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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">I am trying to use the OPTIMADE API implementation of COD, through the pymatgen’s OptimadeRester class. I just realized that the ‘next’ links that appear as responses do not conserve the queried response_fields.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">For example, from this query:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><a href="https://www.crystallography.net/cod/optimade/v1/structures?filter=(elements%20HAS%20ALL%20%22Co%22,%20%22Li%22,%20%22O%22)&response_fields=lattice_vectors,cartesian_site_positions,species,species_at_sites">https://www.crystallography.net/cod/optimade/v1/structures?filter=(elements%20HAS%20ALL%20%22Co%22,%20%22Li%22,%20%22O%22)&response_fields=lattice_vectors,cartesian_site_positions,species,species_at_sites</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The ‘next’ link is:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New",serif;color:black;mso-fareast-language:ES"><a href="https://www.crystallography.net/cod/optimade/v1.0.0/structures?page_limit=10&page_offset=10&filter=%28elements%20HAS%20ALL%20%22Co%22%2C%20%22Li%22%2C%20%22O%22%29"><span lang="EN-US">https://www.crystallography.net/cod/optimade/v1.0.0/structures?page_limit=10&page_offset=10&filter=%28elements%20HAS%20ALL%20%22Co%22%2C%20%22Li%22%2C%20%22O%22%29</span></a></span><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New",serif;color:black;mso-fareast-language:ES"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">And then when the OptimadeRester class tries to find the some of the response_fields, it fails, as they are no longer present in the response from the COD.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Is this a bug? Or is it a known thing in the implementation, for me it makes it much harder to keep the information consistent across pagination.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Oier.<o:p></o:p></span></p>
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