Broken Thumbnails
Find images where thumbnail generation may have failed.
![](https://pydio.com/sites/default/files/git-importer/docs_cells_flows/images/1_preset_flows/capture-broken-thumbnails.png)
This flow looks up for image files that are missing the specific is_image
metadata and tries
to recreate the associated thumbnails.
This can be useful when something wrong happened at first thumbnail generation (at upload time).
How It Works
This is a good example of querying the search engine with a "FreeString". The default search here is using:
FreeString="-Meta.is_image:T* Extension:jpg Extension:jpeg Extension:png Extension:bmp"
A couple of interesting things here:
* Using Meta.{MetaName} to access the nodes internal metadata
* Prefixing search terms with + for "Must", - for "Must Not", nothing for "Should"
* Multiplying the Extension search term to load all files extensions
* Special value T*
means True
boolean fields
Finally, we search all files with jpg,jpeg,png,bmp extension that do not have the metadata "is_image".
Parameters
No parameters defined
Trigger Type
Manual
JSON Representation
{
"Label": "Broken Thumbnails",
"Owner": "pydio.system.user",
"Metadata": {
"Description": "Find images where thumbnail generation may have failed",
"Icon": "mdi mdi-image-broken",
"TplCategory": "content-processing",
"Usage": "This flow looks up for image files that are missing the specific `is_image` metadata and tries\nto recreate the associated thumbnails. \nThis can be useful when something wrong happened at first thumbnail generation (at upload time).\n\n### How It Works\n\nThis is a good example of querying the search engine with a \"FreeString\". The default search here is using: \n`FreeString=\"-Meta.is_image:T* Extension:jpg Extension:jpeg Extension:png Extension:bmp\"` \n\nA couple of interesting things here: \n * Using Meta.{MetaName} to access the nodes internal metadata\n * Prefixing search terms with + for \"Must\", - for \"Must Not\", nothing for \"Should\"\n * Multiplying the Extension search term to load all files extensions\n * Special value `T*` means `True` boolean fields \n \n Finally, we search all files with jpg,jpeg,png,bmp extension that do **not** have the metadata \"is_image\"."
},
"Actions": [
{
"ID": "actions.images.thumbnails",
"NodesSelector": {
"Query": {
"SubQueries": [
{
"type_url": "type.googleapis.com/tree.Query",
"value": "EAEwAUpLLU1ldGEuaXNfaW1hZ2U6VCogRXh0ZW5zaW9uOmpwZyBFeHRlbnNpb246anBlZyAgRXh0ZW5zaW9uOnBuZyBFeHRlbnNpb246Ym1w"
}
],
"Operation": 1
},
"Label": "Images w/o 'is_image' metadata"
}
}
]
}
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