With qry_funs

This function evaluates whatever code you pass to it in the environment of the qry_funs list. This allows you to cut down on typing when writing your queries. If you want to cut down on typing even more, you can try assigning the qry_funs list into your global environment with: list2env(qry_funs, envir = globalenv()).

Usage

with_qfuns(code, envir = parent.frame())

Arguments

code

Code to evaluate. See example.

envir

Where should R look for objects present in code that aren't present in qry_funs.

Value

The result of code - i.e., your query.

Examples

# Without with_qfuns, we have to do:
qry_funs$and(
  qry_funs$gte(patent_date = "2007-01-01"),
  qry_funs$text_phrase(patent_abstract = c("computer program")),
  qry_funs$or(
    qry_funs$eq(inventor_last_name = "ihaka"),
    qry_funs$eq(inventor_first_name = "chris")
  )
)
#> {"_and":[{"_gte":{"patent_date":"2007-01-01"}},{"_text_phrase":{"patent_abstract":"computer program"}},{"_or":[{"_eq":{"inventor_last_name":"ihaka"}},{"_eq":{"inventor_first_name":"chris"}}]}]}

#...With it, this becomes:
with_qfuns(
 and(
   gte(patent_date = "2007-01-01"),
   text_phrase(patent_abstract = c("computer program")),
   or(
     eq(inventor_last_name = "ihaka"),
     eq(inventor_first_name = "chris")
   )
 )
)
#> {"_and":[{"_gte":{"patent_date":"2007-01-01"}},{"_text_phrase":{"patent_abstract":"computer program"}},{"_or":[{"_eq":{"inventor_last_name":"ihaka"}},{"_eq":{"inventor_first_name":"chris"}}]}]}