
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274 >>> GlobalAllIndex('MostRecentlyJoined', parts=[
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275 ... HashKey('username'),
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276 ... RangeKey('date_joined')
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277 ... ],
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278 ... throughput={
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279 ... 'read': 2,
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280 ... 'write': 1,
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281 ... })
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282
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283 """
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284 projection_type = 'ALL'
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285
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286
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287 class GlobalKeysOnlyIndex(GlobalBaseIndexField):
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288 """
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289 An index signifying only key fields should be in the index.
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290
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291 Example::
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292
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293 >>> GlobalKeysOnlyIndex('MostRecentlyJoined', parts=[
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294 ... HashKey('username'),
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295 ... RangeKey('date_joined')
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296 ... ],
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297 ... throughput={
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298 ... 'read': 2,
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299 ... 'write': 1,
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300 ... })
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301
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302 """
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303 projection_type = 'KEYS_ONLY'
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304
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305
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306 class GlobalIncludeIndex(GlobalBaseIndexField, IncludeIndex):
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307 """
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308 An index signifying only certain fields should be in the index.
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309
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310 Example::
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311
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312 >>> GlobalIncludeIndex('GenderIndex', parts=[
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313 ... HashKey('username'),
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314 ... RangeKey('date_joined')
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315 ... ],
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316 ... includes=['gender'],
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317 ... throughput={
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318 ... 'read': 2,
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319 ... 'write': 1,
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320 ... })
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321
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322 """
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323 projection_type = 'INCLUDE'
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324
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325 def __init__(self, *args, **kwargs):
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326 throughput = kwargs.pop('throughput', None)
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327 IncludeIndex.__init__(self, *args, **kwargs)
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328 if throughput:
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329 kwargs['throughput'] = throughput
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330 GlobalBaseIndexField.__init__(self, *args, **kwargs)
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331
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332 def schema(self):
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333 # Pick up the includes.
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334 schema_data = IncludeIndex.schema(self)
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335 # Also the throughput.
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336 schema_data.update(GlobalBaseIndexField.schema(self))
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337 return schema_data