[Zope] Search a Catalog in Python

[Dragos Chirila]

Hi

I am doing something similarly.

    def __searchCatalog(self, p_criteria):
        """Search catalog"""
        return self.__catalog(p_criteria)

This returns a list of mybrains objects.

    def __getFoundObjects(self, p_list):
        """gets objects from catalog results"""
        return map(self.__catalog.getobject, map(getattr, p_list,
('data_record_id_',)*len(p_list)))

It gets a list of mybrains objects and returns a list of zope objects.

So, to search the catalog (in my case the __catalog is the ZCatalog
instance):

  results = self.__getFoundObjects(self.__catalog(filter))

The filter mut be a dictionary, something like: {'meta_type': 'File'}.

I think that you must write like:
     obj=self.Catalog('id':item}

if you want to search by id.

Hope this will help

Dragos


> Dear Zopers
>
> This time, I thought it should be simple, but I am struggling again:
> The idea was to search for items that have been catalogued successfully.
> In the Zope Book they describe how to do this using form and scripts.
> That works for me, too, but then I need to search in a regular Python
> program (An FS product).
> For this purpose, I found the ZCatalog.search method and gave it a try,
> but I cannot get it to work. It expects a dictionary, but what does that
> contain?
>
> Here is what I have so far:
>
>     __init__(self, id, title, ...):
>        ...
>         # add a Catalog
>         _catalog = ZCatalog('Catalog')
>
>         # add Metadata fields for the Catalog
>         _catalog.addColumn('id')
>         _catalog.addColumn('title')
>         _catalog.addColumn('icon')
>
>         # PathIndex
>         _catalog.addIndex('path_index', 'PathIndex')
>
>         # ZCTextIndex (with the required Lexicon)
>         class Extra:
>             """ Just a dummy to build records for the Lexicon.
>             """
>             pass
>         extra = Extra()
>         extra.index_type = 'Okapi BM25 Rank'
>         extra.lexicon_id = 'Lexicon'
>         _catalog._setObject('Lexicon', PLexicon('Lexicon', '',
> Splitter(), CaseNormalizer()))
>         _catalog.addIndex('title', 'ZCTextIndex', extra)
>
>         # FieldIndex
>         _catalog.addIndex('composer_first_name_index', 'FieldIndex',
> 'first_name')
>         _catalog.addIndex('composer_last_name_index', 'FieldIndex',
> 'last_name')
>         _catalog.addIndex('composer_year_of_birth_index', 'FieldIndex',
> 'year_of_birth')
>
>         self._setObject('Catalog', _catalog)
>
>         ...
>         # all new items get catalogued (verified) and now we should be
> able to search for them like this (???):
>
>         def searchForAnItem(item)
>             obj=self.Catalog(id={'query':[item]})
>
>
> What is wrong here? I feel very stupid again. Any help is appreciated!
>
> Thanks and kind regards
> Andre
>
>
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